Extra bedroom and en-suite extensions in Great Harwood
For an extra bedroom and en-suite extension in Great Harwood, the first questions are always the same: how big, which approvals, and what it will cost. This page answers all three for Lancashire.
Before you start in Great Harwood, here's what applies.
- Postcode districts
- BB6
- County / area
- Lancashire, England
- Price region
- North West England
- Guide price
- £53,000–£72,000 (£1,900–£2,560 per m²), plus £5,500–£11,000 for the en-suite
- 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
- Accrington (3 miles), Blackburn (3.9 miles), Padiham (4 miles)
- Distance to Preston
- about 12.2 miles
- First visit
- Free, no obligation
About an extra bedroom and en-suite extension
This service suits you if you need another bedroom, or want a main bedroom with its own bathroom, without converting the loft or moving. You get a first-floor layout that connects well to your landing, an en-suite designed for plumbing and ventilation, a useful room downstairs, the approvals your nation needs and the build, managed by us and carried out by vetted teams working under S&K.
Around Great Harwood we also work in Accrington, Blackburn and Padiham, and across the rest of Lancashire. Postcode district in and near Great Harwood: BB6.
What it costs in Great Harwood
Guide prices for extra bedroom and en-suite extensions in North West England are around £1,900–£2,560 per m² of new floor space, including VAT. For a typical project with a 4 m × 3.5 m footprint on two floors (28 m² of new floor space), that's roughly £53,000–£72,000 (plus £5,500–£11,000 for the en-suite). These are guides, not quotes. Ground conditions, steelwork and access can move the figure either way.
| Spec | Per m² | A 4 m × 3.5 m footprint on two floors (28 m² of new floor space) |
|---|---|---|
| Essential | £1,750–£2,360 per m² | £49,000–£66,000 |
| Standard | £1,900–£2,560 per m² | £53,000–£72,000 |
| Premium | £2,280–£3,080 per m² | £64,000–£86,000 |
Planning and building regulations in Great Harwood
In England, an extra bedroom extension at the rear can be permitted development if it goes no more than 3 m beyond the original rear wall and stays 7 m from the rear boundary. Upper side windows, including en-suite windows, must be obscure-glazed and non-opening below 1.7 m. Side or deeper designs need 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 Great Harwood homes
Connecting to the landing
The new bedroom must be reached from the existing landing, usually through a new opening in the outside wall or by taking part of an existing bedroom as a corridor. We look at the stairs and landing first, because a poor connection can waste much of the new space.
Sound and privacy
Bedrooms above a kitchen or family room benefit from an insulated floor to reduce noise. Side-facing upstairs windows usually have to be obscure-glazed, so we place the main bedroom window to the rear and the en-suite window to the side where possible.
How we'd run your project
Visit and first ideas
One of our team visits your house in Great Harwood, checks the walls, roof and drains, and sketches out options with you.
Get it approved
Once you're happy with the design we submit it to the council for Great Harwood and deal with any questions from the planning officer.
Engineer it
Foundations sized for two floors, steels for any openings, and building control approval, all before anyone starts on site.
Build and sign-off
Vetted teams working under S&K build the extension, and we arrange the building control completion certificate at the end.
Questions about extra bedroom and en-suite extensions in Great Harwood
Who handles building regulations for a project in Great Harwood?
We handle it as part of the project. What's needed in England: building regulations approval (full plans recommended) from the council or a registered building control approver, with a completion certificate at the end. We prepare the drawings and the engineer's calculations, book the inspections and pass you the completion paperwork at the end.
Which postcodes do you cover around Great Harwood?
We cover Great Harwood (BB6) and nearby places including Accrington, Blackburn and Padiham, plus the rest of Lancashire. The first site visit is free.
How much does an extra bedroom and en-suite extension cost in Great Harwood?
Our guide for North West England, which covers Great Harwood, is £1,900–£2,560 per m² including VAT. A typical project with a 4 m × 3.5 m footprint on two floors (28 m² of new floor space) comes to about £53,000–£72,000 (plus £5,500–£11,000 for the en-suite). Design and approval fees are extra, and we fix the build price in writing once the design is agreed.
Does an extra bedroom add value to my house?
It usually does, though not always by the full cost. Nationwide's 2025 research found that adding a double bedroom to a two-bed house was linked to about 13% higher value, and a double bedroom and bathroom on a three-bed, one-bathroom house up to 24%. Local ceiling prices still apply.
How big should a new double bedroom be?
There is no legal minimum size for a bedroom in a house you own, so the test is whether it works. A comfortable double needs room for the bed with space to walk round it, wardrobes and a door that opens freely. We draw furniture on the plans so you can judge the space before anything is built.
Nearby
Close to Great Harwood? We work across the area, including:
Other extensions in Great Harwood
All two-storey extension services in Great Harwood · Extra bedroom and en-suite extensions across Lancashire
Book a free site visit in Great Harwood and we'll tell you what's possible, what approvals you need and what the design stage would cost.