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 Letchworth Garden City?
In Letchworth Garden City, a garage conversion typically costs £19,000–£32,000 for a single integral garage, including VAT at 20% (standard rate). That range is adjusted for the East of England, where domestic building work typically costs around 6% above the national average. Design, structural calculations and council fees are extra.
| Size or type | Guide range |
|---|---|
| A single integral garage | £19,000–£32,000 |
| Higher specification | £32,000–£40,000 |
The main things that change the cost:
- Integral, attached or detached
- Single or double garage
- Foundations under the old door opening
- Heating and flooring
For a figure based on your own measurements, try the guide price tool, then book a free home visit for a fixed quote.
Do you need planning permission for a garage conversion in Letchworth Garden City?
Approvals for a garage conversion in Letchworth Garden City follow the rules for 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.
Building regulations approval comes from the council’s building control service or a registered building control approver. The work is inspected at key stages, such as foundations, drainage and insulation, and a completion certificate is issued at the end.
We check this for your address before design work starts, so there are no surprises later.
What we handle
From survey to sign-off, the job normally involves:
- Foundation check under the garage door opening
- Wall and ceiling insulation
- New wall and window to replace the garage door
- Building control completion
- Planning check for removed permitted development rights
- Electrics, heating and plastering
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 Letchworth Garden City
Across the East of England, 1930s and post-war semis, newer estates and rural cottages all feature, each with different extension and loft options.
Projects in Letchworth Garden City (SG6 and SG7) are surveyed in person before we quote, so the price reflects your actual property.
How it works
- 01
Visit and measured survey
A free visit to understand the project, check access and take measurements.
- 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 handover
Work follows the agreed programme, with inspections along the way and a completion certificate at the end.
Questions about garage conversions in Letchworth Garden City
Can a detached garage be converted?
Yes, but using it as separate living accommodation may need planning permission.
Do you build garage conversions in Letchworth Garden City?
Yes. We build garage conversions across Letchworth Garden City, including postcodes SG6 and SG7. Every project starts with a free home visit.
Do I need planning permission for a garage conversion?
Usually not if the work is internal and the house keeps its permitted development rights. Many newer houses have planning conditions that remove those rights, in which case an application is needed.
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.
How much does a garage conversion cost in Letchworth Garden City?
In Letchworth Garden City, a garage conversion typically costs £19,000–£32,000 for a single integral garage, including VAT at 20% (standard rate). Your fixed price depends on the survey and drawings.