Modular Construction Companies in London: 67 Active Firms (2026)
Modular construction companies design, manufacture and assemble building components off site for projects across London.
Buying centres sit mainly with development, construction and estates teams rather than generic facilities procurement. London demand tends to come from housing providers, developers, main contractors and owners of education, healthcare and commercial estates, with suppliers pulled in to reduce site labour and programme risk. Engagements are usually project-led: panelised systems, volumetric modules or prefabricated assemblies are specified alongside design coordination, manufacture, logistics and installation. The buyer therefore looks for evidence of repeatable factory process, site interface discipline and capacity to work through subcontracted delivery chains.
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London has 67 trading companies in this list, so the visible cohort is compact rather than a broad contractor universe. Reported employment totals 235 people, which points to a market made up largely of specialist teams, project managers and installation coordinators rather than large factory employers inside the capital. The company base appears weighted towards suppliers serving developers, contractors and public-sector project owners from borough-level or near-London service bases, with headcount likely supplemented by subcontracted manufacture, logistics and site labour where schemes require it.
Projects usually pass through local planning consent, building-control approval, warranty acceptance and contractor procurement gates before factory production can convert into installed revenue. In London, that sequence matters because offsite suppliers often sell into developers, housing providers and public-sector owners rather than direct to occupiers. Specification can be decided early by architects and main contractors, while payment risk remains tied to site progress and acceptance of delivered assemblies. Fire safety, structural certification, transport logistics and interface risk with traditional trades tend to shape who is shortlisted for larger schemes.
Demand appears most durable where modular suppliers can remove site constraints for repeatable asset types, rather than where offsite methods are sold as a generic construction shortcut. The cohort’s lean operating shape suggests a market with many specialist subcontractor models and a thinner layer of scaled factory capacity. Buyers are likely to keep favouring firms that can prove design coordination, compliance discipline and installation reliability. Consolidation may come through project partners folding design, manufacture and site delivery into fewer commercial handoffs.
What’s in the file
One row per company, 50+ columns — everything below plus each company’s verified directors, from Companies House filings.
Company data
Verified directors — included
67
Active firms
2026
7
Above £5M
reported revenue
7
New incorporations
since 2022
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Key facts
About 10% of the trading cohort reports turnover above £5M (7 of 67 firms) — the rest sits below that revenue band.
10% of the cohort was incorporated since 2022 (7 firms), so a sizeable share is in its first few filing cycles.
Modular construction firms design, manufacture and assemble building components off site before installation on London projects.
The model shifts part of the build process into controlled manufacturing and assembly settings, away from project sites.
Buyer interest is linked to housing delivery, public-sector estate work and fit-out programmes where shorter site time can change project economics.
Top London Modular Construction companies
Financial sub-scores
Computed from 4 filingsDevelops residential apartments by building additional storeys on existing buildings through airspace development. Evaluates rooftop development potential, manages design and planning, and delivers…
Sells to property owners and asset holders in London, including private freeholders, enfranchised leaseholders, local authorities, housing associations, asset managers and retailers, and also markets…
Financial Health
DistressedDistressed · -27% CAGR over 3y
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Computed from 5 filingsDesigns and manufactures modular, factory-built housing units and provides turnkey installation. Develops low‑energy homes that can be installed on underused sites such as car parks, rooftops,…
Serves local authorities, housing associations, healthcare authorities, education bodies, private developers and car park or brownfield-site owners seeking affordable housing schemes for key workers,…
Financial Health
StrongStrong · Hiring · 26% CAGR over 4y
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Computed from 5 filingsDesigns, manufactures and constructs modular building facilities using offsite manufacturing. Produces prefabricated systems such as FLEXI POD and UltraPOD and provides design, engineering,…
Sells primarily to B2B and public sector buyers needing specialist facilities, especially healthcare, life sciences, semiconductor and education organisations seeking fixed-cost, fast-track…
Financial Health
StableStable · -5% CAGR over 4y
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Computed from 5 filingsDesigns, manufactures and installs structural insulated panel (SIP) building systems for residential construction. Provides off‑site manufactured load‑bearing panels, with associated design, delivery…
Sells to property developers, housing associations and local authorities planning low-carbon residential schemes, from small developments to large-scale housing projects.
