By Tony Ryder, award-winning architectural designer, Tony Ryder Design, Woodbridge, Suffolk. Last updated: 26 October 2026.
Short answer: No, you do not legally need an architect to extend a house in England. The law protects the title “architect”, not the work of designing an extension. You need a competent professional to produce planning and Building Regulations drawings. That can be an ARB-registered architect, an architectural designer or a chartered architectural technologist. The right choice depends on your site, your budget and how much coordination you want handled for you.
Quick answer: your options at a glance
- Architect: legally protected title, registered with the Architects Registration Board (ARB), usually seven years of training.
- Architectural designer: an unprotected, descriptive title. Quality depends on the individual’s experience, insurance and track record.
- Chartered architectural technologist: professional body is the Chartered Institute of Architectural Technologists (CIAT), strongest on technical detail and Building Regulations.
- Draughtsperson: turns your own design into drawings. Does not usually design.
- Design-and-build firm or builder: convenient, but the designer is not independent of the person pricing the work.
Do you legally need an architect to extend your house?
No. The Architects Act 1997 restricts who may call themselves an “architect”, but it does not say an architect must design your extension. Anyone competent can prepare a planning application. What the law does require is that the work meets Building Regulations, and, if your home is listed or in a designated area, that you obtain the right consents.
So the real question is not “do I need an architect?” but “who is best placed to design, coordinate and de-risk my project?”
What is the difference between an architect, an architectural designer and an architectural technologist?
| Role | Is the title protected? | Regulated or represented by | Typically strongest at |
|---|---|---|---|
| Architect | Yes (Architects Act 1997) | ARB (registration); many are also RIBA members | Concept design, complex or listed buildings, contract administration |
| Architectural designer | No | Varies. Check professional memberships, insurance and portfolio | Residential design, practical coordination, often a builder’s eye for cost and buildability |
| Chartered architectural technologist | “Chartered Architectural Technologist” is a CIAT title | CIAT | Technical drawings, Building Regulations, detailing |
| Draughtsperson | No | None | Drawing up a design you have already settled |
Definition: An architectural designer is a professional who designs buildings but is not (or does not trade as) an ARB-registered architect. Because the term is unregulated, always ask for evidence of experience rather than relying on the title. The same advice applies to any professional you hire.
How much does each option cost?
Fees vary widely by project, so treat published figures as a guide only.
- Homebuilding & Renovating (October 2022) quotes architects at roughly 5 to 12 percent of construction cost for design only, and 20 to 25 percent where the architect also project manages the whole job.
- Planning Signal gives typical planning-drawing fees for an extension of about £1,500 to £3,500 with an architect and £1,000 to £2,500 with a technologist, noting technologists often charge less for comparable drawing services.
- Tony Ryder Design fee approach: [Tony to confirm fee structure, e.g. fixed fee by stage, and whether to quote a typical range].
Cheaper drawings are not always cheaper projects. Ask what the fee includes: measured survey, planning application, Building Regulations pack, structural engineer coordination, tender and site visits. A low fee that excludes these often costs more once you add them back.
When should you choose a registered architect?
A registered architect is often the right call when:
- You want a fully contract-administered build with a formal architect role in the building contract.
- The building is listed, or the scheme is large, complex or likely to be contentious.
- You value the RIBA and ARB regulatory framework, including a statutory code of conduct.
When is an architectural designer a strong choice?
An experienced architectural designer suits homeowners who want a single point of contact, design that is priced against real construction costs, and someone who will bring in the right specialists. This is how Tony Ryder Design works: one point of contact coordinating structural engineers, chartered architectural technologists, surveyors and planning consultants, so you are not managing five professionals yourself. Tony has more than 12 years of experience across residential and commercial projects and has designed and built as well as designed, which shapes how he checks buildability early. See the Tony Ryder Design process for how each stage works.
Tony Ryder Design has been awarded Best of Houzz Service in 2025 and 2026, and holds a 5.0 rating across 15 Houzz reviews [Tony to confirm wording and link to the Houzz profile].
What should you know about extending in Suffolk and on the Heritage Coast?
Local context changes who you need and what they must know:
- Conservation areas: towns such as Aldeburgh and Woodbridge have conservation areas where materials, roof forms and openings are scrutinised. A restoration project in an Aldeburgh conservation area, converted into two holiday lets, is one of the projects on the Tony Ryder Design Work page.
- Designated landscapes: parts of the coast fall within the Suffolk Coast and Heaths National Landscape (formerly AONB), which has its own management plan and design guidance.
- Coastal exposure: salt, wind and flooding influence material choice and detailing as much as planning does.
- Pre-application advice: East Suffolk Council offers pre-application advice, which is worth using for sensitive sites. [Tony to confirm current fee and lead time before publishing.]
What is changing in planning from 31 October 2026?
New regulations, made on 15 July 2026, introduce a National Scheme of Delegation for Planning Functions in England from 31 October 2026. According to Planning Geek, ward-member call-ins and objection-number triggers will no longer work as automatic routes to committee, and applications still undetermined on that date are expected to follow the new procedure. Elmbridge Borough Council has said householder extension applications “will no longer be referred to planning committee by Councillors”. Councils will publish their own revised arrangements, so check how your local planning authority applies the scheme to householder applications.
What this means in practice: more decisions will rest with planning officers, so a well-evidenced application matters more. A clear design statement, accurate drawings and sensible pre-application dialogue are your best protection, regardless of the title of the person who prepares them.
7 questions to ask any architect, designer or technologist before you hire
- Can I see three completed projects similar to mine, and speak to those clients?
- What professional memberships and Professional Indemnity insurance do you hold?
- What exactly is in your fee, and what is excluded?
- Who coordinates the structural engineer, surveyor and planning consultant?
- What is your experience with my local planning authority and my site type (conservation area, coastal, listed)?
- How do you test my design against my budget before planning is submitted?
- Who will I deal with day to day, and what happens during construction?
Frequently asked questions
Do I need an architect for planning permission?
No. Anyone competent can prepare and submit a planning application, though accurate drawings and a clear design statement improve your chances.
Is an architectural designer as good as an architect?
It depends on the individual. The title “architectural designer” is not regulated, so judge on portfolio, references, insurance and process rather than title.
What is the difference between an architect and an architectural technologist?
Architects are ARB-registered and typically cover concept design through to contract administration. Chartered architectural technologists, represented by CIAT, specialise in technical design, detailing and Building Regulations compliance.
How much does an architectural designer cost for an extension in the UK?
Published guidance for architects ranges from about 5 to 12 percent of construction cost for design only, and lower drawing-only fees are quoted for technologists. Request a written fee scope before you compare quotes. Tony Ryder Design will publish its own fee calculator and guide [link when live].
Do I need Building Regulations approval for an extension?
Yes, in almost all cases, whether or not planning permission is required.
Can an extension be built under permitted development?
Often, yes, but not in conservation areas for some elements, and not on listed buildings. Current limits include 3m (terraced or semi-detached) or 4m (detached) single-storey rear extensions without prior approval. Check with your local authority before relying on this.
Next step
If you are planning an extension, a remodel or a new home in Suffolk or across England, talk to Tony Ryder Design about a free initial conversation [Tony to confirm offer]. You can see recent projects and how the design process works first.