How Long Does a Garage Conversion Take in the UK and Will I Need to Move Out?

Turning an underused garage into a bedroom, office or gym is one of the quickest ways to add usable space to your home. A common worry, though, is how long the work will take and how much disruption it will cause.

In this post, we look at typical timescales for garage conversions in the UK, what affects the schedule, and whether you are likely to need to move out while the work is done.

How long does a typical garage conversion take?

For most single garages, the on-site build is surprisingly quick. As a guide:

Single garage – dry conversion (no plumbing): around 2–4 weeks on site

Single garage with en-suite: around 3–6 weeks on site

Double garage or more complex layouts: around 4–8 weeks on site

These figures cover the main construction phase once everything is agreed and ready to start. Design, quoting and any approvals sit before this and can add a few extra weeks to the overall timeline.

What makes some garage conversions faster than others?

Several factors affect how long a garage conversion will take:

Dry vs wet conversion

A dry conversion (no bathroom or kitchen) is usually faster. Adding plumbing for an en-suite, shower room or kitchenette adds time for drainage, pipework and finishes.

Condition of the existing structure

If the walls, floor and roof are sound, work is more straightforward. If upgrades are needed for insulation, damp-proofing or structure, this adds time but also improves the final result.

Size and layout

A simple single garage converted into one room is quicker than a double garage split into several spaces.

Access and parking

Easy access for materials and skips helps the team work more efficiently and can shorten the programme.

Will I need to move out during a garage conversion?

In most cases, you can stay in your home while the garage conversion is carried out. The work is usually focused on one area, and much of the early stage is external or contained within the garage itself.

You might choose to be away for a day or two during noisier stages, such as breaking out the old floor or cutting through for new openings, but a full move-out is rarely necessary.

What does a typical garage conversion process look like?

At Prestige Living Designs, a garage conversion usually follows a clear, four-step process:

Free site visit

We assess the existing structure, talk through how you want to use the space and check what is realistically achievable.

Design and quote

We prepare a detailed design and quote, including any structural upgrades needed to the walls, floor or roof, and whether plumbing is required.

Build and first fix

We remove the garage door, build the new front wall, install insulation and complete first fix electrics – and plumbing where a wet room is planned.

Finishing and sign-off

We complete flooring, plastering and decoration, then manage Building Control sign-off so the conversion is fully certified.

How much does a garage conversion cost in 2026?

Every project is different, but 2026 UK guide prices for garage conversions often sit in these ranges:

Single garage – dry conversion: £8,000 – £20,000

Single garage – with en-suite: £18,000 – £28,000

Double garage conversion: £18,000 – £38,000

Detached garage / annexe: £20,000 – £40,000+

Detached garages typically cost more where new water, drainage or heating connections are required. A proper survey is always the best way to confirm exact pricing for your home.

Do I need planning permission for a garage conversion?

Most garage conversions are treated as an internal change of use and fall under Permitted Development, so they do not usually need full planning permission.

You are more likely to need permission if:

• You are making major changes to the external appearance

• The property is in a conservation area or is listed

• You are converting a detached garage into a self-contained annexe

Regardless of planning, Building Regulations always apply, covering insulation, electrics, fire safety and, for wet rooms, drainage and ventilation. We handle the Building Control application and inspections as part of the build.

Quick answers to common garage conversion questions

How long will my garage conversion actually take?

Most single garage conversions take between two and four weeks on site. More complex projects with plumbing or structural upgrades can take six to eight weeks.

Will the work be very disruptive?

There will be some noise and dust, but because the work is focused on the garage, disruption to the rest of the house is usually manageable. We plan the sequence carefully to keep things as tidy and safe as possible.

Can a detached garage become a self-contained annexe?

Yes, provided the structure and access are suitable. It typically costs more than an integral garage conversion because new water, drainage and heating connections usually need to be run from the main house.

Thinking about a garage conversion in the UK?

If you are wondering how long a garage conversion would take in your home – and what it might cost – the best next step is a proper survey.

Get in touch with Prestige Living Designs for a free, no-obligation visit. We will look at your existing garage, talk through how you want to use the space, and give you clear advice on timescales, costs and whether planning permission is likely to be needed.