First-floor extensions in Skelmersdale
Our first-floor extensions service in Skelmersdale covers everything: measured survey, design, planning or permitted development checks, structural design, building control and the build itself.
Quick reference for homeowners in Skelmersdale.
- Postcode districts
- WN8
- County / area
- Lancashire, England
- Price region
- North West England
- Guide price
- £24,000–£34,500 (£1,710–£2,470 per m²)
- Approval route
- It may be permitted development if it goes no more than 3 m beyond the original rear wall (counting any single-storey part) and stays 7 m from the rear boundary; otherwise it needs planning permission.
- Nearest towns
- Ormskirk (4.6 miles), Wigan (5.6 miles), Ince-in-Makerfield (6.5 miles)
- Distance to Preston
- about 15 miles
- First visit
- Free, no obligation
About a first-floor extension
A first-floor extension is a new upstairs room built on top of an existing single-storey part of your house, such as a rear kitchen extension, a utility or a side annexe. It adds a bedroom, bathroom or study without enlarging the footprint. Whether it works depends mainly on whether the walls and foundations below can carry the extra load.
We cover postcode district WN8 in and around Skelmersdale, along with neighbouring Ormskirk, Wigan and Ince-in-Makerfield.
What it costs in Skelmersdale
A guide price for Skelmersdale: around £24,000–£34,500 for 4 m × 3.5 m of new first-floor space (14 m²). That works out at £1,710–£2,470 per m² of new floor space, including VAT at 20%. Design fees, structural calculations and approval fees are separate and listed on our prices page.
| Spec | Per m² | 4 m × 3.5 m of new first-floor space (14 m²) |
|---|---|---|
| Essential | £1,570–£2,270 per m² | £22,000–£32,000 |
| Standard | £1,710–£2,470 per m² | £24,000–£34,500 |
| Premium | £2,050–£2,960 per m² | £28,500–£41,500 |
Planning and building regulations in Skelmersdale
In England, adding a first floor turns a single-storey extension into one of more than one storey. To be permitted development, the extension as a whole must go no more than 3 m beyond the rear wall of the original house and stay at least 7 m from the rear boundary, with matching materials and roof pitch. Over a side extension it always needs planning permission, costing £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 Skelmersdale homes
Tying into the house
The new floor and walls must line up with the existing first floor, often through a new opening in the rear wall above the old one. Floor levels, the position of upstairs windows and the existing roof all affect where the opening can go, so we survey both floors carefully.
Matching the roofline
A first-floor extension often changes how the back or side of the house looks more than the original single storey did. Matching the main roof pitch and materials, and keeping the ridge below the main ridge, usually gives the best result and is expected for permitted development in England.
How we'd run your project
Free site visit
We visit your home in Skelmersdale, look at the structure, access and boundaries, and talk through what you want the new rooms to do.
Get it approved
Once you're happy with the design we submit it to the council for Skelmersdale and deal with any questions from the planning officer.
Structure and building control
A structural engineer sizes the foundations and steels, and we get building regulations approval before work starts.
Build and hand over
We manage the build from groundworks to decoration-ready finish and hand over with the completion paperwork.
Questions about first-floor extensions in Skelmersdale
How long does a first-floor extension take?
Allow 4 to 8 weeks for survey and design, then the approval period (councils should decide householder applications within 8 weeks of validation), then 4 to 8 weeks of technical design, which can overlap. The build itself usually takes 14 to 20 weeks, longer for large or complex designs.
How much does a first-floor extension cost in Skelmersdale?
Our guide for North West England, which covers Skelmersdale, is £1,710–£2,470 per m² including VAT. A typical project with 4 m × 3.5 m of new first-floor space (14 m²) comes to about £24,000–£34,500. 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 Skelmersdale?
We cover Skelmersdale (WN8) and nearby places including Ormskirk, Wigan and Ince-in-Makerfield, plus the rest of Lancashire. The first site visit is free.
Will the first-floor extension match my house?
It should, and in England matching materials and roof pitch is a condition of permitted development. We match brick, tile, mortar colour and window style where we can, and tell you at the design stage if an exact brick match is not available, so you can choose between the closest match and render or cladding.
What happens to the room below while the first floor is built?
The old roof is removed, so the room below is exposed for a short period. We fit temporary weather protection, plan the work so the roof comes off only when the new structure is ready, and agree with you which rooms will be out of use and for roughly how long.
Nearby
Close to Skelmersdale? We work across the area, including:
Other extensions in Skelmersdale
- Rear
- Side
- Wraparound
- Part two-storey
- Over a garage
- Semi-detached
- Detached
- Kitchen and bedrooms
- Bedroom and en-suite
All two-storey extension services in Skelmersdale · First-floor extensions across Lancashire
Want a figure first? Try our guide price tool, then book a free visit to firm it up.