Buying an apartment in the UK involves far more than just saving for a deposit. Research shows that buyers typically spend an additional 3% to 10% of the property price on fees and taxes alone. On a £300,000 flat, that means between £9,000 and £30,000 in extra costs you need to have ready before you get the keys. That’s a big number, and it catches a lot of people off guard.
I’ve been writing about UK property for years, and this is the question I hear more than almost any other: “What did I forget to budget for?” The answer is usually stamp duty, legal fees, surveys, and a dozen smaller charges that add up fast. The goal of this article is simple — I want to walk you through every major cost you’ll face when buying an apartment, so you can plan your finances with confidence and avoid any nasty surprises on completion day. Here’s what you actually need to know.
If you’re feeling overwhelmed by the sheer number of line items, you’re not alone. That’s why I always recommend breaking the process down into stages. A good first step is to get a clear picture of your legal obligations, and you can do that by speaking with a property lawyer online who can explain exactly what applies to your situation. It’s a quick way to turn uncertainty into a plan.
What “buying costs” actually means when you purchase an apartment
The most important thing to understand is that the price you agree with the seller is only the beginning. Every pound you spend beyond that — from the government tax to the solicitor’s invoice — is part of your total buying cost. And unlike the deposit, most of these can’t be borrowed. You need to have the cash ready.
I’ve seen buyers focus entirely on the deposit and forget that stamp duty alone can run into five figures. On a £400,000 standard purchase, you’d pay 0% on the first £125,000, 2% on the next £125,000, and 5% on the remaining £150,000 — totalling £10,000 in SDLT. If you’re a first-time buyer, the picture is much better: you pay 0% on properties up to £300,000, and only 5% on the portion between £300,001 and £500,000. On a £350,000 first home, that saves you £5,000. My advice? Always check your SDLT liability before you start viewing properties. It shapes what you can actually afford.
Why getting the full cost picture matters more than you think
Here’s the reality: if you’re stretching your savings to hit a 15% deposit, you might not have enough left for the fees. The example from one calculator shows a buyer putting down £52,500 on a £350,000 property, but needing another £7,668 in additional costs on completion day alone. That includes stamp duty of £2,500, solicitor fees of £1,500, a mortgage arrangement fee of £999, and removal costs of £1,100. If you don’t have that cash, the purchase falls through.
Consider a scenario where you’re buying a £300,000 apartment as a second home. You’d pay the standard SDLT plus a 3% surcharge on the entire purchase price. That means 3% on the first £125,000, 8% on the next £125,000, and 13% on the remaining £50,000. The total tax bill jumps significantly. The difference between being a first-time buyer and an additional homeowner is enormous, and it’s something I see people underestimate all the time.
What I’d do in your shoes: before you even book a viewing, run the numbers through an online calculator. Know your stamp duty, your survey costs, and your legal fees. That way, you’re never in a position where you find the perfect flat but can’t afford to complete the purchase. For a deeper look at the lifestyle trade-offs, you might find my piece on apartment living pros, cons, and hidden costs helpful.
Where buyers most often get the numbers wrong
I’ve watched enough purchases go sideways to know the patterns. Here are the mistakes that come up again and again, and how to avoid each one.
Underestimating stamp duty after the April 2025 threshold change
From 1 April 2025, the nil-rate threshold for SDLT in England returned to £125,000, down from the temporary £250,000 level. That means more of your purchase price is now taxable. On a £400,000 standard purchase, the total SDLT is £10,000 — not the lower figure you might have expected under the old rules. If you’re buying jointly with someone who already owns a property, the 3% surcharge applies across the entire price, pushing the rate on the first £125,000 to 3% and on the next band to 8%. Always check the current thresholds with a real estate lawyer before you commit.
Skipping the survey to save a few hundred pounds
A RICS Level 2 survey costs around £420, and a Level 3 building survey can be £800. I’ve seen buyers skip this to save money, only to discover structural issues, damp, or leasehold problems after completion that cost thousands to fix. On an apartment, you also need to check the service charge history and the building’s overall condition. A survey is not an optional extra — it’s the best insurance you can buy. If you want to understand what a survey covers, my guide on whether you should always get a survey goes into the detail.
Forgetting about buildings insurance from exchange of contracts
Once you exchange contracts, you are legally responsible for the property. If it’s damaged by fire, flood, or storm between exchange and completion, you bear the loss. That means you need buildings insurance in place from exchange day, not completion day. The cost is around £20 per month for a typical apartment, but the risk of not having it is catastrophic. Set a reminder to arrange this the moment you exchange.