Financial Health
StableStable · -76% CAGR over 4y
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Computed from 5 filingsDesigns and manufactures structural insulated panel (SIP) building systems and provides design, off‑site manufacturing, delivery and installation services. Supplies panellised construction systems…
Serves residential property developers, housing associations and local authorities seeking low-carbon, net zero-ready housing schemes, from small projects to larger developments.
Financial Health
WeakWeak · -74% CAGR over 4y
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Develops modular construction technology and delivers turnkey housing projects using prefabricated wall systems produced in automated factories. Provides rapid-build residential buildings such as…
Serves public and private sector housing developers, governments, NGOs and community housing providers needing rapid, sustainable residential developments, from social housing schemes to apartment…
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Computed from 5 filingsProvides hire and sales of portable cabins and modular buildings, including plastisol and anti‑vandal units. Designs, manufactures, refurbishes and installs bespoke or recycled modular structures,…
Serves B2B and public-sector buyers, including NHS and healthcare bodies, schools and education providers, construction firms, commercial organisations, and nurseries requiring cabin or modular…
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WeakWeak · 0% CAGR over 4y
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Computed from 5 filingsDesigns, manufactures and constructs timber frame structures for residential housing and apartment developments. Provides timber engineering, design support, and installation services for bespoke…
Serves major national contractors and residential property developers delivering complex housing, apartment and care schemes, as well as private clients commissioning one-off bespoke homes.
Financial Health
DistressedDistressed
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Computed from 5 filingsDesigns, manufactures and supplies light gauge steel frame (LGSF) structural systems for residential and building projects. Produces off‑site fabricated steel frame components and provides delivery,…
Serves property developers, housebuilders, main contractors, architects and self-build clients planning residential or light commercial building projects across the country.
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HealthyHealthy
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Designs, manufactures and delivers buildings using industrialised and offsite construction methods. Provides modular facilities and infrastructure for sectors including defence, education,…
Serves public-sector and institutional buyers across defence, education, justice and healthcare, as well as residential organisations and clients needing hired modular space for living, learning or…
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Computed from 4 filingsDesigns and constructs modular buildings using repurposed shipping containers. Provides feasibility studies, architectural design, offsite fabrication and fit‑out, and on‑site installation for…
Serves commercial organisations, property developers and public sector bodies commissioning new building projects, including clients needing feasibility, design, fabrication, fit-out and installation…
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StrongStrong
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Computed from 3 filingsDesigns and manufactures flat-pack and modular steel buildings, including storage units, offices, accommodation cabins, kiosks and security boxes. Supplies portable structures such as chemical…
Serves construction and industrial firms, schools and colleges, property developers, visitor sites, security-focused organisations, and homeowners needing secure garden storage or temporary space.
Financial Health
StableStable · Hiring · 15% CAGR over 2y
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Computed from 4 filingsDesigns and constructs structural timber buildings and components, including glulam beams, SIP panel systems, timber frames and architectural cladding. Provides bespoke residential and commercial…
Serves a mix of B2B and B2C customers, including commercial property developers, architects, designers, and private residential clients commissioning bespoke timber structures, rooftop extensions,…
Financial Health
StableStable · Hiring · 40% CAGR over 3y
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Computed from 5 filingsDevelops and constructs residential and mixed‑use real estate projects using volumetric off‑site construction methods. Manages site acquisition, planning and project delivery for schemes including…
Targets B2B real estate investors, developers, clients and strategic partners commissioning large-scale urban projects, especially student accommodation, residential, hotel, co-living, build-to-rent…
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StableStable · 0% CAGR over 4y
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Computed from 5 filingsProperty development and construction company specialising in airspace and rooftop projects, converting unused roof space above existing buildings into residential penthouse apartments. Provides…
Targets London freeholders, landlords, managing agents and property owners with buildings that have unused roof space, plus property partners seeking airspace or rooftop development opportunities.
