Garage Conversion Cost: What Shapes the Price

The items every garage conversion quote contains

Most garages were built as unheated stores, so almost every surface needs work before the space meets the Building Regulations for a room. A clear quote lists these items separately, which makes it easier to compare one proposal with another.

Cost of a garage conversion to a bedroom

A bedroom is one of the simpler outcomes because it needs no water supply. The main costs are the floor, door infill, insulation, a window large enough for escape where required, heating and electrics. Ventilation and fire safety are part of the building control checks.

Adding a bathroom or shower room

The cost of a garage conversion to a bedroom and bathroom rises because of drainage. A ground-floor shower room near an existing soil pipe is straightforward; one far from the drains may need a pump or a new run under the slab. The survey should establish the route before the layout is fixed.

Moisture control matters too. Extraction and the right wall finishes keep a new bathroom from creating condensation in the rest of the room.

Conversion to living space or a kitchen

Turning a garage into living space, a playroom or an office is close to the bedroom scope. A garage conversion kitchen adds plumbing, extraction and a stronger electrical supply, and sometimes opening the wall to the house, which may need structural design and a steel beam.

• Opening into the house: structural design and building control
• Kitchen: water, waste, extraction and appliance circuits
• Utility room: similar services in a smaller footprint

Integral, attached, half or double garages

An integral garage already shares walls and often a roof with the house, which simplifies insulation and heating. A detached garage may need more work on the walls, roof and foundations, and its use can change the planning position. A half garage conversion keeps storage at the front while converting the rear, and a double garage gives more layout freedom but more floor and wall to treat.

Is the average price useful?

Searches for an average garage conversion price or the cost of a garage conversion in the UK return wide ranges because the scope varies so much. A figure means little until you know whether it includes the floor, heating, plumbing and approvals. Comparing the itemised scope is more reliable than comparing headline numbers.

Mighty Oak Construction does not publish prices for garage conversions. A free site visit is followed by a detailed, itemised written quote that sets out each of the items above.

Keeping the budget under control

Decide the use of the room before asking for quotes, so every builder prices the same thing.

• Confirm whether a bathroom or kitchen is needed
• Check the floor level against the house
• Ask whether building control fees are included
• Find out how the door infill will be finished externally
• Ask how heating will be provided