Evidence to gather first
Share photos, measurements, access notes, and any relevant survey or product information so architectural designer quotes are based on the same facts.
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A stronger brief helps tradespeople price the same job rather than guessing from incomplete information.
Share photos, measurements, access notes, and any relevant survey or product information so architectural designer quotes are based on the same facts.
Ask whether preparation, materials, waste removal, making good, testing, and follow-on trades are included or priced separately.
Compare timing, insurance, review quality, warranty assumptions, and how clearly each architectural designer explains exclusions before choosing a shortlist.
£500–£2,000 for surveys, £2,000–£8,000+ for full architectural design and planning
Typical UK costs. Actual quotes depend on job scope, location, and materials. Post your job free on Job2Build to get personalised quotes.
Use the same scope, finish standard, and access assumptions in every conversation so quotes stay comparable instead of drifting into vague sales copy.
Define the deliverables first: survey, drawings, calculations, planning support, or contract admin.
Ask how many revisions, meetings, and site visits are included before extra fees start.
Confirm who coordinates with planning, building control, or structural input if other specialists are needed.
Request a timeline for first draft, revisions, and final issue so cheap quotes are not hiding delay.
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Verify professional accreditation (ARB/RIBA for architects, RICS for surveyors, ICE for engineers)
Check their experience with your property type and local planning authority
Ask about their track record with planning applications in your area
Confirm they carry professional indemnity insurance
Review their portfolio for projects similar in scale and style to yours
Architects must be ARB registered to use the title. Chartered surveyors are regulated by RICS. Structural engineers are typically chartered with IStructE or ICE. Always verify professional registration.
Low-friction quotes are not enough on their own. Push these points into writing before you let a low price or early availability become the deciding factor.
A consultant who cannot define the deliverable, review rounds, or planning assumptions.
Very low fixed fees with no explanation of what is excluded or billed later.
No professional indemnity cover or reluctance to share registration details.
Advice that treats planning, party wall, or structural coordination as someone else's problem.
You do not legally need an architect for most home extensions, but one can add significant value — better design, smoother planning applications, and avoiding costly mistakes. For listed buildings or complex projects, professional design advice is strongly recommended.
An architect is ARB-registered and holds a protected title requiring 7+ years of training. An architectural designer may be equally skilled but without ARB registration. Both can produce drawings and submit planning applications.
You need a structural engineer whenever you are removing or altering load-bearing walls, adding a loft conversion, building an extension, or addressing subsidence. Building control will require structural calculations for these works.
A party wall agreement is required under the Party Wall etc. Act 1996 when you carry out certain work near or on a shared wall with a neighbour. A party wall surveyor manages the notice process and resolves any disputes.
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