Two-storey wraparound extensions in Swansea and Neath Port Talbot

Swansea and Neath Port Talbot at a glance

Nation: Wales
Price region: Wales
Postcode areas: SA
Towns covered: 9 listed below, plus surrounding villages
Approval route: Usually needs planning permission, because the combined side and rear works rarely meet every permitted development test.
Site visits: Free, no obligation

What a two-storey wraparound extension involves

A two-storey wraparound extension suits a house with space both beside it and behind it, where you want to transform the layout rather than add a single room. You get one design for the whole L-shape, the planning application, structural design for the corner and the openings into the house, building regulations approval and the build, managed by us and carried out by vetted teams working under S&K.

Swansea and Neath Port Talbot towns we list: Swansea (SA1), Neath (SA10), Briton Ferry (SA12), Gorseinon (SA4), Clydach (SA6) and Ystalyfera (SA9). Every other address in Swansea and Neath Port Talbot is covered as well.

Guide price in Wales

In Wales, which includes Swansea and Neath Port Talbot, we'd expect a two-storey wraparound extension to cost around £111,000–£152,000 for an L-shaped footprint of about 28 m² wrapping the side and rear, on two floors (56 m² of new floor space), or £1,980–£2,710 per m² including VAT. We'll give you a written design-stage price first, then a fixed build price once the drawings are agreed.

Spec	Per m²	Typical project
Essential	£1,820–£2,500 per m²	£102,000–£140,000
Standard	£1,980–£2,710 per m²	£111,000–£152,000
Premium	£2,370–£3,260 per m²	£133,000–£182,500

Rules in Wales

In Wales, a wraparound would have to pass both the side and rear tests to be permitted development: 10.5 m to the opposite side boundary, a 1 m set-back from the front and no more than 50% added width, plus the 4 m and 3 m rear depth limits and 10.5 m to the rear boundary. Many wraparounds therefore need a householder application, which costs £585.

Approval in Wales: Householder planning application: £585. Councils normally decide householder applications within 8 weeks.

Building regulations: Building regulations approval under the Welsh Approved Documents, which differ from England's in places (notably energy efficiency).

The Party Wall etc. Act 1996 applies in Wales, so notices may be needed for work on or near a shared wall or boundary.

Getting the design right

Daylight to the middle

A deep L-shaped plan can leave the middle of the ground floor dark, because the old rear rooms are now enclosed. We use wide rear openings, a well-placed stair and, where part of the extension is single storey, roof lights, while keeping total glazing within the Part L allowance.

The corner post

At the outside corner of the L, there is no existing wall to carry the floor above. Opening the ground floor fully usually means a steel frame or a corner post, and the engineer's design sets how slim it can be. We decide early whether you want a clear corner or a visible post.

How we work in Swansea and Neath Port Talbot

Understand the brief
At your home in Swansea and Neath Port Talbot we agree what you need: bedroom count, bathroom, kitchen space, and how much garden you want to keep.
Get it approved
Once you're happy with the design we submit it to the council for Swansea and Neath Port Talbot 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 it
The new structure goes up first, then we open into the house, finish inside and get the completion certificate.

Towns we cover in Swansea and Neath Port Talbot

Two-storey wraparound extensions in Swansea and Neath Port Talbot: questions

How much does a two-storey wraparound extension cost in Swansea and Neath Port Talbot?

In Wales our guide is £1,980–£2,710 per m² including VAT, so about £111,000–£152,000 for an L-shaped footprint of about 28 m² wrapping the side and rear, on two floors (56 m² of new floor space). Essential and Premium specs move that by roughly 8% down or 20% up.

How much floor space does a wraparound extension add?

It depends on the width of the side plot and the depth at the rear. Our guide prices are based on a typical wraparound with an L-shaped footprint of about 28 m² wrapping the side and rear, on two floors (56 m² of new floor space). Yours may be larger or smaller, and the measured survey shows what your plot can take.

Can I stay at home during a wraparound extension?

Many people do, but a wraparound affects two sides of the house and usually the kitchen, so there will be weeks without a full kitchen. We plan a temporary kitchen, keep a route through the house and seal off the work area. For some families, moving out while the rear wall is opened up is easier.

Does a wraparound extension need steel?

Almost always. Opening the corner of the house and the old rear wall to make one open-plan space means steel beams, and often a steel post or frame at the outside corner. The structural engineer sizes these, and the steel is ordered once the design is fixed, which is one reason a wraparound needs careful sequencing.

Will I need planning permission in Swansea and Neath Port Talbot?

Swansea and Neath Port Talbot is in Wales. Usually needs planning permission, because the combined side and rear works rarely meet every permitted development test.

Neighbouring areas

All extension services in Swansea and Neath Port Talbot · About two-storey wraparound extensions