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StrongStrong
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Designs, supplies and constructs structural timber systems and buildings, including glulam beams, timber frames, SIP panels and architectural cladding. Provides off‑site fabricated timber structures…
Serves residential self-builders, homeowners, commercial property owners and developers, as well as architects and designers seeking bespoke timber-led buildings, extensions and interiors.
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N/AN/A
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Computed from 5 filingsDesigns and manufactures cold‑formed steel building systems and components including metal studs, tracks, roof sheets, wall cladding and prefabricated panels, and provides engineering, prefabrication…
Serves construction businesses, developers and project owners delivering commercial, residential, modular housing and post-disaster building projects, including mid-size construction clients.
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HealthyHealthy · 0% CAGR over 4y
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Designs, manufactures and installs temporary, semi‑permanent and permanent modular buildings and industrial canopies. Provides insulated and uninsulated structures for warehousing, logistics, sports…
Serves B2B and public sector buyers across the UK and Ireland, including industrial, logistics, retail, sports and leisure, education, waste and recycling, aerospace, energy, and film and TV…
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Computed from 5 filingsSupplies and installs temporary, interim and permanent steel‑framed buildings for commercial and industrial use. Offers rental or purchase of modular structures such as warehouses, aircraft hangars,…
Serves UK businesses and public-sector organisations, including industrial, warehousing, automotive valeting, aviation, sports, education and emergency healthcare sites.
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StableStable · 1% CAGR over 4y
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Computed from 5 filingsDesigns, manufactures and installs prefabricated mass timber building envelope panel systems. Provides engineered, insulated and fire‑resistant panels for residential, commercial and industrial…
Serves building developers, architects and contractors delivering modern low-rise buildings, high-rise towers and large industrial complexes.
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WeakWeak · -68% CAGR over 4y
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Computed from 5 filingsProvides façade subcontracting services for construction projects, including design, manufacture, installation and maintenance of building envelope systems. Supplies aluminium windows and curtain…
Serves main contractors, property developers and construction project teams needing façade and building envelope subcontractors for commercial or residential developments.
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StrongStrong · Growing, Hiring · 9% CAGR over 4y
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Computed from 4 filingsDesigns and supplies prefabricated wall and ceiling systems for building construction, including party walls, internal walls, shaft walls, independent wall linings, wall liners and MF ceiling…
Serves construction contractors, developers and project teams working on residential and commercial building projects requiring wall, lining, shaftwall and ceiling systems.
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StableStable · -73% CAGR over 3y
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Computed from 5 filingsDesigns, supplies and installs temporary, interim and permanent steel‑framed buildings for commercial and industrial use, including warehouses, workshops, aircraft hangars and sports facilities,…
Serves UK businesses and public-sector organisations needing extra operational space, including warehouses, industrial sites, schools, healthcare providers, sports facilities, aircraft operators,…
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HealthyHealthy
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Provides on-site timber frame construction for residential buildings. Offers design and build contracts, fire boundary mitigation measures, and packages including insulation, stairs and cladding,…
Serves residential developers, self-build homeowners and construction professionals in South East England seeking timber-frame building packages and related project support.
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Computed from 3 filingsDesigns and supplies insulated panelised roof systems for residential construction, including gable-to-gable and eaves-to-ridge roof panels, spandrels and accessories used by housebuilders to create…
Serves UK house builders, residential developers and construction contractors delivering housing projects that include room-in-roof designs, from private developments to larger multi-site schemes.
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StrongStrong · Hiring · 22% CAGR over 2y
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Computed from 3 filingsDesigns, engineers and manufactures timber frame building systems for self-build homes and residential developments. Supplies house kits, standard and bespoke designs, and provides services including…
Serves UK self-builders planning bespoke homes, plus independent property developers, architects and construction companies involved in timber frame house, apartment, annexe or conversion projects.
