Do I Need an Architect for a House Extension?

If you’re thinking about adding more space to your home, whether it’s a kitchen extension, extra bedroom, or a two-storey addition - you’ve probably asked yourself:

“Do I actually need an Architect for this?”

The short answer is: no, you are not legally required to hire an architect or designer. However, having professional design input can make a huge difference to the success of your project.

Above an completed extension by Ben at Hollis Design

When You Don’t Have to Hire an Architect/Designer

Permitted development extensions: Some small extensions can be built without full planning permission. In theory, you could go straight to a builder with your idea.

Very simple designs: If you’re just adding a basic box-shaped room, a draftsperson or builder might be able to create basic drawings.

Tight budgets: If your only concern is building something as cheaply as possible, you might be tempted to skip professional design.

But in each of these cases, you take on risk: poor design, costly mistakes, or planning refusal.

Inside the cosy extension with nautical-themed decor features comfortable sofas with sea-inspired cushions, a plush rug, and a well-lit space leading to the modern kitchen.

Why hiring an Architect or Designer is worth it

Professionals are an investment, not a cost. Even for a modest extension, an experienced professional designer can add value that goes beyond just “doing drawings”:

Better design = better living We look at light, flow, and how the new space connects with your existing home, not just how to add square metres.

Planning permission made easier Extensions often need council approval. Good design and properly prepared drawings give you a much higher chance of approval the first time. (We at Hollis Design are fortunate to have an approval rate most practices would dream of)

Avoiding costly mistakes Builders can only build what’s on the drawings. If something is unclear or poorly planned, you’ll pay for it later during construction.

Adding long-term value A well-designed extension doesn’t just give you space now - it increases the resale value of your home.

 Why this matters on the Isle of Wight

On the Isle of Wight, many homes fall within conservation areas or have coastal considerations. Local planning rules can be strict, and overlooking them could cause delays or rejections. Working with a local architectural practice like Hollis Design in Cowes means your project is designed with these regulations in mind from day one.

So, do you Need an Architect?

Legally, no. Practically, almost always. An extension is a big investment and the design stage is the best place to make sure you get it right.

I have never met anyone who did it alone twice. Some try it the first time, and they always learn from their mistakes and hire a professional the second time around.

Like the old saying goes: You don’t need a parachute to go sky diving, you only need a parachute if you want to go sky diving twice…

Another angle of the inside of the extension.

At Hollis Design, we help homeowners across the Isle of Wight design extensions that not only meet their needs, but also pass smoothly through planning and add long-term value to their property.

Thinking about an extension?

Learn more about our House Extension Design Services and get a no-obligation quote.