Does an annexe count as a separate home for stamp duty?
Separate homes inside one building
HMRC looks at whether an area has everyday living facilities, independent enough access and real privacy from the rest of the building.
- A studio layout can still be a separate home.
- Kitchen infrastructure can matter more than removable appliances.
- Access through private rooms can prevent separation.
Scroll down for the full analysis.
Read the original guidance here:
Does an annexe count as a separate home for stamp duty?
Names alone do not create separate homes. The rooms, entrance and privacy are what matter. Those features can affect the SDLT treatment of your purchase.
What this rule is about
More than one home can exist within a single building. Equally, a house with additional rooms may still be one home. The position depends on what existed when you bought it.
This matters where the number of homes in a purchase affects stamp duty treatment. A label in a sales brochure will not determine the issue.
Finance Act 2003 says that a building, including part of a building, may be residential property if it is used or suitable for use as a home.
It provides no room-by-room checklist for deciding whether an annexe is separate.
What the official source says
HMRC’s manual explains its view. It describes the physical features it expects to find. HMRC looks for somewhere a person can meet basic daily needs, with sufficient separation from the rest of the building.
- A sleeping area would normally have light, power, a window and reasonable space.
- A living area normally needs room for furniture and visitors, with heating, light, power and a window.
- Private washing and toilet facilities are normally needed: usually a bath or shower, toilet and sink.
- Food preparation and eating need space, plumbing and power for kitchen equipment.
- Cookers, fridges and dishwashers may be absent.
- A studio can still qualify even if sleeping and living space are in one room.
- Access should be sufficiently independent, such as from outside or from genuine shared halls and stairs.
- A lockable door from a common hall can support separation.
- In HMRC’s view, access through the main home’s hall or living rooms will usually count against a separate home.
- Connecting doors, and whether they can be secured from both sides, also matter.
What this means in practice
Consider whether someone could sleep, wash, use the toilet, prepare food and live there without regularly passing through another person’s private space to reach essential facilities or leave the area. That is the test.
A separate postal address or council tax record may support your position if the layout, facilities, access and privacy also indicate a distinct home, but neither is sufficient by itself. They do not decide it.
- Check the layout on the day you complete, not a planned future layout.
- Keep dated pictures if fittings, doors or access routes may later change.
- Look beyond furniture that a seller may remove before completion.
- Focus on fixed features, such as plumbing, wiring, locks and walls.
How to analyse it
Start with the building as a whole, then examine the area said to be separate. Do not begin with the word “annexe”. It can describe anything from a bedroom suite to a self-contained flat.
- Identify the exact area said to be a separate home.
- List its sleeping, living, washing, toilet and food-preparation facilities.
- Check whether kitchen services were installed, even if appliances were missing.
- Trace the route from outside to that area.
- Ask whether that route crosses another household’s private rooms.
- Check every internal connecting door and whether it locks securely on both sides.
- Consider whether the layout gives both sides normal privacy and security.
- Record the evidence as it stood at completion.
Example
Amir buys a house with rooms above the garage. Those rooms include a bedroom, sitting room, shower room and toilet. They also include a fitted kitchen area with a sink, plumbing and cooker point.
A locked door opens onto a shared entrance hall, and then to the outside. On HMRC’s approach, those facts point towards a separate home.
Change one detail: if everyone has to pass through the main house’s living room to reach the stairs, the lack of privacy points the other way.
Why this can be difficult in practice
An annexe may contain most facilities but still share a hallway, kitchen, or a door that is never locked, so the overall arrangement falls short of the separation HMRC expects. Small details matter.
HMRC’s manual is guidance rather than law. Its list is useful, but it is not a box-ticking test. The overall condition, layout, access and degree of separation must all be considered.
- A usable bedroom alone does not create a separate home.
- A missing cooker is not decisive if the kitchen infrastructure remains.
- Several open or insecure connecting doors can weaken the case for separation.