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StableStable · -9% CAGR over 2y
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Computed from 5 filingsSupplies cross‑laminated timber (CLT) panels for construction and provides design, engineering, and technical support for timber building projects. Offers product specifications, structural and fire…
Serves architects, structural engineers, contractors, developers and public-sector project teams delivering residential, commercial, education, hospitality and civic building projects using…
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StableStable · -69% CAGR over 4y
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Computed from 5 filingsProvides design-build general contracting for residential, commercial, industrial and institutional projects. Offers modular construction systems, precast concrete and steel fabrication,…
Serves B2B and institutional clients, including property developers, affordable housing providers, commercial landlords, industrial operators and organisations commissioning parking, modular, solar…
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WeakWeak
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Computed from 5 filingsProvides insulating concrete formwork (ICF) building systems and technical support for construction projects, including homes, basements, extensions and commercial buildings, enabling…
Serves UK self-builders, architects, designers, residential developers and contractors working on homes, extensions, basements, apartments, offices, care homes, schools, community buildings,…
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Designs and supplies structural timber systems including glulam beams, SIP panels and architectural cladding, and provides design and construction of timber buildings, rooftop extensions and modular…
Serves architects, designers, property developers, commercial property owners and residential clients pursuing bespoke timber structures, rooftop extensions, interiors and high-end domestic or…
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Computed from 5 filingsDesigns, manufactures and installs precast concrete products for construction projects, including beam and block flooring, insulated flooring systems, hollowcore slabs, stairs, landings and lift…
Serves the UK construction industry, selling to housebuilders, main contractors, groundworkers, civil engineering contractors, builders’ merchants and self-builders, plus engineers, architects and…
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DistressedDistressed
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Computed from 3 filingsProvides main contractor construction services for residential, hotel, commercial and public buildings. Also manufactures modular structures offsite and supplies facade, cladding, window, mechanical…
Serves property developers, hotel operators, commercial landlords, public bodies and institutional clients commissioning hotels, residential schemes, high-end homes, cultural and religious centres,…
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StrongStrong · 0% CAGR over 1y
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Computed from 4 filingsDesigns and manufactures prefabricated modular buildings including office studio pods, bathroom pods, home gyms, garden suites and A‑frame kit structures. Produces steel frames and panelised…
Serves homeowners with urban or rural properties and commercial/industrial businesses commissioning bespoke modular spaces, including offices, bathrooms, gyms and garden suites.
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DistressedDistressed · -25% CAGR over 3y
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Computed from 5 filingsDesigns and manufactures public toilet facilities, including modular units and accessible Changing Places toilets. Provides installation, refurbishment, and operation and maintenance services for…
Serves local authorities, public-sector bodies and site operators responsible for public amenities in cities, parks, seaside resorts, airports, events and worksites, including buyers needing…
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HealthyHealthy · Growing · 0% CAGR over 4y
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Computed from 4 filingsManufactures precast concrete products for the construction industry, including hollowcore flooring, beam and block systems, precast stairs, lift shafts, and bespoke structural components. Supplies…
Serves B2B construction clients, including main contractors, developers and project teams delivering commercial, residential, education, healthcare, infrastructure, leisure and industrial builds…
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Computed from 5 filingsDesigns and supplies façade systems for buildings, including terracotta tile facades, brick slip fixing systems and metal façade components. Provides façade engineering, supply management, off‑site…
Serves B2B construction customers, including architects, facade contractors, developers and main contractors specifying or procuring terracotta, brick slip, metal and unitised facade systems for…
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HealthyHealthy · -4% CAGR over 4y
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Computed from 2 filingsManufactures and supplies steel structures and metal components for construction and infrastructure projects. Provides fabrication, engineering and assembly of structural steel, as well as modular…
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HealthyHealthy · Hiring · 27% CAGR over 1y
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Designs, manufactures and delivers modular and mobile hospital facilities, including permanent modular hospitals, field hospitals and trailer-based clinics. Provides planning, engineering,…
Serves Ministries of Health, national and regional healthcare systems, institutional developers and infrastructure investors seeking modular, mobile or field hospital infrastructure worldwide.