Ignoring the true cost of mortgage fees
The average mortgage arrangement fee is £999, and the booking fee is £99. Many buyers choose to add these to the loan balance rather than paying upfront. But on a 25-year mortgage at 5%, adding a £1,000 fee costs you roughly £750 in extra interest over the full term. Paying the fee upfront saves you money in the long run if you have the cash. Compare the total cost, not just the monthly payment.
→ Scroll right to see all columns
| Cost Category | Typical Range | Notes |
|---|---|---|
| Stamp Duty (SDLT) | £0 – £100k+ | Depends on price, buyer status, and location |
| Solicitor fees (inc. VAT) | £1,500 – £3,000 | Includes disbursements like searches |
| Survey costs | £400 – £1,500 | Level 1 to Level 3 surveys |
| Mortgage fees | £0 – £2,000 | Arrangement, booking, valuation fees |
| Other costs | £500 – £3,000 | Removals, insurance, CHAPS transfer |
How to budget for every stage of buying your apartment
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Here’s the practical breakdown of what you’ll pay and when, so you can plan your cash flow from offer to moving day.
Weeks 1–2: Instructing professionals and initial costs
Right after your offer is accepted, you’ll instruct a solicitor and arrange a survey. The solicitor’s initial work costs around £649, and the survey is typically £550 for a standard RICS Level 2. You’ll also pay the mortgage booking fee of £99 at this stage. Total for the first two weeks: roughly £1,298. Don’t delay — the solicitor needs time to conduct searches and raise enquiries. A financial advisor can help you structure your cash flow so these early payments don’t catch you off guard.
Weeks 2–6: Searches and enquiries
Your solicitor will order a series of searches to check for issues with the property and the local area. These include a Local Authority Search (£150), an Environmental Search (£55), a Water & Drainage Search (£65), a Chancel Repair Liability search (£25), a Bankruptcy Search (£4), and a Land Registry Search (£4). Total: £303. These are non-negotiable — your lender will require most of them, and they protect you from buying a property with hidden legal problems.
Weeks 8–12: Exchange of contracts
This is the big one. At exchange, you pay the deposit — typically 10% of the purchase price, so £52,500 on a £525,000 apartment. You also need buildings insurance in place from this day, which costs around £420 for the first year. Total at exchange: £52,920. This is the point of no return, so make sure all your searches and surveys are satisfactory before you sign.
Completion day: 1–4 weeks after exchange
On completion, you pay the remaining balance plus all outstanding fees. This includes stamp duty (£2,500 in the example), the solicitor’s final bill including VAT (£1,500), the Land Registry fee (£150), the CHAPS bank transfer fee (£35), ID verification (£12), the mortgage arrangement fee (£999), and removal costs (£1,100). Total on completion day: £6,296. After that, your monthly costs begin — mortgage payment of £1,677, plus estimated running costs of £581 for utilities, insurance, and the maintenance fund. If you’re buying a new-build, you might also want to read my thoughts on whether a new-build apartment is worth it.
- 1Calculate your total cash requirementAdd your deposit to all estimated fees — stamp duty, solicitor, survey, mortgage fees, removals, and insurance. Use an online calculator to get a precise figure.
- 2Arrange buildings insurance before exchangeOnce you exchange contracts, you’re responsible for the property. Get a policy in place from that day to cover fire, flood, and storm damage.
- 3Budget for monthly running costsAfter moving in, expect to spend around £581 per month on utilities, maintenance, insurance, and service charges. Factor this into your affordability check.
Frequently asked questions about apartment buying costs
Can I add stamp duty to my mortgage? ▾
What happens if I exchange contracts but can’t complete? ▾
Do I pay stamp duty on a leasehold apartment differently? ▾
Is the 3% surcharge refundable if I sell my previous home? ▾
What is the cheapest way to get a survey on an apartment? ▾
Buying an apartment in the UK is a process with many moving parts, but the financial side doesn’t have to be a mystery. The single most important thing you can do is calculate your total cash requirement — deposit plus all fees — before you start viewing properties. That one number tells you what you can genuinely afford. If this was useful, you might also want to read essential tips for buying an apartment with good insulation in the UK.
Sources and Further Reading
Top tips for buying apartment insurance in the UK — A practical guide to getting the right cover for your flat, including buildings and contents policies.
True Cost of Buying Calculator. PropBar, 2025.
UK Property Buying Costs Calculator. UK Calculator, 2025.
