Garage Conversion Cost in Liverpool: A 2026 Guide

What do published guides say a garage conversion costs?

We do not publish our own price list, because the work varies too much from one garage to the next for a single number to mean anything. What we can do is point you to two widely used national cost guides, so you have a starting point. The figures below were checked November 2026.

MyJobQuote

MyJobQuote’s garage conversion cost guide (last updated 5 November 2026) gives an average garage conversion cost of around £14,500, and breaks it down by garage type:

Rated People

Rated People’s guide to how much a garage conversion costs, which states its costs are accurate as of 2026, says that on average a garage conversion costs between £18,000 and £28,300. For an integral single garage of about 18 m², it gives a figure of around £19,800 including VAT.

Why do the two sources give different figures?

At first glance the two guides seem to disagree. Rated People’s average range starts higher than MyJobQuote’s average figure. That is not unusual, and it does not mean either is wrong. Cost guides differ for several reasons:

• Scope. One guide may assume a basic conversion to a single room, while another assumes a more complete job with new windows, heating, flooring and decoration.
• What is included. Drawings, building control fees, electrics, plumbing and finishes may or may not be counted in the headline figure.
• VAT. Rated People states its integral figure includes VAT. If one figure includes VAT and another does not, that alone makes a noticeable difference.
• Finish. A plain plastered room with a carpet costs much less than one with a fitted kitchen, a shower room or underfloor heating.
• Region. National averages blend high-cost and lower-cost parts of the country. Labour and material costs in Merseyside will not exactly match any national average.
• How the data is gathered. Each guide collects its figures in its own way, from its own users and trades, at different times.

The practical lesson is to read any published figure as a broad range, not a price. If a quote for your garage sits well outside those ranges, it is worth asking what is and is not included, rather than assuming it is too high or too low.

What affects the cost of a garage conversion?

When we price a garage conversion in Liverpool, these are the things that make the most difference.

How does the garage type change the cost?

Both published guides agree on the general pattern: integral garages tend to cost least, attached garages more, and detached and double garages most. That matches what the work involves.

An integral garage conversion already has a room or the house roof above it and at least one wall that is part of the house. The main jobs are the infill, the floor, the external walls and the fire strategy. An attached garage often has its own flat roof, which may need rebuilding with insulation, and walls that are a single skin of brick. A detached garage conversion starts from a fully separate structure, so the walls, floor and roof all need upgrading, and power, water and drainage have to be brought across the garden. Planning questions about how the building will be used can also add fees.

A double garage roughly doubles the floor area to finish and often has a wide opening that needs a structural beam or careful infill design, which explains why it sits at the top of the published ranges.

How does the room you want change the cost?

The use of the room matters almost as much as the garage itself.

• Bedroom or officeUsually among the simpler uses: insulation, heating, sockets, lighting and windows. A bedroom may need an escape window if it is reached through another room.
• Playroom or living roomSimilar to a bedroom, though French doors or extra glazing add to the cost.
• Utility roomNeeds water supply, waste and ventilation, which adds plumbing work.
• Shower room or WCDrainage is often the biggest variable. A long run to the drains, or a pump where gravity drainage is not possible, adds cost.
• Kitchen extensionOften involves opening up the wall between the garage and the existing kitchen, plus extraction, drainage and the kitchen itself.
• AnnexeCombines several of the above: a bedroom, living area, shower room and sometimes a small kitchen, plus possible planning and council tax matters.

If you are weighing up uses, our pages on a garage to bedroom conversion and a garage annexe explain what each one needs in more detail.

What fees should you budget for beyond the build?

People sometimes compare quotes without realising that one includes fees and another does not. When you budget, check whether these are covered:

• Drawings. Prepared by an architect or architectural technician where the job needs them. See design and drawings for garage conversions.
• Structural calculations. Needed for beams, lintels or openings in loadbearing walls.
• Building control fees. Charged by your council’s building control team or a registered building control approver. Fees vary by council and by route, so check them directly. Our page on Building Regulations for garage conversions explains the routes.
• Planning fees. Only if a planning application or Lawful Development Certificate is needed or wanted.
• Party wall costs. If you share a wall with a neighbour, the Party Wall etc. Act 1996 may apply, and there can be surveyor costs.
• Asbestos testing and removal. If an older roof or other material is suspected to contain asbestos, it must be tested and, if needed, removed by a qualified contractor before work.

Is a garage conversion cheaper than an extension?

Often, yes, because the walls, roof and floor slab already exist, so there is less new structure to build and usually fewer planning questions. But it is not always a small job. A detached garage with a poor roof and no foundations under the door, or a conversion that needs a new shower room with a long drainage run, can come closer to the cost of a small extension. It is worth comparing the two only once you know what your garage needs.

Can you save money on a garage conversion?

There are sensible ways to keep costs under control without cutting corners on the parts that matter:

• Keep wet rooms (shower, WC, utility, kitchen) close to existing drains where possible.
• Choose a standard window size for the infill wall rather than a bespoke one.
• Decide on the layout and finish before the quote, so the price reflects what you actually want.
• Consider a part garage conversion if you only need a modest room and want to keep storage.
• Do decorating yourself at the end, if you are happy to.

What we would not recommend is skipping building control, under-insulating, or leaving out the damp-proof membrane to save money. Those are exactly the shortcuts that cause the damp, cold and paperwork problems covered in our guide to garage conversion problems, and they cost more to put right later.

Does a garage conversion add value?

We do not make claims about how much value a conversion adds, because that depends on your house, your street and the local market, and in some areas losing a garage or parking space can matter to buyers. A local estate agent or surveyor is the right person to ask. A conversion with a building control completion certificate is much easier to sell than one without.

How do you get an accurate quote?

A useful quote is based on seeing the garage. When you call, we ask what type of garage it is, roughly how old the house is, what the room will be used for and whether you know of any planning conditions. We then arrange to look at the walls, floor level, roof, existing door opening and where services run, talk through layout options and approvals, and give you a written quote. We cover homes across Merseyside, from West Derby and Maghull to the Wirral, and the same approach applies to every job.

When you compare quotes from different builders, check that each one covers the same scope: infill, floor, walls, roof, windows, electrics, heating, plumbing, drawings, building control and finishes. A cheaper quote that leaves out building control or the floor build-up is not really cheaper. If you would like to talk it through, you can reach us as your local garage conversion specialist by phone or through the form.