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Computed from 4 filingsSupplies and hires shipping containers, site accommodation units and modular buildings. Provides container sales, rental fleets, tailored container conversions, and turnkey site setup solutions for…
Serves B2B customers across the UK, including construction project teams, site managers, industrial operators and organisations requiring temporary site facilities, storage space or modular premises.
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WeakWeak · 0% CAGR over 3y
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Provides building services engineering including mechanical and electrical (M&E) installation, prefabricated modular M&E systems, and maintenance. Designs and installs security systems and software,…
Serves B2B clients across London and the South of England, including commercial property owners, developers, facilities managers, hotels, offices, venues, data centres and public-facing estates.
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Computed from 2 filingsDesigns, manufactures and installs bespoke modular garden buildings including garden rooms, garden offices and gyms. Also supplies structures such as aluminium pergolas, garden annexes, mobile homes,…
Serves UK homeowners seeking garden rooms, offices, gyms and annexes, plus organisations such as nurseries, schools, sports facilities, property teams, holiday parks and glamping operators needing…
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StableStable · 0% CAGR over 1y
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Computed from 5 filingsDesigns and manufactures precast concrete components for construction projects, including columns, beams, stairs, landings, solid and twin walls, and capping slabs. Produces standard and bespoke…
Serves B2B construction contractors, developers and project teams needing precast concrete elements for building projects, including stair cores, lift shafts and structural frames.
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Computed from 3 filingsDesigns and builds modular homes, manufacturing housing modules in a factory and delivering them for on‑site assembly. Offers floor plan selection, custom design options, and project management…
Serves B2C homebuyers and homeowners seeking modular homes, primarily through a retailer network, including customers selecting floor plans, budgets, options and custom designs.
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StrongStrong · Hiring · 82% CAGR over 2y
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Computed from 5 filingsManufactures precast concrete structural elements for construction, including pillars, columns, stairs, landings and twin wall units. Provides in‑house design, production and delivery of precast…
Serves construction-sector businesses, including developers and main contractors delivering RC frame, basement, high-rise and non-residential projects that need precast concrete elements supplied to…
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StableStable · -7% CAGR over 4y
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Provides design, manufacture and delivery of modular and mobile hospital facilities, including permanent modular hospitals, field hospitals, clinics and diagnostic units, offering turnkey healthcare…
Serves Ministries of Health, national and regional healthcare systems, institutional developers and infrastructure investors seeking hospital infrastructure for permanent, mobile, field or emergency…
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Computed from 3 filingsDesigns, manufactures and constructs prefabricated concrete basements and ground‑bearing slabs for residential building projects. Provides waterproofing systems, basement insulation, retaining walls…
Serves self-build homeowners, architects, property developers and landscapers planning residential basement, slab or retaining wall projects, including sites with challenging ground or water…
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StableStable · -10% CAGR over 2y
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Computed from 5 filingsSupplies new and used shipping containers for sale or hire, provides container-based self‑storage, and delivers modular buildings. Also converts containers into units such as offices, workshops, food…
Serves both businesses and consumers, including homeowners needing self-storage or temporary space and commercial customers across varied industries requiring containers, modular units or converted…
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Computed from 5 filingsDesigns, manufactures and installs modular buildings including public toilets, Changing Places facilities, kiosks and leisure buildings. Provides access control systems, coin‑operated entry and…
Serves public-sector bodies, especially local authorities, tourism departments, environmental groups and transport hubs across the UK and Ireland that manage public toilets, parks, recreation sites…
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DistressedDistressed · -66% CAGR over 4y
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Computed from 5 filingsDesigns, manufactures, supplies and installs modular architectural handrail and balustrade systems for residential and commercial construction projects, including steel panel and midrail systems used…
Serves B2B construction-sector clients, including developers, main contractors and architects working on commercial, residential, hotel and high-rise building projects, with a strong emphasis on…
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Computed from 4 filingsDesigns, manufactures and installs bespoke garden rooms and outdoor buildings for residential and commercial use, including garden offices, gyms, studios and annexes. Uses SIPs construction and…
Serves UK homeowners planning garden offices, gyms, studios, annexes or extensions, alongside commercial clients needing outdoor rooms or workspace for their premises.
