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Architecture Companies in Portsmouth: 115 Active Firms (2026)
Architecture companies in Portsmouth design buildings, advise on planning and construction, and operate within the city’s regulated professional-title market.
Buying centres in this market sit around property owners, developers, contractors and local public-sector estate teams that need planning support, technical drawings and construction-stage coordination. Portsmouth practices tend to serve residential, commercial, civic and mixed-use schemes rather than selling a repeatable product, so engagements are usually project-scoped and relationship-led. The sales motion is closer to professional services procurement than software-style subscription buying: references, planning experience, consultant networks and registered supervision matter. Smaller owner-led offices compete with mid-sized practices that can carry more of the design, documentation and project-management burden in-house.
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Portsmouth has 115 actively trading architecture companies in this cohort, giving the city a compact professional-services base rather than a broad national hub. Reported employment totals 268 people, which fits the pattern of lean practice teams, project-led resourcing and specialist subcontracting across the built-environment supply chain. The local list includes sole-practitioner and small-office models alongside a thinner group of larger practices, so capacity is likely to vary by project type, planning complexity and the need to coordinate with engineers, surveyors and contractors.
Architecture is structured around title protection, not a general licence for every building-design activity. The Architects Act restricts use of the architect title to registered individuals and sets conditions for firms and partnerships that trade under that description, including registered control or supervision. The Architects Registration Board is the statutory regulator for the register and title protection. RIBA sits in a different role as a professional body and source of practice and economics reporting. For buyers, that distinction matters: design capability, planning experience and project delivery still need separate diligence beyond the right to use the title.
The Portsmouth market appears likely to remain fragmented, with many practices operating around local referral networks, repeat property clients and contractor relationships. Demand tends to move with planning volumes, renovation budgets, public-sector estate work and wider construction confidence, so workloads can soften even when the professional base remains intact. Smaller practices may keep using specialist collaborators rather than building permanent multi-discipline teams. Fee pressure and procurement scrutiny are likely to favour firms that can show registered oversight, planning competence and reliable construction-stage coordination without carrying unnecessary overhead.
115
Active firms
2026
1
Above £5M turnover
14
Incorporated since 2022
Key facts
About 1% of the trading cohort reports turnover above £5M (1 of 115 firms) — the rest sits below that revenue band.
12% of the cohort was incorporated since 2022 (14 firms), so a sizeable share is in its first few filing cycles.
Under section 20 of the Architects Act 1997, use of a business name containing "architect" depends on meeting registration conditions.
The Architects Registration Board is the statutory regulator for the register and title protection, while RIBA is a professional body rather than the statutory regulator.
Official creative-industries estimates put creative industries at 5.5% of UK GVA in 2024, with Architecture growing by an estimated 6.8% between 2023 and 2024.
RIBA's Winter 2024/25 economics note described the construction sector as weak and architects as still pessimistic about future workloads at the end of 2024.
A 2024 European sector study reported around 580,000 architects across 30 European countries, up 8% over the past decade, and nearly 70% of architectural practices as solo operations.
Top Portsmouth Architecture companies
James Potter Associates Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides architectural design services for residential building projects, including concept design, preparation of planning applications, and production of technical drawings and construction…
Serves private homeowners and residential property owners in the Portsmouth area, including households planning substantial home alterations, extensions or new residential projects, plus appointed…
Financial Health
StrongStrong · Hiring · 11% CAGR over 4y
Location
HRP ARCHITECTS LIMITED
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsProvides architectural design and planning services for residential and mixed-use building projects, including new builds, extensions, and redevelopment schemes, with project portfolio showcasing…
Serves homeowners, property owners and small developers seeking architects for residential extensions, conversions and development projects, mainly around Portsmouth, Hampshire and nearby areas.
Financial Health
WeakWeak · 0% CAGR over 5y
Location
ECA ARCHITECTURE LIMITED
Trajectory
4y · 2020–NowFinancial sub-scores
Computed from 4 filingsProvides architectural design and town planning consultancy services for residential and community developments. Prepares planning applications, neighbourhood planning strategies, and designs…
Serves private clients, property developers, community groups and built-environment stakeholders involved in residential, community-led and sustainable development projects.
