Portland, Dorset
Terraced house rear extension in Portland
Rear and side return extensions for terraces, with access through the house and two neighbours. If you live in Portland and want to know what a terraced house rear extension would cost and whether it needs planning, start with the online guide price or a free site visit.
Portland and its postcode districts DT5 are part of our Dorset coverage. On a Portland terrace both neighbours usually need party wall notices or agreement, so we talk to them early.
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 Portland?
In Portland, our guide for a terraced house rear extension is £2,130–£3,430 per square metre including VAT for a standard specification. South West prices run slightly above our West Midlands baseline; natural stone to match the house is the main variable.
| Size | Guide price inc VAT |
|---|---|
| 3 m wide × 4.5 m deep (13.5 m²) | £29,000–£46,500 |
| 3 m wide × 6 m deep (18 m²) | £38,500–£62,000 |
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 terraced house rear extension in Portland?
Whether your terraced house rear extension in Portland needs a planning application depends on its size, your house and any local restrictions.
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.
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. We check your house's planning history and any conservation area before drawing, so the route is clear before you spend on plans.
What are homes in Portland like to extend?
Stone-built and rendered houses are common around Portland, so matching the walling is a design decision in its own right: natural stone, reconstituted stone or a render finish across old and new.
How a terraced house rear extension in Portland comes together
Look round and measure
A free visit to see the back of the house, measure it, check the drains and boundaries and hear what you need.
Drawings and budget
Floor plans and elevations for the options, each with a guide price.
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.
Terraced house rear extensions near Portland
From Portland, the nearest places we also cover are Weymouth (3.3 miles) and Dorchester (10.3 miles).
- Terraced house rear extension in Weymouth
- Terraced house rear extension in Dorchester
- Terraced house rear extension in Bridport
- Terraced house rear extension in Swanage
- Terraced house rear extension in Poole
Other work in Portland:
FAQ
Terraced house rear extension questions in Portland
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.
How long does a rear extension take to build in Portland?
Most single-storey rear extensions take 10 to 16 weeks on site and two-storey extensions 16 to 26 weeks, after design and approvals.
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.
Can you match the brick or stone on my Portland house?
We source the closest match and show you samples before ordering; reclaimed materials are often the best match on older houses.
What postcode areas do you cover around Portland?
Including DT5, and the surrounding Dorset area.
Do you handle building control in Portland?
Yes. We apply to the council or a registered building control approver and hand over the completion certificate.