Buying Your Own Flat's Freehold: Does the SDLT Surcharge Apply?

Just over one in five homes in England and Wales — 3.73 million of the 16.54 million properties in Homecost's Land Registry-linked database (fetched 14 September 2026) — are sold on a lease rather than a freehold. Flats make up the overwhelming majority of that leasehold stock: 2.71 million of England and Wales's 2.78 million flats are leasehold, and 155,001 leasehold flats changed hands in 2025 alone, at an average price of £318,792.

A share of those leaseholders eventually look at buying out the freeholder, either alone or as a group, rather than watching their lease term run down. When they do, the same question comes up almost every time: because the buyer already owns a home, does HM Revenue & Customs' 5% stamp duty surcharge for additional properties apply to the price paid for the freehold?

What the surcharge is actually testing

The higher rates for additional dwellings — 5% on top of standard Stamp Duty Land Tax (SDLT) rates, set out in Finance Act 2003, Schedule 4ZA — is charged when a buyer who already holds a "major interest" (broadly, a freehold or a lease with more than seven years left) in one dwelling acquires a major interest in a second, different dwelling. The test is about the number of separate dwellings a buyer holds an interest in, not the number of transactions they make or the amount of money changing hands.

That distinction matters here. A leaseholder buying the freehold of the flat they already live in isn't acquiring an interest in a different property — they're acquiring a further interest in the same one. HMRC applies this same logic to leaseholders who extend their own lease: because the flat being extended is the identical dwelling the leaseholder already holds a major interest in, no additional dwelling has been acquired, so the surcharge doesn't apply. Buying the freehold reversion of that same flat sits on the same footing — the dwelling doesn't change, only the nature of the interest held in it does.

Two routes to the same outcome

Individual leaseholders in houses, and small numbers of leaseholders in low-rise blocks, sometimes buy their freehold (or a share of it) directly, in a transaction that functions much like a lease extension. In larger blocks, the more common route is collective enfranchisement under the Leasehold Reform, Housing and Urban Development Act 1993: a qualifying majority of leaseholders club together, typically through a nominee purchaser company, to buy the freehold of the whole building.

Where the freehold is bought through a company vehicle, the SDLT position for the company's acquisition is a separate question from any individual leaseholder's own surcharge status, and carries its own rules on corporate purchases of residential property. Anyone going down the collective route should get a written SDLT position from a solicitor experienced in enfranchisement work as part of the transaction, rather than assume the individual-buyer logic above automatically carries across to the purchasing vehicle.

What the numbers look like

Enfranchisement premiums are calculated individually — based on the unexpired lease term, ground rent and a RICS valuer's assessment of the flat — so there's no single "typical" figure to quote. Homecost's stamp duty tool can run the maths for both the correct SDLT treatment and, for comparison, the surcharged rate a leaseholder might be wrongly quoted:

At every level shown, correctly treating the purchase as a further interest in an existing dwelling means no SDLT is due at all, because the premium sits inside the nil-rate band. Being charged as if it were an additional property would add a bill that scales with the premium at 5p in every pound — a meaningful, entirely avoidable cost if the wrong box gets ticked on the SDLT return.

Where it gets more complicated

Two situations sit outside the simple case above. First, if the block being enfranchised includes flats owned by leaseholders who chose not to participate, or commercial units within the same building, those non-participating interests are treated separately and can bring mixed-use or apportionment questions into play. Second, a leaseholder who separately owns another, unconnected residential property is not affected in respect of this transaction — the surcharge test looks at whether the interest being bought adds a new dwelling, not at what else the buyer already owns.

Because enfranchisement premiums, lease terms and building structures vary case by case, this is general information about how the rules work, not a determination of what any individual buyer will pay. Check a postcode's true cost, including how SDLT is calculated under different scenarios, and speak to a solicitor and a RICS valuer experienced in enfranchisement before agreeing a premium or filing a return. It's also worth reading why the additional-property surcharge has no upper limit while first-time buyer relief does, or the basics of freehold versus leasehold ownership if you're weighing up a leasehold purchase in the first place.

Figures above are calculated using Homecost's stamp duty tool against HMRC's published SDLT rate tables (fetched 14 September 2026); leasehold housing-stock and sale figures are drawn from HM Land Registry price-paid records covering 16.54 million properties, browsable alongside Homecost's other cost-intelligence guides.

This is general information, not advice. Speak to a qualified adviser before acting.