LTT: buying a home with an annexe after 7 February 2025
Buying a house with an annexe
From 7 February 2025, multiple dwellings relief is not available in specified LTT cases involving a subsidiary home where the main rates apply.
- Check whether the smaller home is subsidiary.
- Check the exchange and completion dates.
- Check for later changes to the contract.
- Check whether another purchase is linked.
Scroll down for the full analysis.
Read the original guidance here:
LTT: buying a home with an annexe after 7 February 2025
If you buy a home in Wales with an annexe, cottage or flat, a valuable LTT relief may no longer be available. From 7 February 2025, the 2025 Regulations can apply where the smaller home meets the subsidiary-home test and the main LTT rates apply. That can increase the tax due.
What this rule is about
Land Transaction Tax is Wales’s version of stamp duty. Multiple dwellings relief can reduce LTT. It applies when someone buys more than one home in the same purchase.
But not every separate-looking home counts separately. A small home within the grounds of, or in the same building as, the main home may be a subsidiary home. Those 2025 Regulations changed how that affects the relief.
This is the part people can miss: an annexe may be useful, rentable or have its own entrance, but that does not settle the tax result.
What the official source says
For purchases effective after 7 February 2025, you cannot claim multiple dwellings relief where the subsidiary dwelling exception applies and the main rates of LTT apply.
- It started on 7 February 2025.
- It concerns a purchase involving a main home and a subsidiary home.
- You cannot use the relief where the main LTT rates apply.
- A home may be subsidiary if it stands in the grounds of another bought home, or if both homes occupy one and the same building.
- Their value split matters under the statutory test.
- Official guidance provides neither a new LTT rate nor a new tax band.
Here, the point is not that the smaller home disappears. Treat both as one home for relief.
What this means in practice
Buying a house with an annexe is no longer enough, by itself, to support this relief. First work out whether the annexe is subsidiary. Then work out whether the main rates apply to your purchase.
You might assume that two kitchens mean two homes for every LTT purpose. They do not.
- Do not base the LTT figure only on an estate agent’s description.
- Check whether the annexe sits within the main home’s grounds.
- Check whether both homes are within one building.
- Keep the valuation evidence used to divide the price between them.
- Tell your conveyancer about any contract change before completion.
- Check whether another purchase links to yours.
How to analyse it
Start with dates. The transition rules can matter just as much as the layout of the property.
- Find when the parties exchanged contracts.
- Find the completion date and the effective date of the purchase.
- Ask whether the purchase completed before 7 February 2025.
- If not, ask whether the parties exchanged contracts before that date.
- Check for a contract variation on or after 7 February 2025.
- Check for an assignment of rights, subsale or similar later deal.
- Check whether someone exercised an option, pre-emption right or similar right on or after that date.
- Work out whether the smaller home meets the subsidiary-home test.
- Check whether the main rates, rather than the higher rates, apply.
- Finally, check whether the purchase is linked to one effective before 7 February 2025.
A contract exchanged before the change and completed before it is not affected. A contract exchanged before the change but completed afterwards can also be protected, unless one of the listed later events occurs.
Example
On 20 January 2025, Aled exchanges contracts to buy a Welsh house and its annexe, with completion set under the contract for 10 February. Nothing in the contract changes after 7 February. No one assigns rights under the contract, and the purchase does not follow an option or similar right that was exercised after that date. Neither happens. The transition rules can mean that the 2025 change does not apply.
Change one fact: the parties vary the contract on 8 February 2025. The official source says the new Regulations can then apply. Those two questions decide the result.
Why this can be difficult in practice
These cases often turn on documents and timing, not simply on how the property is marketed. A small change to a contract can matter. So can the relationship between two linked purchases.
- An annexe may look separate but still be subsidiary for this rule.
- A pre-change exchange date does not always preserve the old treatment.
- A later variation can bring the new rule into play.
- Linked purchases need their effective dates checked separately.
- The facts behind a price split between homes may need clear evidence.
Official guidance comes from the Welsh Revenue Authority. The Regulations and the LTT Act are the law that decide the result.
Key takeaways
- The 2025 LTT change began on 7 February 2025.
- A home and subsidiary annexe may count as one for this relief.
- Exchange, completion and later contract changes can decide which rules apply.
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
- LTTA 2017 Schedule 13 para 3 — when relief for buying multiple homes is available
- LTTA 2017 Schedule 13 para 7A — subsidiary homes treated as one home for relief
- LTTA 2017 Schedule 5 para 14 — when one purchased home is subsidiary to another
- The Land Transaction Tax (Modification of Relief for Acquisitions Involving Multiple Dwellings) (Wales) Regulations 2025 reg. 2 — change removing relief in specified subsidiary home cases (could not parse a provision)
- The Land Transaction Tax (Modification of Relief for Acquisitions Involving Multiple Dwellings) (Wales) Regulations 2025 reg. 4 — transitional rules for contracts exchanged before the change (could not parse a provision)
- The Land Transaction Tax (Modification of Relief for Acquisitions Involving Multiple Dwellings) (Wales) Regulations 2025 reg. 5 — linked purchase rule for the 2025 changes (could not parse a provision)
Official guidance
The pages below are the Welsh Revenue Authority’s guidance. Guidance is not law. It sets out how the Welsh Revenue Authority 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. the Welsh Revenue Authority can also change or withdraw guidance, and it may not cover your facts.
Where this is not settled
- The supplied statutory bundle records later amendments from 13 February 2026. Confirm the current effect of this 2025 rule before relying on it for a new purchase.
- The official source does not set out every fact needed to decide whether a home is subsidiary in an individual case.
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.
- The signed contract and the date contracts were exchanged
- The completion date and any date the purchase became effective
- Any variation, assignment, option or pre-emption documents
- Documents showing whether another linked purchase is involved
- Plans, valuations and property details for the main home and annexe
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 Land Transaction Tax (LTT), the tax on property in Wales. It replaced Stamp Duty Land Tax in Wales on 1 April 2018, and SDLT does not apply in Wales. MY QUESTION LTT: buying a home with an annexe after 7 February 2025 [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 - LTTA 2017 Schedule 13 para 3 - when relief for buying multiple homes is available https://www.legislation.gov.uk/anaw/2017/1/schedule/13/paragraph/3 - LTTA 2017 Schedule 13 para 7A - subsidiary homes treated as one home for relief https://www.legislation.gov.uk/anaw/2017/1/schedule/13/paragraph/7A - LTTA 2017 Schedule 5 para 14 - when one purchased home is subsidiary to another https://www.legislation.gov.uk/anaw/2017/1/schedule/5/paragraph/14 Guidance page from the Welsh Revenue Authority on this topic (guidance, not law): https://www.gov.wales/land-transaction-tax-relief-acquisitions-involving-multiple-dwellings-technical-guidance#7268 HOW I WANT YOU TO ANSWER 1. Work from the legislation above. Read it before answering. Guidance from the Welsh Revenue Authority 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 - The supplied statutory bundle records later amendments from 13 February 2026. Confirm the current effect of this 2025 rule before relying on it for a new purchase. - The official source does not set out every fact needed to decide whether a home is subsidiary in an individual case. Do not give me a conclusion you cannot support from the provisions above.
Legislation links show the Land Transaction Tax and Anti-avoidance of Devolved Taxes (Wales) Act 2017 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 3 September 2026
Useful article? You may find it helpful to read the original guidance here: LTT: buying a home with an annexe after 7 February 2025
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