St Helens, Merseyside
Bungalow rear extension in St Helens
Single-storey rear extensions that keep everything on one level. We design, get the approvals for and build rear extensions for bungalows in St Helens and the surrounding area, with one contract from the first survey to building control sign-off.
St Helens and its postcode districts WA9, WA10 and WA11 are part of our Merseyside coverage. For bungalows in Merseyside, a rear extension is the usual way to add space without adding stairs.
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 bungalow rear extension cost in St Helens?
For St Helens we work from the North West England rate: £1,740–£2,820 per square metre of new floor, including VAT, standard specification. North West prices sit below our West Midlands baseline; access on terraced streets is the main variable.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4 m deep (12 m²) | £21,000–£34,000 |
| 4 m wide × 6 m deep (24 m²) | £41,500–£67,500 |
Ground conditions, glazing, the roof and how far the house is opened up move the final figure within the range.
Do you need planning permission for a bungalow rear extension in St Helens?
Whether your bungalow rear extension in St Helens needs a planning application depends on its size, your house and any local restrictions.
English permitted development (Class A) allows a single-storey rear extension of 3 metres on a terraced or semi-detached house and 4 metres on a detached one, measured from the original house, with a maximum height of 4 metres and eaves of no more than 3 metres within 2 metres of a boundary.
If 3 or 4 metres is not enough, England's prior approval route allows 6 metres on a terraced or semi-detached house and 8 metres on a detached house for a single-storey rear extension. Neighbours are consulted, the council decides within 42 days, and the fee is £249, rising to £310 from 8 December 2026.
Conservation areas, National Parks, National Landscapes and the Broads restrict permitted development, and listed buildings always need listed building consent. At the first visit we measure what is there now and tell you which route fits: permitted development, prior approval or a planning application.
What are homes in St Helens like to extend?
St Helens has long runs of terraced houses with back yards and alleys, plus 1930s semis further out. Yard extensions on terraces are often single-storey and close to both boundaries.
How a bungalow rear extension in St Helens 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.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
Paperwork handled
Planning, prior approval or permitted development, Building Regulations approval, structural design and party wall notices are all handled by us.
Build and sign-off
We build to the approved drawings with regular updates, then hand over the building control completion certificate and any guarantees from suppliers.
Bungalow rear extensions near St Helens
We also build rear extensions for bungalows in nearby Haydock (2.4 miles) and Rainhill (2.7 miles).
- Bungalow rear extension in Haydock
- Bungalow rear extension in Rainhill
- Bungalow rear extension in Whiston
- Bungalow rear extension in Prescot
- Bungalow rear extension in Ashton in Makerfield
Other work in St Helens:
FAQ
Bungalow rear extension questions in St Helens
Do you handle building control in St Helens?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.
How long does a rear extension take to build in St Helens?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
Can a bungalow extension be fully accessible?
Yes: level thresholds, wider doors and a wet room are straightforward to design in.
Is the site visit in St Helens free?
Yes. We visit, measure up and talk through the options with no cost and no obligation.
Can you match the brick or stone on my St Helens house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
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.