First-floor extensions in Blaydon-on-Tyne

Blaydon-on-Tyne: the key facts for this kind of project.

Postcode districts: NE21 and NE39
County / area: Tyne and Wear, England
Price region: North East England
Guide price: £22,500–£33,000 (£1,620–£2,340 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: Whickham (2 miles), Newburn (2 miles), Newcastle upon Tyne (4 miles)
Distance to Newcastle upon Tyne: about 4 miles
First visit: Free, no obligation

About a first-floor extension

A first-floor extension suits you if your house already has a single-storey extension and you need more space upstairs. You get a structural check of the existing walls and foundations, a design that ties the new floor into the house, the approvals your nation needs, building regulations approval and the build, managed by us and carried out by vetted teams working under S&K.

We cover Blaydon-on-Tyne (NE21 and NE39) and the places around it, including Whickham (2.0 miles), Newburn (2.0 miles) and Newcastle upon Tyne.

What it costs in Blaydon-on-Tyne

For budgeting in Blaydon-on-Tyne, allow around £22,500–£33,000 for a first-floor extension with 4 m × 3.5 m of new first-floor space (14 m²). That's based on £1,620–£2,340 per m² including VAT for North East England. The fastest way to a firmer number is a free site visit, after which we price the design stage in writing.

Spec	Per m²	4 m × 3.5 m of new first-floor space (14 m²)
Essential	£1,490–£2,150 per m²	£21,000–£30,000
Standard	£1,620–£2,340 per m²	£22,500–£33,000
Premium	£1,940–£2,810 per m²	£27,000–£39,500

Planning and building regulations in Blaydon-on-Tyne

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 Blaydon-on-Tyne homes

Can the existing structure take it?

Many single-storey extensions were built with foundations, walls and lintels sized for one storey. We find out what is there with trial holes and, where available, the original building control drawings. The engineer then decides whether to reuse, strengthen or rebuild parts of the structure.

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

Measure and listen
A visit to Blaydon-on-Tyne to understand how you live in the house now and what the extra rooms need to do, plus a first look at the structure.
Get it approved
Once you're happy with the design we submit it to the council for Blaydon-on-Tyne 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 sign-off
Vetted teams working under S&K build the extension, and we arrange the building control completion certificate at the end.

Questions about first-floor extensions in Blaydon-on-Tyne

Which postcodes do you cover around Blaydon-on-Tyne?

We cover Blaydon-on-Tyne (NE21 and NE39) and nearby places including Whickham, Newburn and Newcastle upon Tyne, plus the rest of Tyne and Wear. The first site visit is free.

How much does a first-floor extension cost in Blaydon-on-Tyne?

Our guide for North East England, which covers Blaydon-on-Tyne, is £1,620–£2,340 per m² including VAT. A typical project with 4 m × 3.5 m of new first-floor space (14 m²) comes to about £22,500–£33,000. Design and approval fees are extra, and we fix the build price in writing once the design is agreed.

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.

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 Blaydon-on-Tyne? We work across the area, including:

Other extensions in Blaydon-on-Tyne

All two-storey extension services in Blaydon-on-Tyne · First-floor extensions across Tyne and Wear

Tell us about your house in Blaydon-on-Tyne and we'll call you back to arrange a free, no-obligation visit.