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Homes with an annex for sale: where to find one and what they cost
About one house in 45 listed for sale this autumn mentioned an annex. Where they're most common, where they're cheapest, what they cost, and the council tax, planning and mortgage questions to ask before you buy one.
- Under £300,000
- 356
- £300,000 to £500,000
- 1,537
- £500,000 to £750,000
- 2,043
- £750,000 to £1 million
- 1,538
In this article
Published 4 November 2026, from houses listed for sale on home.co.uk between 3 August and 1 November.
Homes with an annex are rare. Of the 338,699 houses listed for sale on home.co.uk in those three months, 7,586 mentioned an annex in their description: about one in 45. The typical one was a four-bedroom detached house with an asking price of £700,000, but there are cheaper ones, especially in Wales, Lincolnshire, Doncaster and Teesside.
What a home with an annex costs
| Asking price | Homes mentioning an annex |
|---|---|
| Under £300,000 | 356 |
| £300,000 to £500,000 | 1,537 |
| £500,000 to £750,000 | 2,043 |
| £750,000 to £1 million | 1,538 |
| Over £1 million | 2,112 |
Nearly two in three (65%) were detached houses. A quarter cost under £500,000.
Where annexes are most common
Out of postcode areas with at least 1,000 houses listed, these had the highest share mentioning an annex:
| Postcode area | Share of houses mentioning an annex | Typical price |
|---|---|---|
| Bournemouth (BH) | 4.6% | £750,000 |
| Tonbridge and Tunbridge Wells (TN) | 4.4% | £895,000 |
| Dorchester (DT) | 4.4% | £682,500 |
| Shrewsbury and mid Wales (SY) | 4.3% | about £600,000 |
| Plymouth and east Cornwall (PL) | 4.2% | £595,000 |
| Hereford (HR) | 4.1% | £595,000 |
| Redhill and Crawley (RH) | 4.1% | £1,000,000 |
| Slough (SL) | 4.0% | £1,410,000 |
| Chelmsford (CM) | 4.0% | £815,000 |
That's about twice the average across all houses (2.2%).
Where homes with an annex cost least
These postcode areas, each with at least 30 homes mentioning an annex, had the lowest typical asking price:
| Postcode area | Typical price | Homes mentioning an annex |
|---|---|---|
| Cleveland and Teesside (TS) | £450,000 | 32 |
| North Wales (LL) | £495,000 | 91 |
| Swansea and west Wales (SA) | £495,000 | 100 |
| Doncaster (DN) | £500,000 | 77 |
| Lincoln (LN) | £500,000 | 82 |
| Cardiff (CF) | £509,950 | 57 |
Homes with an annex for sale now
These were for sale on home.co.uk when we checked on 3 November 2026, all £450,000 or less and described as having a self-contained or separate annex. Homes sell, so they may have gone by the time you read this.
- 2-bed detached house with annex, Aberoer, Wrexham: £310,000
- 3-bed detached house with annex, Pentewan, St Austell: £375,000
- 4-bed detached house with annex, Ducie Lane, Bole, Retford: £399,950
- 6-bed detached house with annex, Llechryd, Cardigan: £425,000
- 5-bed detached house with annex, Church Lane, Willoughby, Lincolnshire: £440,000
- 5-bed semi-detached house with annex, Quantock Rise, Pawlett, Somerset: £450,000
To find more, search homes for sale in the area you want and look for "annex" or "annexe" in the description.
What to check before you buy a home with an annex
- What "annex" means in this listing. It can be anything from a converted garage with a shower room to a fully separate cottage. Ask whether it has its own kitchen, bathroom and entrance, and look at the floor plan.
- Planning permission and conditions. Ask whether the annex had planning permission, and whether a condition ties it to the main house, for example that it can only be lived in by family or can't be sold or let separately. Your conveyancer should check.
- Council tax. In England, an annex usually gets its own council tax bill. The government's council tax guide says you may get a 50% discount if you use it as part of your main home, and that it's fully exempt if a dependant relative lives in it as their main home: someone aged 65 or over, substantially or permanently disabled, or severely mentally impaired. A 2013 regulation also gives a 50% discount when a relative lives in it. Wales and Scotland have their own rules, so ask your council.
- Stamp duty. HMRC treats an annex in the same building or grounds as "subsidiary" to the main house when the main house accounts for at least two-thirds of the price, which affects whether the higher rates apply. See HMRC's guide to the higher rates and ask your conveyancer before you exchange. In Wales, Land Transaction Tax applies instead, with its own rules.
- Your mortgage. Tell your lender or broker about the annex early. Some treat a self-contained annex differently, especially if it might be let.
- A survey. Get the annex surveyed along with the main house. It may have been built or converted to a different standard.
For more on buying, see our guide to buying a home.
How we worked this out
We took every house listed for sale on home.co.uk between 3 August and 1 November 2026, counting each home once: 338,699 houses. Flats, maisonettes, retirement homes, park homes, plots and garages are left out. A home counts as having an annex if its description uses the word "annex" or "annexe". That includes some listings that mention space for one or permission to build one, so the true number with a finished annex is a little lower. Typical prices are medians, the middle asking price. Postcode areas are the letters at the start of a postcode, so each covers a town and the countryside around it.
More in Buying a home: the Home guide
Frequently asked questions
How many homes for sale have an annex?
About one house in 45. Of the 338,699 houses listed on home.co.uk between 3 August and 1 November 2026, 7,586 mentioned an annex in their description.
How much does a house with an annex cost?
The typical asking price was £700,000, but a quarter were under £500,000 and 356 were under £300,000.
Where can I find a cheap house with an annex?
In our data the lowest typical prices were in the Cleveland and Teesside (TS), north Wales (LL), Swansea and west Wales (SA), Doncaster (DN) and Lincoln (LN) postcode areas, at around £450,000 to £500,000.
Do you pay council tax on a granny annex?
In England, usually yes, as a separate bill. You may get a 50% discount if you use it as part of your main home or a relative lives there, and it's exempt if a dependant relative, such as someone aged 65 or over, lives in it as their main home. Wales and Scotland have their own rules, so check with your council.
Sources
- Paying the right level of Council Tax: a plain English guide (annexes). UK Government. Accessed 3 November 2026.
- SDLTM09766: higher rates, purchasing two or more dwellings. HM Revenue and Customs. Accessed 3 November 2026.
- The Council Tax (Reductions for Annexes) (England) Regulations 2013. legislation.gov.uk. Accessed 3 November 2026.
- Higher rates of Stamp Duty Land Tax. HM Revenue and Customs. Accessed 3 November 2026.
- Home.co.uk analysis of houses listed for sale, 3 August to 1 November 2026 (method on this page). home.co.uk. Accessed 3 November 2026.
