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Double Garage Conversions Liverpool , twice the space

Twice the floor space means far more choice. A double garage conversion in Liverpool or across Merseyside can give you a self-contained annexe, two separate rooms, or one generous room with the other bay kept for storage, all planned around the way your household lives.

  • Annexe for a relative
  • One room, one garage
  • Second main bedroom
  • Kitchen and family space
Get a free quote Prices & estimator
Guide price from
£16k
Days for a straightforward single
7
Year warranty
10
Google rating
5.0★
LiverpoolWirralSeftonKnowsleySt HelensHalton

(Guide price · 2026)

£16,000 – £28,000

2026 guide for converting a double garage. Turning it into a full annexe with a kitchenette and shower room usually comes to around £28k–£40k+. You get a fixed, itemised quote after a free survey. You get a fixed, itemised price after a free survey.

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Included as standard

  • Free survey at your home, with layout ideas for the whole footprint✓
  • Fixed quote itemised room by room✓
  • Building Regulations application, inspections and completion certificate✓
  • New front wall and windows across the old door openings✓
  • Damp-proofed, insulated floor throughout✓
  • Fire-resisting separation where part of the garage stays in use✓
  • Heating, lighting and electrics sized for a larger space✓
  • 10-year insurance-backed warranty✓

Fixed price after a free survey

Double garage conversion in Liverpool: what fits

With a single garage the question is which one room you want. A double garage conversion in Liverpool is a different conversation, because the footprint is close to square and large enough to divide. That opens up proper layouts: a bedroom with a full-size ensuite, a family room with space for a dining table, an office and a guest room either side of a short hallway, or a small home for a relative.

Double garages turn up on detached houses across Merseyside, from Woolton and Gateacre to Heswall, Formby and Rainhill, and they are often the biggest unused space on the property. Because the width is there, two windows can sit side by side across the old door openings, so a converted double tends to feel bright and part of the house rather than tacked on.

You do not have to convert the lot. Many owners turn one bay into living space and leave the other as a garage or store for bikes, tools and garden furniture. Building Regulations require fire-resisting separation between the two halves, and we build that in as standard whenever part of the garage is kept.

Convert Your Garage project
Real Convert Your Garage project

Double garage conversion costs

As a 2026 guide, a double garage conversion typically costs around £16,000 to £28,000. A half conversion or one large open room sits towards the lower figure. Two separate rooms with a shower room, more windows and more involved heating and electrics push it towards the top.

A complete annexe with a kitchenette, shower room and its own entrance usually comes to around £28,000 to £40,000 or more. Each ensuite tends to add roughly £5,500 to £9,000, depending on the fittings and how far the waste pipe has to run to reach the drains.

Because a double can be laid out in so many ways, quotes from different builders are hard to compare. Ours is fixed and broken down line by line, so you can see what each part of the plan costs and change it before you commit. All our guide ranges are on the cost page.

“The extra space from the garage conversion is just what we needed. The team was super friendly and made the whole thing easy.”

★★★★★ Homeowner, Stalybridge · Garage conversion

(Ideas & layouts)

Double garage layouts that work

  1. 01

    Annexe for a relative

    Bedroom, shower room, sitting area and kitchenette behind their own front door, so a parent can live independently with you close at hand.

  2. 02

    One room, one garage

    Convert a single bay into a bedroom or office and keep the other for the car or storage, divided by a fire-rated wall and door.

  3. 03

    Second main bedroom

    A large bedroom with a dressing area and full ensuite, adding a second principal suite to the house.

  4. 04

    Kitchen and family space

    Open the garage into the kitchen and use the full width for dining and relaxing, with daylight from two front windows.

  5. 05

    Office plus guest room

    A short hallway with a study on one side and a spare room on the other, each with its own window and door.

  6. 06

    Gym with a boot room

    Most of the floor for training equipment, with a utility and boot store at the back for laundry and muddy shoes.

(Before & after)

Same garage, about a week apart

A real single garage conversion by our team. Drag the handle to compare the cluttered garage with the finished room.

