Llanelli, West Wales
Side return extension in Llanelli
Infilling the narrow passage beside a Victorian or Edwardian back addition. If you live in Llanelli and want to know what a side return extension would cost and whether it needs planning, start with the online guide price or a free site visit.
We cover Llanelli (SA15) as part of our West Wales work. In Llanelli 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 Llanelli?
In Llanelli, our guide for a side return extension is £2,140–£3,530 per square metre including VAT for a 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 Llanelli?
Here is how the rules in Wales apply to a side return extension in Llanelli.
In Wales a single-storey side extension can be permitted development if it is no more than 4 metres high and the house ends up no more than 50% wider than the original. Many side return infills on terraced streets, and most wraparounds, go through a householder application.
The Party Wall etc. Act 1996 also applies in Wales: two months' notice for work to a shared wall and one month for foundations dug close to a neighbour's building.
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 Llanelli like to extend?
Older terraces near the centre and post-war semis further out are typical of Llanelli. Sloping sites are common in Wales, so floor levels and retaining walls are designed at the start.
How a side return extension in Llanelli 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.
Planning and regulations
We take the design through the right planning route, then produce the construction drawings and engineer's calculations for building control.
Written price, then build
Once the design and approvals are in place, you get a fixed written price and programme, and we build through to sign-off.
Side return extensions near Llanelli
Neighbouring places we cover include Gorseinon (5.2 miles) and Swansea (10.3 miles).
- Side return extension in Gorseinon
- Side return extension in Swansea
- Side return extension in Ammanford
- Side return extension in Clydach
- Side return extension in Carmarthen
Other work in Llanelli:
FAQ
Side return extension questions in Llanelli
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 live at home while the extension is built?
Usually yes. Most of the work is outside until the back wall is opened near the end, and that stage is screened off.
Glass roof or solid roof with rooflights?
A glass roof gives the most light; a solid roof with long rooflights is warmer and quieter in rain. Both work.
Do you handle building control in Llanelli?
Yes. We apply to the council or a registered approver under the Welsh regulations and hand over the completion certificate.
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.
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.