How Do You Choose an Architectural Designer?

To choose the right person to design your extension, start with one key distinction: only people registered with the Architects Registration Board (ARB) can legally call themselves an "architect", but most home extensions under £100k are designed by architectural designers — who do the same extension and planning work without the ARB title, usually at a lower fixed fee. Then check experience, portfolio, references and clear fees.

So, you're planning to extend or renovate your home on a budget of under £100,000 — a smart move that more and more UK homeowners are making rather than moving. But before you knock down walls, one decision can make or break the project: who designs it for you.

Architect vs Architectural Designer — What's the Difference?

This trips a lot of people up. "Architect" is a protected title: by law, only someone registered with the Architects Registration Board (ARB) can call themselves one. A chartered architect has completed years of formal training and registration.

An architectural designer does much of the same work — designing your extension, producing planning and building-regulations drawings, and handling the application — but isn't ARB-registered. For the vast majority of home extensions, loft and garage conversions, that's exactly what you need, and it usually costs less.

When you might want a chartered architect: listed buildings, conservation-heavy sites, or large, structurally complex projects. When an architectural designer is ideal: most single- and two-storey extensions, loft and garage conversions, and planning applications for family homes.

Why the Right Designer Matters

A good designer isn't just for grand projects. They can help with:

• Designing a new kitchen-diner, loft conversion or garden room
• Making your home more space-efficient and future-proof
• Navigating planning permission and building regulations

The right one saves you money in the long run by avoiding costly mistakes, maximising space and light, and keeping the project running smoothly.

Common Mistakes When Choosing a Designer

• Choosing on price alone: the cheapest quote isn't the best value. You want someone who understands your vision and works to your budget.
• Not checking experience: make sure they've done similar projects (period homes, small extensions, your local planning authority).
• Skipping references: always ask to see past work and speak to previous clients.
• Not being clear about your needs: if you don't communicate what you want, you risk a design that doesn't suit how you live.

How to Choose: Step by Step

1. Know what you need. More space for the family? Better storage? A more open-plan layout? Write down your priorities and must-haves.

2. Look for the right experience. Some designers specialise in modern homes, others in period properties or sustainable design. If your home is listed or in a conservation area, check they've handled those rules.

3. Check the fit for your project. Decide whether you need a chartered architect or whether an architectural designer covers your project (for most extensions, it does).

4. Ask for examples and references. Ask for a portfolio of similar work and don't be shy about speaking to past clients — a good designer will happily provide them.

5. Meet them. A call or meeting tells you whether you get on. Ask how they work, how they handle budgets, and how they deal with changes or problems mid-project.

6. Get a clear fee structure. Ask exactly how they charge and what's included (planning applications, site visits). A fixed, agreed fee means no nasty surprises.

7. Trust your instincts. You'll be working closely together, so a good relationship matters.

Practical Tips

• Be honest about your budget — including a 10–15% contingency for surprises.
• Share your vision — photos, sketches, even Pinterest boards.
• Ask for a detailed brief covering design, function and energy goals.
• Get everything in writing — a contract setting out scope, fees and timelines.

Final Thoughts

Choosing the right designer is one of the most important decisions for your project. Take your time, do your research, and ask plenty of questions. For most home extensions under £100k, an experienced architectural designer will listen to your needs, work to your budget, and help you create a home you love — without the higher fees of a chartered architect.