The garage after conversion
The same garage before conversion

A double garage as a family annexe

Turning a double garage into an annexe is one of the main reasons people get in touch. It can give an ageing parent their own front door with family a few steps away, or let grown-up children save for a deposit without everyone sharing a kitchen. A layout that works well puts the bedroom and shower room at the back, where it is quieter, and the living space and kitchenette at the front, where the new windows bring in most light.

If the annexe is used by family and stays part of your home, an attached double garage conversion is often permitted development. Making it a separate dwelling that could be let or sold, or converting a garage where permitted development rights were removed, needs planning permission from your council, and we will tell you which applies when we survey. Our garage conversion with ensuite page covers bathrooms in more detail.

Convert Your Garage project
Real Convert Your Garage project

Getting the structure right on a wider span

A double garage brings a few details a single does not. Some have two doors divided by a brick pier, others one wide opening carried on a long lintel, and the new front wall has to be detailed for whichever you have. Roofs range from pitched and tiled, sometimes with useful storage above, to older flat roofs that need upgrading to meet today's insulation standards.

A bigger room also needs more thought about warmth. That usually means two radiators rather than one and well-insulated flooring across the whole area, which matters even more on exposed spots near the Wirral or Sefton coast. All of this is priced from the start, Building Regulations sign-off is part of every job, and you will get a clear programme, as a double naturally takes longer than a single.

Where a double garage is joined to a neighbour's, or shares a wall on either side, the Party Wall Act may apply if we build on or cut into that wall. We will explain whether it affects you at the survey so nothing catches you out later.

Since 2002
Convert Your Garage, a family-run firm based in Unsworth, Bury

(Real projects)

Annexes, kitchenettes and family rooms

See all projects →
  • Convert Your Garage project: kitchenette
  • Convert Your Garage project: kitchenette
  • Convert Your Garage project: kitchenette
  • Convert Your Garage project: kitchenette
  • Convert Your Garage project: living
  • Convert Your Garage project: living
  • Convert Your Garage project: living
  • Convert Your Garage project: living

(How it works)

Survey to sign-off, with one team

  1. 01

    Free survey & design

    We measure up, look at the floor level and the door opening, and talk through how you will use the room.

  2. 02

    Fixed, itemised quote

    Drawings and a fixed price, line by line, so you know exactly what you are paying for before anything starts.

  3. 03

    Building Regs submitted

    We make the Building Regulations application and book every inspection along the way.

  4. 04

    The build

    Door out, insulated wall and window in, floor raised, insulation, electrics, heating and plaster.

  5. 05

    Sign-off

    Finishing to your spec, then the completion certificate and your 10-year warranty.

“It really is amazing what they have managed to achieve in the space of 2 weeks and is so much better than we expected.”

★★★★★Verified customer · Garage conversion · 5.0 from 108 Google reviews

(Good to know)

Double Garage Conversions: FAQs

Still got a question? 0161 766 6518

  • 01What does a double garage conversion in Liverpool cost?

    As a 2026 guide, a double garage conversion in Liverpool or the wider Merseyside area typically costs around £16,000 to £28,000. A full annexe with kitchenette and shower room is usually around £28,000 to £40,000 or more. Your fixed price follows a free survey.

  • 02Can I convert just one side of my double garage?

    Yes. One bay becomes living space and the other stays as a garage or store. Building Regulations call for fire separation between them, which is included in our quote.

  • 03Could my double garage become a granny annexe?

    Very often, yes. An annexe that stays part of your home is frequently permitted development, while a separate dwelling that could be let or sold needs planning permission.

  • 04How long will a double garage conversion take?

    Longer than a single, which can be done in as little as 7 days. The layout makes the biggest difference, particularly ensuites and kitchenettes, and the programme is set out in your quote.

  • 05Do you convert double garages across Merseyside?

    Yes. We cover Liverpool, Wirral, Sefton, Knowsley, St Helens and Halton. Garage Conversions Liverpool is run by Convert Your Garage from Unsworth, Bury, and the surveyor comes to your home. See areas we cover.

  • 06Is planning permission needed to convert a double garage?

    Usually not for an attached or integral double garage. It may be needed in a conservation area, for a listed building, or where a planning condition removed permitted development rights.

(Keep exploring)

Related pages

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