Knotty Ash, Merseyside
Terraced house rear extension in Knotty Ash
Thinking about a terraced house rear extension in Knotty Ash? Rear and side return extensions for terraces, with access through the house and two neighbours. Our team handles the drawings, the planning route and the build, and your contract is with one company throughout.
We cover Knotty Ash (L13, L14 and L16) as part of our Merseyside work. In Knotty Ash we plan the delivery route through the house and the skip licence before anything else.
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 terraced house rear extension cost in Knotty Ash?
In Knotty Ash, our guide for a terraced house rear extension is £1,930–£3,100 per square metre including VAT for a 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 × 4.5 m deep (13.5 m²) | £26,000–£42,000 |
| 3 m wide × 6 m deep (18 m²) | £34,500–£56,000 |
Your written price follows a measured survey and an agreed design, so it reflects your house, not an average.
Do you need planning permission for a terraced house rear extension in Knotty Ash?
Here is how the rules in England apply to a terraced house rear extension in Knotty Ash.
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.
Because rear extensions often sit on or near the boundary, the Party Wall etc. Act 1996 usually applies in England. Notices go out one or two months before work depending on the type of work, and a surveyor's award is only needed if a neighbour does not consent.
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 Knotty Ash like to extend?
Stone and brick terraces are common around Knotty Ash. Where houses back onto a ginnel or alley, deliveries can come in from the rear, which makes the build tidier.
How a terraced house rear extension in Knotty Ash comes together
Free site visit
We measure the house and garden, look at the back wall, drainage and boundaries, and talk through what you want from the space.
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, prior approval or planning application, then Building Regulations drawings and structural calculations, plus party wall notices where they apply.
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.
Terraced house rear extensions near Knotty Ash
Close by, we work in Old Swan, about 0.5 miles away, and West Derby, about 1.3 miles away.
- Terraced house rear extension in Old Swan
- Terraced house rear extension in West Derby
- Terraced house rear extension in Childwall
- Terraced house rear extension in Wavertree
- Terraced house rear extension in Norris Green
Other work in Knotty Ash:
FAQ
Terraced house rear extension questions in Knotty Ash
Do I need planning permission for a rear extension in Knotty Ash?
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.
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.
How deep can I go on a terrace?
3 metres under permitted development in England, or up to 6 metres with prior approval outside designated land.
Who will build my extension?
Vetted building teams working under contract to us. Your contract is with S&K Property Investments and Improvement Ltd for the design and the build.
How much does a terraced house rear extension cost in Knotty Ash?
As a guide, £1,930–£3,100 per square metre including VAT for a standard specification. For example, 3 m wide × 4.5 m deep (13.5 m²): about £26,000–£42,000 at that rate. Your written price follows the survey.
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.