Home extensions
Concept, planning and technical design for rear, side or multi-storey extensions to existing homes.
Architects Portsmouth
Find architects in Portsmouth
Planning an extension, conversion, refurbishment or new design in Portsmouth? Describe the property, objectives and likely scope once, then compare architects who cover your area.
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Up to 3 local responses
You choose who to hire
Looking for an architect near you in Portsmouth?
Enter the postcode, property type and what you want to change. Mention conservation-area, listed-building or HMO use if relevant so suitable Portsmouth architects can judge the likely planning and design work.
Common architect services
What can architects in Portsmouth help with?
Choose a professional whose experience matches the scale and practical requirements of your job.
Renovations & remodelling
Reworking internal layouts, circulation and spaces while coordinating structural and building-services requirements.
Planning applications
Drawings and design information for projects that require planning permission or specific local assessment.
Building Regulations design
Technical information and coordination needed to demonstrate compliance with relevant Building Regulations.
Listed & heritage buildings
Design work where listed-building consent, conservation context and historic fabric need special attention.
New-build design
Concept through technical design for new homes and other buildings where site, planning and construction constraints are considered together.
How much does an architect cost?
Fees depend on project value, complexity and which RIBA-style stages or services are included. Current 2026 UK guidance gives these broad examples:
£3,000–£5,000Extension planning drawings
£2,000–£7,500+Renovation projects
£5,000–£8,000Building regs & tender drawings
£5,000–£12,000Full house-extension fee guide
Indicative UK guidance checked August 2026 from MyJobQuote. Portsmouth architect fees vary with project value, survey information, planning complexity, heritage, structural coordination and how far the architect remains involved after approval.
Compare like for like
Compare the same design stages
One fee may cover planning drawings only while another includes technical design, tendering and site support. Compare scope before comparing price.
- State the project budget and what you want to achieve, not only the room dimensions.
- Ask which design stages, applications and revisions are included.
- Clarify structural engineer, surveyor and specialist-consultant costs separately.
- For heritage property, mention listing or conservation-area status from the start.
Cost sources: MyJobQuote 2026 architect cost guide
Portsmouth planning and heritage context
Conservation areas and Portsmouth's HMO planning rules can materially change the design route
Portsmouth has many designated conservation areas and a tightly regulated HMO market. Planning permission and Building Regulations are also separate systems, so the exact property and intended use should be checked early.
New HMOs need both planning permission and a licence
Portsmouth City Council says a new HMO needs planning permission from the Planning Service and a licence from the Housing Service. If a design involves shared accommodation or a change of use, flag that intention at the briefing stage rather than treating it as an ordinary internal conversion.
Source: Portsmouth City Council — HMO planning permission and licensing requirements
Conservation areas can reduce normal permitted-development freedom
Portsmouth City Council says conservation-area designation affects demolition, extensions, trees and some external changes, with Article 4 Directions adding extra controls in some locations. An architect should therefore check the exact address before assuming a proposal is permitted development.
Local to Portsmouth
Architects covering Portsmouth
Architects may cover Portsmouth by project type, property and stage of work. Example areas include:
SouthseaFrattonCopnorNorth EndHilseaMiltonEastneyCosham
Give the exact address and intended use
The same extension or conversion can face different constraints in Old Portsmouth, Southsea, Eastney or a non-designated area. Share the address, existing plans and any known planning history.
Planning and Building Regulations are separate. A project may need planning permission, Building Regulations approval, both or neither. Ask the architect to explain which route applies to the proposed work.
How it works
Describe the project once, then compare Portsmouth architects
Budget, site, design ambition and required stages help architects decide whether the project fits their practice.
Set out the project brief
Add the postcode, property type, intended changes, budget and any known planning or heritage constraints.
Hear from suitable architects
Up to three interested Portsmouth architects can respond.
Compare service stages
Check relevant experience and compare exactly which surveys, drawings, applications and construction-stage services are included.
Before you hire
What should you check before hiring an architect?
Relevant project experience and a clearly defined service are more useful than comparing headline percentage fees alone.
Compare similar project experience
Look for work with a similar property type, planning context, budget and technical complexity.
Define the service stages
Agree whether the appointment stops at planning or continues through technical design, tender and construction support.
Clarify other consultants
Ask who appoints structural, measured-survey, party-wall or specialist consultants and whether their fees are separate.
Questions
Architects in Portsmouth: common questions
Useful answers before you post the job.
How much does an architect cost in Portsmouth?
Fees depend on project value, complexity and whether you need concept design, planning drawings, technical Building Regulations information, tender support or contract administration.
Do conservation areas affect extensions in Portsmouth?
They can. Conservation designation reduces some permitted-development freedoms and Article 4 Directions can add further controls in specific areas.
Does a new HMO need planning permission in Portsmouth?
Yes. Portsmouth City Council says a new HMO needs planning permission as well as the relevant HMO licence.
Do listed buildings need special consent?
Alterations that affect a listed building's special character can require listed-building consent as well as any other planning approval.
Do I have to hire an architect who responds?
No. Up to three interested local professionals can respond and there is no obligation to hire.
Ready to compare architects in Portsmouth?
Describe the property, objectives and project stage once, then compare interested Portsmouth architects and their proposals.
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