Merseyside
Rear extensions in Thornton-Cleveleys
From the first measured visit to building control sign-off, we handle rear extensions in Thornton-Cleveleys under one contract.
Thornton-Cleveleys is in Merseyside, with postcode districts including FY5, FY6 and FY7. The nearest places we also cover are Cleveleys (0.8 miles) and Poulton-le-Fylde (3.2 miles).
Book a free site visit
Tell us about the house and we'll call to arrange a free, no-obligation visit.
Rear extensions we build in Thornton-Cleveleys
- Single-storey rear extensions
- Two-storey rear extensions
- Kitchen-diner rear extensions
- Side return extensions
- Wraparound extensions
- Glazed and glass-box rear extensions
- Rear extensions for terraced houses
- Rear extensions for semi-detached houses
- Rear extensions for bungalows
- Rear extension plans and planning applications
Also available across Merseyside:
- Rear extensions for detached houses
- Flat-roof rear extensions
- Pitched and lean-to roof rear extensions
- Knocking through to a rear extension
- Roof lanterns and rooflights for rear extensions
- Permitted development rear extensions
- Larger home extension prior approval (England)
- Building Regulations for rear extensions
Rear extension prices in Thornton-Cleveleys
North West prices sit below our West Midlands baseline; access on terraced streets is the main variable.
| Example | Guide inc VAT |
|---|---|
| Single-storey, 3 m × 4 m (12 m²) | £21,500–£35,000 |
| Single-storey, 4 m × 6 m (24 m²) | £43,000–£70,000 |
| Two-storey, 3 m × 5 m footprint (30 m²) | £51,000–£76,000 |
| Side return, about 14 m² | £30,500–£50,000 |
| Wraparound, about 25 m² | £51,500–£84,500 |
What are homes in Thornton-Cleveleys like to extend?
Stone and brick terraces are common around Thornton-Cleveleys. Where houses back onto a ginnel or alley, deliveries can come in from the rear, which makes the build tidier.
Planning rules for Thornton-Cleveleys
Under England's householder permitted development rules you can usually add 3 metres at the back of an attached house, or 4 metres on a detached house, without a planning application, as long as the extension stays under 4 metres high and its eaves stay under 3 metres where it is within 2 metres of a boundary.
England also has the larger home extension route: a single-storey rear extension of up to 6 metres on an attached house or 8 metres on a detached house, after prior approval from the council. The council notifies your neighbours and has 42 days to decide; the fee is £249 (£310 for applications made from 8 December 2026). The route is not available on designated land such as conservation areas.
Planning and Building Regulations are separate in England: even a permitted development extension is inspected for foundations, drainage, structure, insulation, fire safety and ventilation, through the council or a registered building control approver, ending with a completion certificate.
Nearby towns
FAQ
Questions people ask
How much is a rear extension in Thornton-Cleveleys?
A 3 m × 4 m single-storey rear extension is about £21,500–£35,000 including VAT at our North West England guide rates; the written price follows a survey.
Do I need planning permission in Thornton-Cleveleys?
Often not for a single-storey rear extension of up to 3 metres (4 metres on a detached house) under permitted development, or up to 6 or 8 metres with prior approval, unless the house is in a conservation area or its rights have been removed.
Is the site visit in Thornton-Cleveleys free?
Yes, with no obligation.
Do I need a party wall agreement?
In England, usually yes if the extension is on or near a shared boundary or the foundations are close to a neighbour's building. We serve the notices.