Financial Health
DistressedDistressed
Location
Archiplus Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
CREATE ARCHITECTURAL & DESIGN SERVICES LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
StableStable · 0% CAGR over 2y
Location
Mcandrew Martin
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides built environment consultancy including architecture, engineering, surveying and project management. Designs and delivers secure design‑and‑build projects and infrastructure for government…
Serves government, defence and private-sector industry clients operating in highly secure or assured environments, including UK and international public-sector bodies and contractors.
Financial Health
StrongStrong · Hiring · 15% CAGR over 2y
Location
STUDIO 22:22 LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
PRITCHARD ARCHITECTURE LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides architectural design services focused on heritage conservation, building conversions, and new-build projects. Works on restoring and adapting historic and listed buildings, developing…
Serves public bodies, heritage trusts, cultural institutions and private-sector property owners with listed buildings, conservation sites, regeneration schemes and projects in historic contexts.
Financial Health
StrongStrong · Hiring · 13% CAGR over 4y
Location
Steve Terry Architects Limited
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
Thorns Young Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides residential architectural design and building surveying services, producing plans for home extensions, conversions and renovations. Prepares planning applications, building regulations…
Serves B2C domestic clients, primarily homeowners and residential property owners seeking support for house extensions, conversions and renovations, with some interaction with builders and local…
Financial Health
DistressedDistressed · -14% CAGR over 4y
Location
Neoptera Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · -16% CAGR over 4y
Location
EKO ASSOCIATES LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
Location
ARCHI+BUILD LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · 0% CAGR over 4y
Location
JCSE Design (Chichester) Limited
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides property development and real estate consultancy services, including planning consultancy, architectural design, land and property acquisitions and sales, and asset management. Manages…
Serves property owners, landowners, developers and high-net-worth investors seeking to unlock or redevelop real estate assets, alongside engagement with local communities, businesses and stakeholders…
Financial Health
HealthyHealthy · 0% CAGR over 1y
Location
ATP Design Ltd
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsFinancial Health
WeakWeak · 0% CAGR over 3y
Location
NH Architects Limited
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
StableStable · 0% CAGR over 1y
Location
SLA Quantity Surveying Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable · 0% CAGR over 4y
Location
HGP ARCHITECTS LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides architectural design and planning services for residential, commercial and mixed‑use developments. Offers concept design, technical design and project coordination, working with developers…
Serves B2B clients including property developers, hotel and leisure operators, housebuilders, regeneration projects and specialist organisations, with an emphasis on South Coast projects.
Financial Health
WeakWeak · -3% CAGR over 2y
Location
STONE ASSOCIATES LTD
Trajectory
5y · 2021–NowProvides architectural design services including concept design, planning applications, project management and contract administration for residential and commercial building projects, along with…
Financial Health
Insufficient historyInsufficient history
Location
Critchley Architecture And Design Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides architectural design and planning services, including feasibility studies, concept design, planning applications, and construction drawings and specifications. Works on residential…
Serves a mix of B2C and B2B clients: homeowners, property developers, commercial and industrial organisations, and heritage property owners across the UK and south of England.
Financial Health
StableStable · -10% CAGR over 4y
Location
HEBDEN DESIGN STUDIO LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides architectural design, town planning consultancy, interior design and project management services for residential, commercial and heritage building projects, including sustainable building…
Serves residential property owners, commercial clients, developers and custodians of historic buildings across West Sussex, East Sussex, Hampshire, Guildford and London.
