You have decided you want a home extension. Now you need to work out who actually makes it happen. Do you need an architect? Can your builder handle it? What is an architectural technician and do you need one of those instead? The answer depends on your project, but there are clear rules of thumb that will stop you overspending on professionals you do not need or cutting corners where it genuinely matters.

Key Topics Covered

  • Whether you are legally required to hire an architect
  • What an architect actually does beyond producing drawings
  • How architectural technicians differ and when they are the better choice
  • When a fully qualified architect is worth the extra cost
  • The risks of leaving it all to your builder
  • How permitted development projects still need the right paperwork
  • How Rosebrick manages the whole process for you

At Rosebrick Developments, we take on the coordination of the full process as standard. We work with experienced local professionals across Mansfield, Nottinghamshire, South Yorkshire, and Derbyshire, including architectural technicians and structural engineers, to make sure the right drawings are produced, the right applications are submitted, and building control is managed throughout. Contact us today to learn more!

Do you legally need an architect?

No. There is no legal requirement to use an architect for a domestic extension in the UK. Anyone can submit plans for planning permission, and plenty of straightforward extensions are built every year without a fully qualified architect ever being involved.

That said, not needing one and not benefiting from one are two different things.

What does an architect actually do?

An architect does more than produce drawings. They can assess the best design approach for your space, identify potential planning issues before they become problems, manage the planning application on your behalf, produce construction drawings for building regulations, and coordinate with structural engineers, surveyors, and builders throughout the build.

In the UK, architects must be registered with the Architects Registration Board (ARB). Many are also members of the Royal Institute of British Architects (RIBA). That registration matters because it means they are bound by a professional code of conduct and are required to hold professional indemnity insurance, which protects you if something in their design turns out to be wrong.

Architect fees vary significantly depending on the complexity of your project and how involved they are. For a straightforward extension, expect to pay anywhere from a few thousand pounds upwards for a full service.

What is an architectural technician and do they cost less?

An architectural technician or technologist sits between a draughtsman and a fully qualified architect. They specialise in the technical side of design, producing planning and building regulation drawings to a professional standard. Chartered Architectural Technologists are members of the Chartered Institute of Architectural Technologists (CIAT) and are also required to hold insurance.

For a straightforward single-storey extension, a good architectural technician will do everything you need at a lower cost than a fully qualified architect. They can prepare and submit planning applications, produce building regulation drawings, and liaise with building control. What they typically do not offer is the same level of design creativity or experience with complex or contentious planning applications.

If your project is a standard rear extension on a normal residential plot in Mansfield or Nottinghamshire and the design is not particularly ambitious, an architectural technician is often the more practical and cost-effective choice.

When should you use a fully qualified architect?

There are situations where paying for a fully qualified architect is the right call:

If your property is listed or sits within a conservation area, the planning process is more complex and the consequences of getting it wrong are more serious. An architect with experience in heritage applications will give you a much better chance of approval first time.

If your extension is large, design-led, or involves significant structural changes, an architect’s input on how to get the most from the space is genuinely valuable. The difference between a decent extension and a great one often comes down to how well the design was thought through at the start.

If your application is likely to face objections or the project sits in a complicated planning environment, having a professional with experience of that local authority is worth the extra cost.

Can your builder handle it?

Some builders will tell you they can manage the whole process, including getting drawings done and submitting planning applications. In some cases, particularly with design and build companies, this is perfectly workable. The builder commissions the drawings, manages the submission, and takes responsibility for the build.

The risk with this approach is that the builder’s priority is construction, not design quality or planning strategy. Drawings produced this way tend to be functional rather than considered. There is also a question of who carries the design liability if something goes wrong. Most builders do not hold professional indemnity insurance for design work in the way a registered architect or technician does.

For a very simple project where you are not concerned about design quality and the planning situation is straightforward, a good design and build contractor can handle the process competently. For anything more involved, getting an independent professional to produce and own the drawings is the safer route.

Rosebrick Developments sits in a different position to a standard builder. We coordinate the full process, working with experienced architectural technicians and structural engineers to make sure the right drawings are produced and submitted correctly. That means you get the construction expertise of a specialist contractor alongside properly managed design and planning, without having to stitch together separate professionals yourself.

What about permitted development projects?

If your extension falls within permitted development limits and does not require a planning application, you still need building regulations approval. That means you still need accurate construction drawings produced to a standard that satisfies building control. A builder quoting from rough sketches is not the same thing.

It is also worth considering a Lawful Development Certificate even for permitted development projects. This is a document from the local planning authority confirming your extension was built lawfully, and it will be requested by solicitors and buyers’ conveyancers when you come to sell. Getting this right from the start costs far less than dealing with queries during a sale.

How Rosebrick manages this for you

At Rosebrick Developments, we take on the coordination of the full process as standard. We work with experienced local professionals across Mansfield, Nottinghamshire, South Yorkshire, and Derbyshire, including architectural technicians and structural engineers, to make sure the right drawings are produced, the right applications are submitted, and building control is managed throughout.

You do not need to independently find an architect, chase a technician for drawings, or figure out whether your project needs planning permission or prior approval. We handle those conversations and coordinate the professionals involved, so that by the time ground is broken, everything is properly in place.

We build to regulations from the start, which means no rework, no failed inspections, and no delays caused by drawings that did not match what building control actually needed.

If you are planning an extension and want to understand exactly what professionals your project needs and what that process looks like, contact Rosebrick Developments today.