What architects do and why you might need one
An architect designs buildings and spaces, then manages the construction process to make sure the design is built properly. They're not the same as a surveyor or a structural engineer, though you'll often need all three on a bigger project.
You'll need an architect if you're planning a major renovation, extension, or new build. They handle planning permission drawings, building regulations approval, and site inspections during work. For smaller jobs — a single-storey extension, minor alterations — you might get away with a designer or surveyor instead.
Architects bring three main things to a project: creative design that fits your needs and budget, technical knowledge about building regulations and planning law, and site management so contractors actually do what was agreed. They also liaise with planners, building control, and structural engineers, which saves you stress and protects your investment.
In Cardiff, most residential work involves extensions to Victorian terraces, conversions of period properties, or new builds on infill sites. An architect familiar with the area knows the local planning officers, understands what the council will and won't accept, and knows how to work with older building stock. That local knowledge is worth paying for.
How much do architects charge in Cardiff
Architect fees vary hugely depending on the project size, complexity, and what stage you need them for.
For a straightforward house extension (say, single-storey, £80,000–£150,000 build cost), expect to pay £6,000–£15,000 in architect fees. This usually covers design, planning drawings, building regulations drawings, and basic site visits during construction.
A full house renovation or two-storey extension (£150,000–£400,000 build) typically costs £12,000–£35,000 in fees. A new-build house can run £25,000–£60,000+ depending on size and specification.
Architects charge in three common ways:
Percentage of build cost: 8–15% is typical. Works well on bigger projects where the fee scales with complexity.
Fixed fee: You agree a set price upfront. Good for smaller, defined projects like a standard extension.
Hourly rate: £150–£250 per hour in 2026. Useful for initial consultations or specialist work.
Many architects offer a free initial consultation to discuss your project and give a rough fee estimate. Always get the proposal in writing, spelling out exactly what's included — some include site visits and variations, others charge extra for these.
Don't just pick the cheapest. A slightly higher fee often means better design, fewer planning rejections, and smoother construction. Poor drawings cost you money when contractors have to guess what you meant.
Accreditations and professional standards
The only accreditation that actually matters for architects in the UK is registration with the ARB (Architects Registration Board). If someone calls themselves an architect and isn't ARB-registered, they're breaking the law. Check the ARB register online — it's public and free.
ARB registration means the person has formal training (usually a degree in architecture plus a placement year), has passed professional exams, and has done at least two years' supervised experience. They're also bound by a code of conduct and must carry professional indemnity insurance, which protects you if something goes wrong.
RIBA (Royal Institute of British Architects) is a professional body for architects. Most registered architects are RIBA members, but it's not a legal requirement. RIBA membership shows they're committed to professional standards and continuing education, but it doesn't mean non-members are less qualified.
When you're hiring, ask to see proof of ARB registration and professional indemnity insurance. The insurance is essential — it covers your costs if the architect's errors cause you financial loss. Minimum cover is typically £500,000 to £2,000,000 depending on the firm size.
Also check whether they're chartered — RIBA Chartered status requires additional experience and ongoing training. It's a good sign but not strictly necessary for smaller residential projects. Most reputable Cardiff architects have both ARB registration and RIBA membership.
What's specific about architecture in Cardiff
Cardiff's housing stock is mostly Victorian and Edwardian terraces (1880s–1920s), especially in areas like Canton, Cathays, and Roath. These buildings are beautiful but tricky: solid walls (no cavity), slate roofs, sash windows, and often poor insulation. An architect familiar with Cardiff knows how to upgrade these properties without ruining their character and while meeting modern building regulations.
Planning permission in Cardiff follows strict conservation rules in many areas. If your property is listed or in a conservation area — and many Cardiff homes are — you need planning consent even for seemingly small changes like replacing windows or adding a roof extension. Planners are also quite strict about extensions to terraces; they don't want to see bulky rear extensions that block light to neighbours or spoil the street scene. A local architect knows how to design something that planners will accept.
Building regulations in Wales also have specific requirements around energy efficiency and water usage. Your architect needs to understand current Welsh Building Standards, which differ slightly from England.
Cardiff Council's planning department is reasonable but detailed. Applications that miss information or don't follow guidance get rejected, costing you time and money. An architect who works regularly in Cardiff knows what planners want to see, knows the officers personally, and can guide you through the process smoothly.
The ground in some areas (particularly near the river and in parts of the city centre) has flood risk, which affects insurance and building design. If you're near a flood zone, your architect needs to account for this in their drawings.
How to find and hire an architect in Cardiff
Start by asking for recommendations from friends, family, or local builders who've worked with good architects. Personal recommendations are gold — you'll hear about their actual experience, not marketing spiel.
You can also search the ARB register at arb.org.uk and filter by location. RIBA's website has a find-an-architect tool. Best Trades Wales also lists local architects. Make a shortlist of three to five firms.
Look at their portfolios. Have they done similar projects? Do you like their design style? Do they seem to understand residential work, or are they mostly commercial? A firm that's designed twenty house extensions will be better for your project than one that mainly does office buildings.
Contact your shortlist and ask for an initial consultation. Most will do this free or for a small fee (£200–£500). Come prepared with photos of your house, rough sketches of what you want, and your budget. A good architect will listen, ask sensible questions, and explain how they'd approach your project. Red flags: if they push a design without understanding your needs, if they're vague about costs, or if they won't discuss timescales.
Once you've chosen someone, get a written proposal. It should cover: the scope of work (which stages they're handling), fees and payment terms, insurance details, timescales, and what happens if the project changes. Don't shake hands on a verbal agreement.
Check references if it's a big project. Ask previous clients about communication, whether the architect stuck to budget and timescale, and whether they'd hire them again.
Key questions to ask when hiring
Before you commit, ask these questions:
1. Are you ARB-registered and do you carry professional indemnity insurance? Non-negotiable. Ask to see the certificates.
2. How much will this cost and how do you charge? Get a detailed breakdown. Is it a fixed fee, percentage, or hourly rate? What's included — site visits, variations, liaison with building control?
3. How long will the project take from start to finish? From first meeting to practical completion, get realistic timescales for each stage. Planning typically takes 8–13 weeks; building regulations approval 4–8 weeks; construction varies by project.
4. Will you manage the contractor, or do I? Some architects take full responsibility for site management and quality control. Others produce drawings and leave you to manage the builder. Know which you're getting.
5. What happens if the project costs go over budget? Architects don't control what contractors charge, but good ones produce accurate specifications so prices don't spiral. Ask how they manage costs and what happens if a contractor quotes higher than expected.
6. Can I see examples of similar projects you've completed in Cardiff? Local experience matters. Ask about conservation area work, extensions to period properties, or whatever matches your project.
7. How will you communicate during the project? Will you get regular updates? How do you handle changes and variations? Can you contact them easily?
8. If things go wrong, what recourse do I have? Their insurance covers negligence. Understand what's protected and what isn't.