Financial Health
StrongStrong · Hiring · 32% CAGR over 4y
Location
CASERTA INVESTMENTS LIMITED
Trajectory
4y · 2022–NowFinancial sub-scores
Computed from 4 filingsProvides architectural design and planning consultancy for residential projects, including extensions and new-build homes. Also conducts RICS property surveys, valuations, building regulations…
Serves homeowners, home buyers, custodians of listed buildings, and small property developers in Hampshire and nearby Surrey needing residential property, planning, surveying, valuation and boundary…
Financial Health
HealthyHealthy · 0% CAGR over 3y
Location
Exdell Limited
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
StableStable
Location
Jon Tyrrell Studio Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsFinancial Health
HealthyHealthy
Location
ADP ARCHITECTS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides architectural design services including architecture, interior design, masterplanning, and heritage consultancy. Works on projects across sectors such as residential, healthcare, education,…
Serves public and private-sector clients in healthcare, higher education, schools and FE, culture and community, residential, hospitality, leisure and workplace sectors.
Financial Health
StrongStrong · Growing · 0% CAGR over 4y
Location
A2 - Architecture & Development Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides architectural services including masterplanning, urban design and design development for large-scale residential and mixed‑use schemes. Works with property developers on concept design,…
Serves property developers of all scales across the UK, particularly those planning large-scale residential, masterplanning, urban development, infill or regeneration schemes.
Financial Health
StrongStrong · Hiring · 28% CAGR over 4y
Location
MARTIN RALPH PROPERTIES LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides property consultancy services including surveying, architectural design, mechanical and electrical engineering, and sustainability advice. Supports refurbishment and new-build projects,…
Serves individuals needing domestic property advice, central government and defence clients, FM companies, local authorities, healthcare, housing, industrial, leisure, licensed premises, listed…
Financial Health
HealthyHealthy · 0% CAGR over 2y
Location
IAN KNIGHT CONSULTING LIMITED
Trajectory
5y · 2021–NowProvides architectural technology and surveying services including site surveys, planning application drawings, technical design, and construction plans for commercial, retail, industrial,…
Serves commercial, retail, industrial and residential property clients, including businesses, developers, homeowners and project teams needing architectural technology input for building and planning…
Financial Health
Insufficient historyInsufficient history
Location
VIBE BUSINESS INTERIORS LIMITED
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsProvides commercial office design and interior fit-out services, including workplace refurbishment, tenant and landlord fit-outs, office relocations, and furniture design and installation for…
Serves B2B customers on the South Coast, including businesses occupying or moving offices, commercial tenants, and landlords or property owners managing office space.
Financial Health
StrongStrong · Hiring · 19% CAGR over 4y
Location
2D Plan Store Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
Plum Architects Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · -10% CAGR over 4y
Location
Bird And Macdonald Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable
Location
Helyer Davies Architects Ltd
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides architectural and interior design services for residential projects, designing bespoke homes and living spaces. Works with clients from concept through planning and construction to deliver…
Serves private residential clients and homeowners commissioning bespoke home projects in coastal, town and rural settings, particularly across Hampshire, West Sussex and the south coast.
Financial Health
StableStable · -5% CAGR over 2y
Location
Onesta Associates Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
EXLEY DESIGN & PLANNING LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
Location
NAK DESIGN LTD
Trajectory
1y · 2025–NowFinancial Health
Insufficient historyInsufficient history
Location
Trajectory
5y · 2019–NowFinancial sub-scores
Computed from 5 filingsProvides workplace strategy, office design and architecture services, with in‑house project management for office fit‑out, refurbishment and relocation projects. Also conducts property evaluation and…
Serves businesses and organisations planning office workspace changes, including corporate office occupiers in finance, gaming, publishing, telecoms and property across London and the South.
Financial Health
DistressedDistressed
Location
WILLIAM MARTIN DEVELOPMENTS LTD
Trajectory
3y · 2023–NowFinancial sub-scores
Computed from 3 filingsProvides property and construction consultancy services including building surveying, quantity surveying, architecture, project management and project monitoring. Also advises on party wall matters,…
Serves private and commercial property clients, developers, public authorities and charities across the UK, including customers in education, health and care, housing, leisure, retail, public…
Financial Health
StableStable · -29% CAGR over 2y
Location
KSA Architects Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
HealthyHealthy · Hiring · 4% CAGR over 4y
Location
Aro Design Ltd
Trajectory
1y · 2025–NowFinancial Health
Insufficient historyInsufficient history
Location
RS Architecture Limited
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
StableStable
Location
M-W-ARCHITECTURAL LTD
Trajectory
2y · 2024–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
WeakWeak · 0% CAGR over 1y
Location
Suzie Bridges Architects Ltd
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
WeakWeak · 0% CAGR over 4y
Location
Hampshire Design Consultancy Ltd.
