Is buying a flat a good investment? The buy-to-let case pros and cons

Buying a flat can be a good investment where the net yield after service charges and ground rent justifies the leasehold and building-safety risks that come with it. Flats are among the most widely bought buy-to-let properties in the UK, especially in cities, because they are cheaper than houses, well located for tenant demand, and largely free of external maintenance. The catch is that a flat is rarely a simple asset: it is usually leasehold, it carries costs you do not fully control, and its capital growth has historically trailed houses. Whether it is worth it in 2026 comes down to the specific lease, the building, and the numbers once every cost is in.

The case for buying a flat as an investment

Flats typically offer higher gross rental yields than comparable houses in the same area, because the purchase price is lower relative to the achievable rent. A two-bedroom city flat can cost 20 to 30 per cent less than a two-bedroom terraced house while letting for a similar monthly rent, which suits an investor focused on income return rather than capital growth.

Demand for flats is consistently strong in most UK cities, particularly from young professionals, couples and students who value location and low maintenance over space. The tenant pool is larger than for family houses in the same area, so void periods tend to be shorter. External maintenance is also lighter on the landlord: the structure, roof and common parts are maintained collectively through the service charge, which reduces your exposure to large, unexpected structural bills, even though the service charge itself is a real and sometimes unpredictable cost.

The case against buying a flat as an investment

The biggest structural issue is leasehold ownership. Most flats are sold on long leases of 99, 125 or 999 years rather than freehold, and as a lease shortens the flat becomes harder to mortgage and sell and more expensive to extend. Under the valuation rules as they currently apply, once a lease falls below 80 years “marriage value” is added to the cost of extending it, which can be substantial. The Leasehold and Freehold Reform Act 2024 is changing how extensions are valued and priced as its provisions are brought into force, so check the current position before relying on either basis; our guide to the leasehold and freehold reform changes sets out where this stands. As a rule, treat any lease below about 90 years as a cost to price into the purchase, not an afterthought.

Service charges and ground rent are ongoing costs outside your control. Service charges fund the building’s maintenance and insurance and can be heavy in blocks with lifts, communal heating or large grounds, and a one-off major-works bill for roofing, redecoration or cladding can run to thousands of pounds at short notice. The Leasehold Reform (Ground Rent) Act 2022 restricted most new leases to a peppercorn ground rent, but many existing leases still carry escalating ground rent clauses that can hurt mortgageability. Across the flats we see managed on August, the service charge is the line that most often turns an attractive gross yield into a thin net one.

Building safety is the risk specific to flats. Since the Grenfell Tower fire in 2017, buildings above 11 metres fall within a building-safety regime, and some require an EWS1 external wall assessment before a lender will lend, which has left flats in affected blocks hard to mortgage or sell. This is a liquidity risk that simply does not apply to houses.

Do flats go up in value as much as houses?

Historically, no. In most UK regions houses have appreciated more than flats over long horizons, partly because the leasehold structure caps a flat’s intrinsic value and partly because owner-occupier demand for family houses is stronger. If your investment case rests mainly on capital growth rather than income, that gap matters, and it is worth weighing where you buy as much as what you buy. When you do come to sell, the gain is subject to Capital Gains Tax, with the annual exempt amount now £3,000, so the after-tax growth is what counts.

Key questions to ask before buying a flat to let

• How many years remain on the lease? Anything below 90 should prompt a careful look at the extension cost and whether it is reflected in the asking price.

• What are the service charges? Ask for the last three years of accounts and any Section 20 major-works notices to see the cost history and anything large coming.

• What is the ground rent, and does it escalate? An escalating clause can reduce mortgageability even where the rent is currently modest.

• Is the building EWS1 assessed if it is over 11 metres? An unresolved building can limit your ability to remortgage or sell.

• Is there a share of freehold or a commonhold structure? Either gives residents more control of the building and removes the ground-rent risk.

• What is the net yield after service charge, ground rent and insurance? The gross figure on a flat flatters the return; model it net with the August rental yield calculator before you offer.

So, are flats a good investment?

For an income-focused investor buying a well-located flat, on a long lease, with a sensible service charge and no building-safety overhang, the answer is often yes: the higher yield and shorter voids do real work. For a buyer relying on capital growth, or looking at a short lease, a heavy or volatile service charge, or a block with unresolved cladding, the case is much weaker and the liquidity risk is real. The flat investments that work tend to be the ones where the buyer pulled the lease and the last three years of service-charge accounts before offering rather than after. For a direct side-by-side, our guide to buy-to-let houses versus flats compares the two across yield, financing and long-term return, and our property investment strategies guide sets the choice in the wider context.

Once you own a flat, the service charge, ground rent and insurance are the costs that decide whether the net yield holds up, so they are worth tracking from day one. August keeps those costs and documents against each property in one place, which makes the running yield easy to see rather than something you reconstruct at tax time. You can see how that works in expense tracking.

Frequently asked questions

Are flats a good investment in the UK?

Flats can be a strong income investment where the lease is long, the service charge is reasonable and tenant demand is high, because they usually yield more than houses and let faster. They are a weaker choice where capital growth is the main goal or where lease length, service charges or building safety are unresolved.

Do flats increase in value?

They do over the long term in most areas, but historically less than houses, partly because of the leasehold structure and partly because of stronger owner-occupier demand for family homes. The net gain after Capital Gains Tax is what matters when you sell.

Is a leasehold flat a good investment?

It can be, provided the lease is long enough to mortgage and sell easily and the ground rent is modest or peppercorn. A short lease, an escalating ground rent or an unresolved cladding issue can all undermine the investment, so the lease terms deserve as much scrutiny as the rent.

Is it better to invest in a flat or a house?

Flats tend to win on yield and management simplicity, houses on capital growth and resale liquidity. Which suits you depends on whether you are buying for income or growth. You can start for free and model the net yield on any flat before you commit.