Extensions over a garage in Barton-upon-Humber
We plan and build extensions over a garage for homeowners in Barton-upon-Humber and nearby. Every project starts with a free visit and a design stage priced in writing before any work begins.
Quick reference for homeowners in Barton-upon-Humber.
- Postcode districts
- DN18 and DN19
- County / area
- Lincolnshire, England
- Price region
- East Midlands
- Guide price
- £31,000–£45,000 (£1,720–£2,500 per m²)
- Approval route
- Planning permission is needed: in England, permitted development only allows single-storey extensions to the side.
- Nearest towns
- Hull (5.9 miles), Brough (5.9 miles), Immingham (10.7 miles)
- Distance to Lincoln
- about 32.2 miles
- First visit
- Free, no obligation
About an extension over a garage
An extension over a garage is a new first-floor room built on top of an existing attached garage, usually a bedroom, en-suite or study. It uses a footprint you already have, so it adds floor space without taking any garden. The garage walls and foundations often need strengthening or replacing to carry the new floor.
We cover postcode districts DN18 and DN19 in and around Barton-upon-Humber, along with neighbouring Hull, Brough and Immingham.
What it costs in Barton-upon-Humber
Guide prices for extensions over a garage in the East Midlands are around £1,720–£2,500 per m² of new floor space, including VAT. For a typical project with 3 m × 6 m of new first-floor space (18 m²), that's roughly £31,000–£45,000. Kitchens, bathroom fittings and flooring are priced separately so you can compare like with like.
| Spec | Per m² | 3 m × 6 m of new first-floor space (18 m²) |
|---|---|---|
| Essential | £1,580–£2,300 per m² | £28,500–£41,500 |
| Standard | £1,720–£2,500 per m² | £31,000–£45,000 |
| Premium | £2,060–£3,000 per m² | £37,000–£54,000 |
Planning and building regulations in Barton-upon-Humber
In England, most garages sit beside the house, so building over one makes a two-storey extension beyond a side wall, which always needs planning permission. If the garage is at the rear, the 3 m and 7 m rules for two-storey rear extensions apply, measured from the original house. A householder application costs £548 (or £575 for applications made from 8 December 2026).
Approval in England: Householder planning application: £548 (or £575 for applications made from 8 December 2026). Lawful development certificate: £274 (about £288 for applications from 8 December 2026). Councils should decide householder applications within 8 weeks of validation.
Building regulations: Building regulations approval (full plans recommended) from the council or a registered building control approver, with a completion certificate at the end.
Design points for Barton-upon-Humber homes
Checking the garage foundations
Garages are often built on shallow strip footings sized for a single-storey wall and a light roof. A trial hole shows their depth and condition, and the engineer decides whether they can carry two storeys or need underpinning or new foundations inside the garage.
Fire separation
If the garage stays a garage, the floor between it and the room above, and any door into the house, must give fire separation under building regulations. That usually means fire-resisting plasterboard ceilings, sealed gaps and a fire door, which we design in from the start.
How we'd run your project
Free site visit
We visit your home in Barton-upon-Humber, look at the structure, access and boundaries, and talk through what you want the new rooms to do.
Design and approvals
We draw the extension and check it against the rules for England, then apply for planning permission or a certificate of lawfulness, whichever fits.
Technical design
We prepare the building regulations drawings, structural calculations and specification so the build price can be fixed.
Build
Foundations, walls, floor, roof, windows, then first and second fix. We break through into the house as late as we can.
Questions about extensions over a garage in Barton-upon-Humber
How much does an extension over a garage cost in Barton-upon-Humber?
Our guide for the East Midlands, which covers Barton-upon-Humber, is £1,720–£2,500 per m² including VAT. A typical project with 3 m × 6 m of new first-floor space (18 m²) comes to about £31,000–£45,000. Design and approval fees are extra, and we fix the build price in writing once the design is agreed.
Which postcodes do you cover around Barton-upon-Humber?
We cover Barton-upon-Humber (DN18 and DN19) and nearby places including Hull, Brough and Immingham, plus the rest of Lincolnshire. The first site visit is free.
Do I need planning permission for an extension over a garage in Barton-upon-Humber?
Barton-upon-Humber is in England, so England planning rules apply. Planning permission is needed: in England, permitted development only allows single-storey extensions to the side. If in doubt, a lawful development certificate or a planning application gives you certainty before you build.
Can my garage take a room on top?
Sometimes, but it needs checking. Many garages are built on shallow footings with thin walls, designed only for a single storey. We dig a trial hole and inspect the walls, and the structural engineer decides whether to reuse them, strengthen them, underpin the footings or build new foundations inside the garage.
Do I need to convert the garage as well?
No. You can keep the garage for parking or storage and build only the room above, as long as the floor between them and any door into the house meet fire separation rules. Converting the garage at the same time is often good value, because the walls and foundations may be upgraded anyway.
Nearby
Other towns near Barton-upon-Humber:
Other extensions in Barton-upon-Humber
- Rear
- Side
- Wraparound
- Part two-storey
- First floor
- Semi-detached
- Detached
- Kitchen and bedrooms
- Bedroom and en-suite
All two-storey extension services in Barton-upon-Humber · Extensions over a garage across Lincolnshire
Want a figure first? Try our guide price tool, then book a free visit to firm it up.