“Architect” is a legally protected title when used in business or practice in the UK. Almost everything else you’ll hear a designer call themselves isn’t. That single fact causes more confusion in the early stages of a home project than almost anything else in the planning process, because it means two people offering broadly similar services can have very different training, insurance and accountability behind their title — and the person paying the fee usually has no easy way to tell which is which.
This article isn’t a case for hiring anyone in particular. It’s a guide to what each role actually is, so the decision to pay for help — and which kind — is an informed one rather than a guess based on who answered the phone first.
Start with what you’re actually trying to buy
Before choosing a professional, it helps to separate two different services that often get bundled together: design (working out what the project should look like and how it should function) and planning strategy (working out whether it’s likely to get permission, and how to present it so it does). A straightforward single-storey rear extension on an unconstrained suburban plot mostly needs the first. A contentious scheme in a conservation area, on a site with a previous refusal, or involving a change of use, often needs real weight put behind the second. Many projects need both, from the same person or from two people working together.
Architect
To call yourself an architect in business or practice in the UK you must be registered with the Architects Registration Board (ARB), the statutory regulator responsible for maintaining the UK Register of Architects and setting professional standards. Registered architects practising professionally are expected to have adequate and appropriate professional indemnity insurance, whether through their own practice or their employer.
The traditional UK route to registration has commonly been described as Parts 1, 2 and 3, combining academic study with practical experience and taking a minimum of around seven years by the most straightforward route. That system is currently in transition: ARB is moving towards a new outcomes-based education and registration framework, so Parts 1, 2 and 3 should no longer be treated as a permanent description of the route every future architect will follow.
Many, though not all, registered architects are also members of the Royal Institute of British Architects (RIBA), a separate professional membership body rather than the statutory regulator itself.
Where an architect tends to add the most value is on design-led or spatially complex projects — schemes where the layout, light, flow and relationship to the existing building genuinely benefit from someone trained to think about space rather than simply to produce compliant drawings. That doesn’t mean an architect is a legal requirement for an ordinary domestic planning application; it isn’t. It means the training is aimed at a particular kind of problem, and whether your project has that problem is the real question.
Architectural technologist or architectural designer
The Chartered Institute of Architectural Technologists (CIAT) awards Chartered Architectural Technologist status to suitably qualified members, who may use the designation MCIAT. Chartered Architectural Technologist is itself a protected professional title, although its protection comes through CIAT’s chartered framework rather than the statutory Architects Act regime that protects the title “architect”.
Technologists are trained specifically in the technical delivery of buildings — how a design gets built, drawn and detailed — and many practise as the lead designer on domestic extensions, loft conversions and other householder projects, offering a full service from initial drawings through to planning submission and, often, technical drawings for Building Regulations.
“Architectural designer” is a different matter. It’s a descriptive term, not a protected or regulated one, and it can be used by people with a genuine design qualification and by people with none at all. That isn’t automatically a red flag — plenty of capable, experienced designers work under exactly this title — but it does mean the title itself tells you nothing. If you’re considering someone describing themselves this way, the useful question isn’t what they call themselves; it’s whether they hold a recognised qualification, carry suitable professional indemnity insurance, and can show a portfolio of comparable projects and explain exactly what service they will provide.
Planning consultant
A planning consultant’s expertise is the planning system itself rather than building design — reading policy, assessing planning history and relevant comparable decisions, structuring an application to address a council’s likely concerns, and handling negotiation, appeals or enforcement where things get difficult.
The Royal Town Planning Institute (RTPI) is the relevant chartered professional body. Chartered Members may use the designation MRTPI and are subject to the Institute’s professional standards and Code of Conduct. Non-chartered planning consultants also operate in the market with varying levels of experience.
Planning advice tends to earn its fee most clearly where the site or proposal carries real planning risk: conservation areas, listed buildings, Green Belt land, sites with a previous refusal, schemes likely to attract significant objection, or anything involving a change of use or a policy conflict that needs to be argued rather than assumed. On a straightforward, policy-compliant householder extension, a good architect or technologist will typically handle the planning submission perfectly well without a separate consultant.
