Garage conversions in Corby
Garage conversions in Corby, signed off under building regulations and finished as a proper room.
A full single garage conversion in Corby typically costs £14,000–£19,000, and a part conversion to a utility room or store starts from about £9,500, with the building control fee paid to the council. Building control in Corby is North Northamptonshire Council building control: quoted by the council for each job (no published schedule).
- Typical cost
- £14,000–£19,000 full conversion
- Building control
- Council building control: free quote per job
- Planning advice
- North Northamptonshire Council: £187
- Time on site
- A few weeks
Our 2026 guide prices, all in. Your fixed price comes in writing after the site visit. Council fees checked October 2026.
What garage conversions in Corby usually involve
If your garage is really just somewhere the clutter lives, converting it is the cheapest way to gain a proper room — an office, snug, utility, playroom or extra bedroom — without extending the footprint. We convert integral, attached and detached garages across Corby and the Northamptonshire villages, bringing the floor, walls and roof up to habitable standard so the space is warm and dry all year. Most conversions here are permitted development, and we confirm that for your property before starting.
What a proper Corby garage conversion involves
A genuine conversion is far more than boarding over the garage door — that is what meets Building Regulations and stops the room feeling cold and damp.
The floor is insulated, given a damp proof membrane tied into the house and raised to match the adjoining rooms, so there is no step down onto a cold slab.
The walls, including the old garage opening, are rebuilt or lined, insulated and plastered, with a window or door to suit the property. We match the new frontage to the existing brick or render so it never looks like a filled-in garage.
Roof, heating, electrics and ventilation are all brought up to standard. Many Corby homes, particularly on the estates, have a single integral garage that converts neatly into a downstairs office or snug off the hall.
Permitted development or planning?
Most garage conversions are permitted development because the work is internal and the footprint does not change. The usual exceptions are listed buildings, conservation-area properties, and newer estate homes where permitted-development rights were removed by a planning condition. We check the planning history for your address first and tell you where you stand.
Corby & villages we cover
We cover Corby and the surrounding villages including Weldon, Gretton, Cottingham, Middleton, Rockingham and Stanion.
Ground, drainage and conservation in Corby
Corby sits on the Northampton Sand ironstone that fed the steelworks, and large areas around the town were opencast quarried and restored. Ground can change from natural ironstone to clay or fill within a garden, so we dig before we design the base and drainage.
Corby has nine conservation areas, including the Old Village, Cottingham and Middleton, Gretton, Rockingham, Stanion, Great Oakley and Weldon. Its only Article 4 direction (Kingswood) controls houses in multiple occupation and does not affect driveways, porches or extensions.
The Willow Brook runs through Corby and Weldon, with an Environment Agency flood storage reservoir at Weldon, so properties near the brook need drainage planned with care. You can check any address on the Environment Agency flood map.
Sources: North Northamptonshire conservation areas · Priors Hall Park.
Permissions and fees in Corby
- Planning routeMost garage conversions are internal and need no planning permission, unless a planning condition keeps the garage for parking or the house is listed. Building regulations approval is always needed. Planning Portal guidance
- Pre-application adviceIf anything is unclear, North Northamptonshire Council gives householder pre-application advice for £187. Pre-application advice
- Building regulationsNorth Northamptonshire Council building control: quoted by the council for each job (no published schedule). Building control fees
- BuildOne fixed written price, then the build, inspections and the completion certificate.
Council fees and rules checked October 2026. Planning fees are the national fees from 1 April 2026.
What you get
- Building regulations route chosen and the application handled
- Floor insulated and raised to match the house
- Door opening built up in matching brick or stone
- Heating, electrics and ventilation to current standards
The specification
- Building regulations application
- Damp proof membrane and insulated floor
- Foundation and wall in the old door opening
- Insulated walls and ceiling, plastered
- New window or door
- Completion certificate from building control
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Garage conversions in Corby: questions
Will I lose parking?
Is Building Control sign-off included?
How long does it take?
Can the new room be a bedroom?
How much does a garage conversion cost in Corby?
Do I need planning permission for a garage conversion in Corby?
Who handles building control in Corby?
Request a site visit in Corby
We measure up, check levels and drainage, and send a written proposal with the build-up, the programme and one whole price. No pressure and no follow-up sales calls.