Abergavenny, Newport and Monmouthshire
Side return extension in Abergavenny
Infilling the narrow passage beside a Victorian or Edwardian back addition. We design, get the approvals for and build side return extensions in Abergavenny and the surrounding area, with one contract from the first survey to building control sign-off.
Abergavenny and its postcode districts NP7 are part of our Newport and Monmouthshire coverage. In Abergavenny we check the boundary line and the neighbour's gutter before drawing a side return, because a few centimetres decide whether the wall goes on or beside the boundary.
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
How much does a side return extension cost in Abergavenny?
For Abergavenny we work from the Wales rate: £2,140–£3,530 per square metre of new floor, including VAT, standard specification. Prices in Wales sit below our West Midlands baseline; sloping sites are the main variable.
| Size | Guide price inc VAT |
|---|---|
| 2 m wide × 6 m deep (12 m²) | £25,500–£42,500 |
| 2.5 m wide × 7 m deep (17.5 m²) | £37,500–£62,000 |
These are guide ranges; the written quote after the survey is the figure that counts.
Do you need planning permission for a side return extension in Abergavenny?
Whether your side return extension in Abergavenny needs a planning application depends on its size, your house and any local restrictions.
Welsh side-extension rules limit a single-storey side addition to 4 metres high and a 50% increase in the width of the original house, with tighter limits in conservation areas. Wraparounds usually need a planning application.
In Wales, as in England, the Party Wall etc. Act 1996 requires notice to neighbours before work to a shared wall or excavation near their foundations.
Conservation areas, National Parks and National Landscapes restrict permitted development in Wales, and listed buildings need listed building consent. At the first visit we measure what is there now and tell you which route fits: permitted development or a householder planning application.
What are homes in Abergavenny like to extend?
Older terraces near the centre and post-war semis further out are typical of Abergavenny. Sloping sites are common in Wales, so floor levels and retaining walls are designed at the start.
How a side return extension in Abergavenny comes together
Survey visit
We visit free of charge, measure up, check access, drainage and neighbours' extensions, and note what you want the room to do.
Options and costs
We draw layout options and price each one, so the budget shapes the design rather than surprising you later.
Approvals
Permitted development check or householder planning application, then Building Regulations drawings to the Welsh Approved Documents and structural calculations, plus party wall notices where they apply.
Fixed price and build
A written price for the agreed design, a start date and a named contact through the build, ending with the building control completion certificate.
Side return extensions near Abergavenny
From Abergavenny, the nearest places we also cover are Brynmawr (7.2 miles) and Abertillery (8.0 miles).
- Side return extension in Brynmawr
- Side return extension in Abertillery
- Side return extension in Pontypool
- Side return extension in Ebbw Vale
- Side return extension in Tredegar
Other work in Abergavenny:
FAQ
Side return extension questions in Abergavenny
Can you match the brick or stone on my Abergavenny house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
How long does a rear extension take to build in Abergavenny?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
Where does the drainage go?
Side passages often carry the soil and rainwater pipes. We survey them first and reroute them under the new floor where needed.
Do I need a party wall agreement?
In Wales, usually yes if the extension is on or near a shared boundary or close to a neighbour's foundations. We serve the notices.
Will I need a structural engineer?
Yes for the beam over the new opening and usually the foundations; we arrange them and their calculations go to building control.
Can I get a price without a visit?
Our online guide-price tool gives a range in a couple of minutes. A written price needs a survey.