Garage Conversion FAQs – UK Guide (2023–2025)

Thinking about converting your garage? Here's everything you need to know — fast, clear, and straight to the point.

💷 How much does a garage conversion cost in the UK?

A garage conversion is significantly more cost-effective than a new extension.

Standard garage conversion: from £7,500–£15,000+

3x4m home extension: typically £17,000+

Garage conversions offer better value, less disruption, and faster turnaround.

🏗️ Do I need planning permission to turn a garage into an office?

In most cases, no.
As long as the conversion is internal and doesn’t increase the external footprint of the building, it falls under Permitted Development.

⚠️ However, if your home has restrictions from previous planning approvals (e.g. your garage must remain for parking), you may need approval. Always check locally.

🛠️ Can I convert my garage into an office or extra room?

Absolutely.
Internal garage conversions are ideal for home offices, especially with the rise in remote working. As long as you're not altering the structure externally, planning permission usually isn’t required.

💸 Are garage conversions worth the investment?

Yes — they’re one of the highest-ROI home improvements available.

Adds up to 20–30% to your home’s value

Cheaper, quicker, and easier than an extension or moving house

Converts wasted space into something functional and valuable

If the cost of the work is less than the added property value — it’s a no-brainer.

🚽 Can I put a toilet or shower in my garage conversion?

Yes.
You can add a toilet, shower, or even a full bathroom. Whether you’re creating an annexe, office, or studio flat, these additions are possible with proper planning and plumbing.

🏡 Can I turn my garage into a granny annexe?

Yes — and it’s often quicker than building a new extension.

You’ll need to consider plumbing, insulation, and possibly a ‘change of use’ application if it’s to be used as separate living accommodation.

Some cases still fall under Permitted Development. Always confirm with your local authority.

🛏️ Can you convert a detached garage into a bedroom or flat?

Yes, you can.
Detached garage conversions are ideal for:

Guest bedrooms

Home offices

Self-contained flats or Airbnb rentals

You may require change of use planning if it's for independent living or commercial use.

🧱 Do I need architect drawings for a garage conversion?

Not always.
For most standard conversions, a qualified surveyor or builder can draw up the plans and handle the building regulations process. For complex projects or bespoke designs, an architect may be beneficial — but is not a legal requirement.

🌡️ What’s the best way to insulate a garage conversion?

Walls & Garage Door: Rigid foam insulation (e.g. Celotex or Kingspan)

Floor: Rigid insulation boards + subfloor

Ceiling/Roof: Mineral wool or foam board between joists

Proper insulation ensures energy efficiency and makes the room comfortable year-round.

🧰 What are the different types of garage conversions?

1. Full Integral Garage Conversion
Converts a standard single garage into a full room — ideal for bedrooms, offices, or extra living space.

2. Double Integral Garage Conversion
Great for large open-plan rooms or dual-use spaces (e.g. office + guest room).

3. Part Garage Conversion
Keeps partial garage functionality (e.g. storage at the front, utility room at the back).

4. Detached Garage Conversion
Perfect for annexes, studios, gyms, or Airbnb accommodation. May require additional planning depending on usage.

📞 Want expert advice?
Taurus Construction & Development Ltd offers full garage conversion services across the UK — from planning to completion.

No pressure, just honest answers. Let’s bring your vision to life.