Structural engineer
A structural engineer’s role is structural design and calculations, not planning strategy — sizing beams, assessing load paths and designing structural alterations so that they can safely carry the loads placed on them.
This work usually becomes relevant when the project moves into detailed design and Building Regulations rather than being part of the planning application itself, although larger, unusual or technically challenging schemes may need structural input earlier. An engineer isn’t generally the person responsible for obtaining planning permission, and treating structural design or Building Regulations approval as equivalent to planning permission is a common and costly mix-up.
Builder
A good, experienced local builder often has genuinely useful practical knowledge — what’s buildable, what similar projects nearby have secured permission for, roughly what things cost. That’s worth having in the conversation. It isn’t the same as planning advice, and a builder’s confidence that “the council will be fine with this” is an opinion, not a professional assessment, however well-intentioned. Where a builder’s view and a qualified designer’s view conflict, it’s worth understanding why before proceeding on the builder’s say-so alone.
Which kind of help fits which problem?
| Your main issue | Professional most likely to help |
|---|---|
| Layout, appearance, space, light and overall design | Architect |
| Technical domestic design, detailing and Building Regulations drawings | Chartered Architectural Technologist |
| Planning policy, a difficult site, previous refusal, change of use or appeal | Planning consultant |
| Beams, load-bearing walls or other structural alterations | Structural engineer |
| Straightforward application you are confident preparing yourself | Potentially no professional at all |
These aren’t rigid boundaries. Architects and technologists often deal successfully with planning issues themselves, planning consultants sometimes work alongside designers from the outset, and more complicated projects can require several disciplines. The point is to buy the expertise your particular project actually needs rather than assuming one title covers everything.
Can you just do it yourself?
Yes. Applicants are free to prepare and submit their own planning application without engaging any professional at all. Most applications in England and Wales can be submitted through the Planning Portal; Scotland uses ePlanning.scot; and most applications in Northern Ireland can be submitted through the Planning Portal NI, although Mid Ulster District Council operates its own system.
For a simple, clearly policy-compliant project on an unconstrained site, doing it yourself can work perfectly well and save a meaningful sum of money. The trade-off is time, the risk of an invalid or poorly presented submission causing delay, and the absence of anyone to push back if the design itself isn’t quite right. Whether that trade-off is worth it depends entirely on the complexity of the project and your own comfort reading planning policy and technical drawing requirements.
Weighing up whether to pay for help
Rather than starting from cost, it’s worth starting from risk. A project is more likely to justify professional fees where it sits in a conservation area or affects a listed building, where a previous application on the site was refused, where neighbours are likely to object on grounds that sound like they might be material, where the site has genuine constraints — trees, slopes, flood risk, tight boundaries — or where the financial and disruption cost of getting it wrong (a refusal, a redesign, months of delay) would be painful. A low-risk, compliant project on a straightforward plot carries much less need for that spend.
Professional fees vary too widely by region, practice and project scale to usefully generalise here, and any national “average” figure quoted online should be treated with real caution — get quotes from two or three suitably qualified professionals for your actual project rather than budgeting against a number you found on a search results page.
Checking who you’re actually hiring
For architects, the ARB maintains the official Register of Architects, and it’s worth checking it directly rather than taking the title on trust. CIAT and RIBA maintain directories of their members and practices, while the RTPI provides a Directory of Planning Consultants for people looking for professional planning advice.
These checks can establish whether someone holds the professional status they claim and, where applicable, is subject to the relevant professional body’s standards. They do not by themselves tell you whether that person is right for your particular project.
Before appointing anyone, ask what work is actually included in the fee, who will personally carry it out, whether planning revisions or negotiations are included, what happens if the application is refused, and what professional indemnity insurance covers the work being undertaken. A clear written scope of services is at least as important as the letters after someone’s name.
The question this article set out to answer
Not “which professional is best,” but which kind of help, if any, actually matches your project. A simple, compliant scheme may need nothing more than confident measuring and a careful read of the council’s validation checklist. A contentious one on a constrained site is a different proposition entirely, and money spent on the right professional early can be far cheaper than redesigning after a refusal — a subject our companion article on responding to refusal covers in more detail.