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
Location
Dwelling Architects Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
Location
PARKERS DESIGN (SOUTHERN) LIMITED
Trajectory
2y · 2023–NowFinancial sub-scores
Computed from 2 filingsFinancial Health
WeakWeak · Hiring · 50% CAGR over 1y
Location
ALLENCREST LIMITED
Trajectory
5y · 2022–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · -68% CAGR over 4y
Location
MD DESIGN (SOUTHERN) LTD
Trajectory
5y · 2021–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed · 0% CAGR over 4y
Location
Southern Projects Limited
Trajectory
1y · 2025–NowProvides retail and commercial design and construction services, including store layout planning, pharmacy and clinic design, restaurant and grocery interiors, custom millwork, and full project…
Serves B2B commercial and retail clients, including pharmacies, medical clinics, grocery stores, restaurants and other retailers planning new sites, remodels or tenant improvements.
Financial Health
Insufficient historyInsufficient history
Location
Abacus Energy (Uk) Ltd
Trajectory
5y · 2020–NowFinancial sub-scores
Computed from 5 filingsFinancial Health
DistressedDistressed
Location
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How Portsmouth Architecture companies work and how to sell to them
What they do
Portsmouth architecture practices earn revenue from staged professional fees rather than repeatable product sales. Work typically starts with feasibility, concept design and planning support, then moves into technical drawings, tender packs and construction-stage coordination where the appointment is broader. Fees are usually fixed by stage, charged hourly for advisory work, or set as a share of construction value where the client wants design input through delivery. Some sell narrow planning packages, measured surveys and drawing production; others carry more of the consultant coordination burden. Revenue is lumpy because it follows project starts, approvals and client funding, so pipeline discipline and cash collection matter more than subscription renewal.
Who they sell to
Most sell to property owners, developers, contractors and public-sector estate teams, with decision-making split between owners, development managers, project managers, procurement officers, finance directors and construction leads. Straightforward residential or small commercial work may be bought through referral and a short proposal process, while civic or mixed-use schemes tend to involve longer qualification, references, consultant-team formation and formal tendering. Contract scope varies by stage: a client may first buy a planning package, then extend the appointment if consent, funding and contractor selection progress. Public-sector buyers usually ask for more evidence around registered supervision, insurance, delivery method and prior work on comparable schemes.
What they buy
Most architecture firms tend to spend on practice-management software, time recording, project accounting, billing, CRM, proposal production, document control and design collaboration tools. Design teams also need building information modelling, CAD, specification-writing, visualisation, cloud storage, cyber security, workstation support and large-format printing where drawings still move in physical form. Services spend often sits around professional indemnity insurance, legal support for appointments and collateral warranties, accounting, payroll, recruitment, bid writing and local marketing. Smaller practices may buy fractional finance, outsourced IT and freelance technical support because permanent operations headcount is hard to justify between projects. Larger practices are more likely to formalise systems for utilisation, project margins and document governance.
Why and how to sell to them
Architecture buyers tend to evaluate vendors when a practice moves from owner-led delivery to a team model, wins larger schemes, joins a public-sector tender route, hires technical staff or starts losing margin through rework and unpaid scope creep. Other triggers include leadership change, a new studio, a professional indemnity renewal, planning delays, document-version issues, or pressure from clients and contractors for clearer coordination. Outbound works better when it links to billable time, risk control, fee recovery and evidence for procurement, rather than a generic efficiency claim. Relevant angles include cleaner handover between design stages, fewer late drawing changes, easier cash collection and better visibility of project profitability.
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 Portsmouth
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Frequently asked questions
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