What is a garage conversion?
A garage conversion turns an integral or attached garage into habitable space, such as a study, playroom, bedroom or utility. The garage door is replaced with a wall and window, the floor is raised and insulated, and the walls and roof are brought up to building regulations.
How much does a garage conversion cost in St Helens?
In St Helens, a garage conversion typically costs £17,000–£28,000 for a single integral garage, including VAT at 20% (standard rate). Building costs in the North West run about 6% below the UK average, and the figures for St Helens are adjusted to reflect that. Design, structural calculations and council fees are extra.
| Size or type | Guide range |
|---|---|
| A single integral garage | £17,000–£28,000 |
| Higher specification | £28,000–£35,000 |
The main things that change the cost:
- Foundations under the old door opening
- Whether planning permission is needed
- Heating and flooring
- Bathroom or kitchen
Use the guide price tool to see how size and specification change the figure, then ask for a written, itemised quote.
Do you need planning permission for a garage conversion in St Helens?
Whether you need planning permission depends on your house and its location in England. In England converting an integral or attached garage usually does not need planning permission, unless a condition on the house removed permitted development rights (common on estates built in recent decades) or the house is listed. Building regulations approval is always needed.
Where work involves a shared wall, building on the boundary, or digging foundations within 3 metres of a neighbour’s building and deeper than its foundations (or within 6 metres for deeper work), the Party Wall etc. Act 1996 applies and notices must be served before work starts.
Our first visit includes a check of your planning history, so you know the route before paying for drawings.
What we handle
The work we manage on a garage conversion:
- Planning check for removed permitted development rights
- Drawings and building control application
- Wall and ceiling insulation
- Building control completion
- Floor raised with insulation and damp-proof membrane
- New wall and window to replace the garage door
How long does it take?
The build itself usually takes 3 to 6 weeks on site. Allow time beforehand for drawings and approvals, usually 6 to 12 weeks.
Building in St Helens
Terraced streets across the North West often suit rear dormers and single-storey kitchen extensions.
Our St Helens coverage includes postcode districts WA10, and we also work in nearby places such as Prescot, Ashton in Makerfield and Huyton.
How it works
- 01
Free visit
We look at the property, talk through what you want and measure up. There is no charge and no obligation.
- 02
Design and fixed quote
Drawings, structural calculations and an itemised, fixed price for the agreed specification.
- 03
Approvals
Planning or permitted development confirmation, building regulations and any party wall matters.
- 04
Build and sign-off
We run the build to a written programme and hand over the completion certificate.
Questions about garage conversions in St Helens
Can a detached garage be converted?
Yes, but using it as separate living accommodation may need planning permission.
Do I need building regulations approval?
Yes. Converting a garage to a habitable room needs building control approval for insulation, ventilation, fire safety and the new wall.
Can the floor be level with the house?
Yes. The garage floor is raised and insulated to match the house floor level.
How much does a garage conversion cost in St Helens?
In St Helens, a garage conversion typically costs £17,000–£28,000 for a single integral garage, including VAT at 20% (standard rate). Your fixed price depends on the survey and drawings.
Who approves a garage conversion in St Helens?
Planning matters in St Helens go to the council covering your address, and the work needs building control approval. We prepare and submit the applications for you.