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How London Modular Construction companies work and how to sell to them
What they do
Modular construction firms earn most of their revenue from project contracts, not recurring subscriptions. Income typically mixes early-stage design coordination, engineering input, factory manufacture, transport, installation and defect remediation, with margin depending on how much of that chain they control. Pricing is usually tied to tendered scopes, schedules of rates or negotiated design-and-build packages, with stage payments linked to design freeze, factory completion, delivery and site acceptance. For sales teams, the commercial unit is often a scheme or framework slot rather than a user seat, so pipeline timing follows planning, specification and contractor appointment cycles.
Who they sell to
Most firms sell into professional construction buying groups rather than end occupiers. Housing providers and developers tend to care about programme certainty and cost control; main contractors focus on buildability, interface risk and subcontractor reliability; education and healthcare estates teams add compliance and operational disruption to the brief. Decision-makers usually include development directors, construction directors, project managers, quantity surveyors, commercial managers and procurement teams, with architects and structural advisers influencing specification before formal tender. Sales cycles are often long because the offsite package must be fixed before manufacture, and routes to market usually combine direct relationship-building, consultant referral, framework participation and competitive tendering.
What they buy
Most modular construction firms tend to spend on systems that reduce coordination failure between design, factory and site. Common software needs include estimating, bid management, CRM, project accounting, document control, design coordination, scheduling, procurement and quality management. Firms with direct manufacturing capacity may also buy production planning, inventory control, equipment maintenance and health-and-safety tooling; subcontractor-led models usually need supplier management, logistics scheduling and proof-of-delivery workflows. External services often cover structural engineering support, fire and warranty documentation, construction law, insurance, finance, recruitment for technical project roles, and bid writing for public-sector or framework opportunities.
Why and how to sell to them
Modular construction buyers tend to evaluate vendors when a scheme moves from concept into detailed design, a framework place is won, a main-contractor relationship expands, or a firm starts carrying more manufacturing and installation risk itself. Pain points are practical: design changes after factory commitment, late approvals, cash tied up in work-in-progress, site-access constraints, certification evidence and coordination with traditional trades. Outbound messages are more credible when they attach to those moments, using language around programme assurance, margin protection, compliance evidence, payment milestones or subcontractor control. Generic productivity claims are less likely to land than a clear link to fewer redesign loops, cleaner handovers or faster tender response.
How this list is built
Data sources
This list is built from UK Companies House filings, XBRL accounts data, and semantic analysis of each company's public website. Revenue and headcount figures come from the most recent filed accounts; where the company has not filed, values are estimated using a model trained on filed history and peer benchmarks and are labelled as estimates.
Classification
Rather than relying solely on SIC codes, Firmbase classifies each company semantically: the company's website is crawled, an AI model reads what the company actually sells, and the company is placed into the relevant industry and subsectors. SIC codes are used as one signal but not the only one. This means a company that registered under a generic SIC code but pivoted into (for example) fintech is correctly identified as fintech, not as its original SIC category.
Freshness
The underlying company data is refreshed from Companies House continuously; filings appear in the list within days of submission. The curated list ordering is regenerated when the underlying data moves meaningfully (company count changes by more than 5%, a new company enters the top-ranked segment, or the filed-revenue numbers for the top firms change). You can see the last-updated timestamp near the top of the page.
Also in London
Related directories
Frequently asked questions
How many modular construction companies are there in London?
What counts as a modular construction company in this list?
Which are the largest modular construction companies in London?
What do modular construction companies in London actually do?
How does London modular construction compare internationally?
How is this list built and how fresh is the data?
How big are the typical modular construction companies in London?
Are these mostly new or established modular construction companies?
What SIC codes does this use?
What buying signals should I look for?
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