- A shared hall may be different from walking through a family’s private living space.
- Later building works may prove little about the layout when you bought the property.
Key takeaways
- Facilities, access and privacy all matter.
- HMRC’s list is guidance, not an automatic test.
- Keep evidence of the layout at completion.
Technical analysis
For advisers, and for anyone who wants to check the law behind this page. You do not need this section to understand the guidance above.
Legislation
- FA 2003 section 116 — when property is residential for SDLT
Official guidance
The pages below are HMRC’s guidance. Guidance is not law. It sets out how HMRC reads the legislation, and it is not binding on you, on a tribunal or on a court. Where guidance and the legislation differ, the legislation wins. HMRC can also change or withdraw guidance, and it may not cover your facts.
Where this is not settled
- There is no fixed statutory checklist for deciding whether two parts of one building are separate homes.
- The weight given to shared access, connecting doors and privacy depends on the whole layout and the facts at completion.
- A property description, council tax entry or an estate agent’s label will not by itself settle the question.
Evidence you would need
This kind of case is decided on the facts of the individual property. These are the records that usually settle it, and the ones an adviser would ask you for.
- Dated photographs and video from completion — the rooms, fittings, doors and access as they actually were
- Measured floor plans for the whole building — the room layout, internal links and route to each part
- Estate agent particulars and sales brochure — how the property was described and marketed at the time
- Land Registry title and filed plan — the land bought and any rights needed to reach the area
- Planning history and building control records — approved works, changes of use and completed alterations
- Room-by-room record of use at completion — how each space was being used when the purchase took effect
- Utility meter records and installation documents — whether services were separately supplied or shared
- Kitchen and bathroom fitting invoices or surveys — whether washing, toilet and food-preparation facilities existed
- Door photographs and fire-door specifications — whether connecting doors could be locked and provide separation
Explore this with an AI
Readers often want to test their own situation. Copy the prompt below into ChatGPT, Claude or Gemini. It hands the model the actual legislation for this page rather than letting it answer from memory, and tells it to be explicit about what is uncertain. What comes back is information, not advice – check it against the links above.
I am researching UK Stamp Duty Land Tax (SDLT), which applies in England and Northern Ireland. MY QUESTION Does an annexe count as a separate home for stamp duty? [Replace this with your own situation: what you are buying, the price, the dates, who the buyer is, and what you plan to do with the property.] THE LAW THIS TURNS ON - FA 2003 section 116 - when property is residential for SDLT https://www.legislation.gov.uk/ukpga/2003/14/section/116/2025-11-17 Guidance page from HMRC on this topic (guidance, not law): https://www.gov.uk/hmrc-internal-manuals/stamp-duty-land-tax-manual/sdltm00425 HOW I WANT YOU TO ANSWER 1. Work from the legislation above. Read it before answering. Guidance from HMRC is its view of the law, not the law, and does not bind a tribunal or a court. 2. Tell me what the rule actually requires, in plain English. 3. Tell me which facts decide the answer, and which facts would change it. 4. Tell me what evidence I would need to support the position. 5. Be explicit about anything unsettled or fact-sensitive. Do not guess. 6. Your training data has a cutoff and SDLT rates and reliefs change at fiscal events. Say so if you are not sure the law is current. POINTS ALREADY KNOWN TO BE UNCERTAIN ON THIS TOPIC - There is no fixed statutory checklist for deciding whether two parts of one building are separate homes. - The weight given to shared access, connecting doors and privacy depends on the whole layout and the facts at completion. - A property description, council tax entry or an estate agent's label will not by itself settle the question. Do not give me a conclusion you cannot support from the provisions above.
Legislation links show Finance Act 2003 as it stood on 2025-11-17. The law may have changed since, and the rules that apply are those in force on the date of your transaction. The official guidance this page is based on is here.
This page was last updated on 31 August 2026
Useful article? You may find it helpful to read the original guidance here: Does an annexe count as a separate home for stamp duty?
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