End of Terrace Loft Conversion
An end of terrace house sits at the end of a row, sharing a wall with just one neighbour rather than two. This makes the party wall process simpler than a mid terrace home, but it is worth knowing straight away that this is where the similarities with a semi detached house end. For planning purposes, an end of terrace is still classed as a terraced house, not a semi detached one, which matters more than people expect.
The reason it matters is the permitted development volume allowance. Semi detached and detached houses get up to fifty cubic metres of additional roof space without needing full planning permission. Terraced houses, including end of terrace properties, only get forty cubic metres, even though you are only dealing with one shared wall rather than two. It catches some homeowners out, since it is easy to assume one party wall means the same rules as a semi detached house, and that is not the case.
What an end of terrace house often does offer is an exposed side elevation that a mid terrace house simply does not have. Some end of terrace properties have a hipped roof on that side, which can suit a hip to gable conversion in the same way it would on a semi detached house, and the side wall itself can sometimes bring in extra natural light that a fully enclosed mid terrace loft cannot.
Who this for
This service suits end of terrace houses of most ages, particularly Victorian and Edwardian terraces with a low, flat London roof, as well as newer terraces with a hipped side elevation. It is worth a survey any time you are not sure whether your house counts as a mid terrace or an end of terrace for planning purposes, since the difference affects your volume allowance and your options.
End of Terrace Loft Conversion Cost
Costs for an end of terrace loft conversion tend to fall between what you would expect for a mid terrace house and a semi detached one. Where the hipped side allows for a hip to gable conversion, this typically runs £55,000 to £85,000. A standard rear dormer, which remains an option regardless of the side elevation, generally costs £60,000 to £80,000 in London. Across all types, London loft conversions in 2026 commonly range from £50,000 to £120,000 or more including VAT, with the exact figure depending heavily on which technique your specific roof suits. London and the South East generally run 20 to 40 percent above the UK average, so these figures already reflect that premium rather than a lower national baseline. Because your permitted development allowance is capped at forty cubic metres, and any previous roof work on the house counts against that total, it is worth checking what has already been built before pricing up a new project. Get in touch for a free survey, we will check your planning history as well as your roof.
Project Process Steps
We confirm your permitted development status, checking whether the property has already used part of its forty cubic metre allowance through previous work, since this affects what is realistically achievable.
We survey the side elevation as well as the rear roof, since an end of terrace house may have a hipped side that mid terrace houses do not, opening up a hip to gable option alongside the usual dormer choice.
We issue a party wall notice to the one neighbouring property affected, which is more straightforward than the two agreements a mid terrace project usually needs.
Once the design and planning position are agreed, the build proceeds through the usual roof structure, weatherproofing and interior stages.
Frequently asked questions (FAQ)
Does an end of terrace house get the same permitted development allowance as a semi detached house?
No, and this catches a lot of homeowners out. Even though you only share one wall with a neighbour, an end of terrace house is still classed as a terraced house for planning purposes, which means a forty cubic metre allowance rather than the fifty cubic metres a semi detached or detached house gets.
How many party wall agreements do I need for an end of terrace house?
Usually just one, since you only share a wall with the neighbour on one side. This is simpler than a mid terrace project, which typically needs agreements with two separate households.
Can an end of terrace house have a hip to gable conversion?
Sometimes, yes, if the exposed side of the roof is hipped rather than a straight gable already. This is one of the genuine advantages of an end of terrace property over a mid terrace one, since a fully enclosed mid terrace house does not have a side roof slope available to work with in this way.
Does my previous loft or roof work affect what I can do now?
Yes. The forty cubic metre permitted development allowance is not reset each time you do work, it applies over the lifetime of the house. If a previous owner or an earlier project already used part of that allowance, less is available for your current plans, so it is worth checking the property's history before assuming the full allowance is available.
What if my end of terrace house is on a corner plot?
Corner plots need extra care, since a side elevation facing a road can be treated as a principal elevation, similar to the front of the house. This can affect what permitted development allows on that side, so it is worth checking with your council or getting a Lawful Development Certificate before assuming the standard rules apply.