SDLT Planning for London Property Buyers: A 2026 Guide

Buying property in London is rarely a small financial commitment — and the Stamp Duty Land Tax (SDLT) that comes with it can be equally substantial. With London property prices among the highest in the country, SDLT bills routinely run into tens or even hundreds of thousands of pounds. Yet many buyers are unaware of the reliefs, structures, and planning opportunities that can legitimately reduce their liability.

This guide covers the key SDLT planning strategies for London property buyers in 2026, from residential purchases to commercial transactions, mixed-use properties, and portfolio acquisitions.

Understanding SDLT on London Residential Property

SDLT is charged on a tiered basis for residential property, with rates increasing as the purchase price rises. For additional residential properties (such as second homes and buy-to-let investments), a 3% surcharge applies on top of the standard rates.

For a £1 million London home, the standard SDLT bill is significant. For a £2 million property, it's even more so. And for buyers of additional properties, the surcharge adds further to the cost.

The Higher Rates for Additional Dwellings (HRAD)

If you're buying an additional residential property in London — whether as a buy-to-let investment, a holiday home, or accommodation for a family member — the 3% HRAD surcharge applies to the entire purchase price. This can add a substantial amount to the SDLT bill.

However, there are legitimate ways to plan around HRAD, particularly around the timing of replacements for a main residence. If you're selling your main home and buying a new one, the HRAD may not apply — even if you already own other properties.

Key SDLT Planning Strategies for London Buyers

1. Multiple Dwellings Relief (MDR)

If you're buying a property that contains two or more dwellings — such as a house with a self-contained annexe, or a building converted into flats — you may be able to claim Multiple Dwellings Relief. MDR calculates SDLT based on the average price of the dwellings rather than the total purchase price, which can result in significant savings.

MDR is particularly relevant for London buyers purchasing properties with ancillary accommodation, such as:

• Houses with self-contained granny annexes
• Buildings with separate flats above commercial premises
• Portfolios of multiple residential units

The rules around MDR changed following the 2024 Budget, so specialist advice is essential.

2. Mixed-Use Purchases

If a property transaction involves both residential and non-residential elements — such as a shop with a flat above, or a property with significant agricultural land — the entire transaction may be treated as non-residential for SDLT purposes. Non-residential rates are significantly lower than residential rates, and the 3% HRAD surcharge does not apply.

This is one of the most valuable SDLT planning opportunities for London buyers, but it requires careful analysis of the property and the transaction structure.

3. Company Structures for Property Portfolios

For buyers acquiring multiple London properties, holding them within a limited company can offer SDLT advantages in certain circumstances — particularly around the structure of the acquisition and the treatment of future transfers. However, the Annual Tax on Enveloped Dwellings (ATED) and the 15% SDLT rate for corporate purchases of residential property over £500,000 need to be carefully considered.

Read more about setting up a property company for buy-to-let to understand whether this structure is right for you.

4. Linked Transactions

Where multiple property transactions are linked — for example, buying several units in the same development from the same seller — the SDLT may be calculated differently. Understanding the linked transactions rules can help structure purchases efficiently.

5. Reliefs and Exemptions

There are numerous SDLT reliefs and exemptions available, including:

• Group relief for transfers within a group of companies
• Relief for transactions in substitution of a pre-existing contract (sub-sale relief)
• Charities relief
• Relief for compulsory purchase transactions
• First-time buyer's relief (for properties up to £625,000)

Each relief has specific conditions and eligibility requirements. A Chartered Tax Adviser can assess which apply to your transaction.

Common SDLT Pitfalls for London Buyers

Overpaying on Mixed-Use Properties

Many London property transactions are incorrectly classified as fully residential when they could qualify as mixed-use. This is particularly common for:

• Properties with commercial outbuildings or land
• Buildings with mixed residential and commercial use
• Properties with agricultural elements

A professional review of the transaction can identify these opportunities.

Missing MDR Opportunities

Properties with self-contained ancillary accommodation are frequently overlooked for MDR. If you're buying a London property with a separate dwelling — even a small one — it's worth having the transaction reviewed.

Incorrect HRAD Treatment

The 3% surcharge for additional dwellings is frequently applied incorrectly. If you're replacing your main residence, the timing and structure of the transactions matter. Specialist advice can ensure you're not overpaying.

How Newshams Can Help

Our SDLT advisory team specialises in helping London property buyers reduce their stamp duty liability through legitimate planning. We can:

• Review your property transaction for SDLT planning opportunities
• Advise on MDR, mixed-use classification, and reliefs
• Structure company acquisitions and portfolio purchases
• Handle communications with HMRC and SDLT submissions
• Represent you in any SDLT enquiry or dispute

For a free initial review of your SDLT liability, book a consultation or contact our team today.

Frequently Asked Questions

How much SDLT will I pay on a £1 million property in London? For a standard residential purchase of £1 million (not an additional dwelling), the SDLT is £43,750. If it's an additional dwelling, the 3% surcharge brings the total to £73,750.

Can I claim Multiple Dwellings Relief on a house with a granny annexe? Yes, if the annexe is self-contained — with its own kitchen, bathroom, and living facilities — you may be able to claim MDR. This can significantly reduce the SDLT liability. However, the rules changed following the 2024 Budget, so specialist advice is essential.

What is the SDLT rate for mixed-use property in London? Mixed-use property is charged at non-residential SDLT rates, which are significantly lower than residential rates. The 3% additional dwelling surcharge does not apply to mixed-use purchases. This can result in substantial savings on London property transactions.

Should I buy a London property through a company? For single residential purchases, buying through a company can trigger the 15% SDLT rate and Annual Tax on Enveloped Dwellings (ATED). However, for property portfolios and certain commercial structures, company ownership can be advantageous. Specialist advice is essential to determine the right structure for your circumstances.