How Much Should I Budget for a Flat Purchase in London? A Realistic First-Time Buyer Cost Guide

The gap between "I have a deposit saved" and "I have enough to complete" can be anywhere from £5,000 to £15,000 or more depending on the purchase price and the specific property. This guide sets out every line item you should plan for, with worked examples at three common London price points: £350,000, £400,000, and £500,000.

What this guide covers:

• Every cost category from deposit to moving day

• Leasehold-specific charges that often catch London flat buyers off guard

• Realistic all-in budget totals at three price points

• A simple framework for working out the right price range to search in

What costs make up your flat-buying budget in London?

There are two ways to think about buying costs. The first is by category: what are you actually paying for? The second is by timing: when does each payment fall due?

The full budget stack for a London flat purchase:

• Deposit - the largest single sum, paid at exchange of contracts

• Stamp Duty Land Tax (SDLT) - payable on completion, calculated on the purchase price

• Conveyancing fees - your solicitor's legal fees plus disbursements (searches, Land Registry, bank transfer charges)

• Survey - a structural or condition assessment of the property

• Mortgage fees - which may include a product arrangement fee, a valuation fee, and a broker fee

• Leasehold extras - management information packs, notice of assignment, deed of covenant, and related charges

• Moving costs - removal company or van hire

• Contingency - a buffer for unexpected costs that arise between offer and completion

When each cost typically falls due

Cost	When payable
Mortgage broker fee	On application or completion (varies)
Survey	On instruction, before exchange
Conveyancing fees (initial)	On instruction
Leasehold management pack	During legal process, before exchange
Stamp duty	On completion
Deposit	At exchange of contracts
Remaining conveyancing costs	On or before completion
Removal costs	On moving day

The practical implication is that some costs arrive weeks before completion. Buyers who treat their entire savings as "the deposit" can find themselves short when solicitor invoices and survey fees land first.

Deposit: the biggest number, but not the only one

The deposit is the most visible part of the budget, but it should be treated as a separate pot from your buying costs. A common mistake is to save a target deposit figure and then assume everything else will be covered by whatever is left over. It rarely works that way.

Most mortgage lenders require a minimum deposit of 5% to 10% of the purchase price. A larger deposit typically unlocks better mortgage rates, which reduces your monthly repayments over the life of the loan. However, stretching every pound into the deposit at the cost of leaving yourself with no buffer for fees is a false economy.

Deposit amounts at three London price points

Purchase price	5% deposit	10% deposit	15% deposit
£350,000	£17,500	£35,000	£52,500
£400,000	£20,000	£40,000	£60,000
£500,000	£25,000	£50,000	£75,000

The key planning principle: once you know your deposit size, treat your buying costs (everything else in this guide) as a completely separate cash requirement on top of that figure. Do not mix the two pots when working out what you can afford to search for.

A note on gifted deposits: If part of your deposit is a gift from family, your solicitor will need a gifted deposit letter, and your lender may require additional evidence. This does not add a cost, but it does add a step that is worth knowing about early.

Stamp duty in 2026: what first-time buyers actually pay

Stamp Duty Land Tax (SDLT) is one of the most misunderstood costs in a property purchase. The good news for first-time buyers in England is that relief applies up to a certain threshold. The important detail is understanding exactly where that relief cuts out.

Under current HMRC SDLT rules, first-time buyers pay:

• 0% on the first £300,000 of the purchase price

• 5% on the portion between £300,001 and £500,000

• No first-time buyer relief if the purchase price exceeds £500,000 (standard residential rates apply instead)

This last point matters significantly in London. A buyer purchasing at £499,000 pays £9,950 in SDLT. A buyer purchasing at £501,000 loses first-time buyer relief entirely and pays standard rates, which produces a materially higher bill. In a market where properties frequently cluster around the £500,000 mark, this threshold is worth understanding before making an offer.

SDLT worked examples for first-time buyers

Purchase price	SDLT payable	Calculation
£350,000	£2,500	0% on £300k + 5% on £50k
£400,000	£5,000	0% on £300k + 5% on £100k
£500,000	£10,000	0% on £300k + 5% on £200k
£501,000	£15,050*	Standard rates apply - relief lost

*Illustrative figure based on standard residential rates. Buyers approaching the £500,000 boundary should confirm their exact liability with their solicitor.

One further point: SDLT is payable on completion, not at exchange. It does not need to sit in your account from day one, but it must be available and ready. Your solicitor will typically collect it just before completion and submit it to HMRC on your behalf.

Legal, survey, and mortgage fees: the costs buyers forget to add up

These three cost categories are where most first-time buyers underestimate their budget. Each one has a wide range depending on the property, the lender, and the professionals you choose.

Conveyancing fees

For a leasehold flat in London, conveyancing is more involved than a straightforward freehold purchase. Your solicitor will review the lease, check the management company's accounts, raise enquiries about service charges and ground rent, and deal with any leasehold-specific legal requirements. Expect to pay more than the low-end national quotes often cited online.

Realistic conveyancing budget for a London leasehold flat: £1,800 to £2,800 in total, including disbursements such as local authority searches, Land Registry fees, and bank transfer charges. Some solicitors quote fees and disbursements separately, so always ask for a full quote rather than just the headline legal fee.

Survey costs

A RICS Home Survey Level 2 is the standard choice for a typical modern or well-maintained flat. It covers the condition of the property, highlights any defects, and flags items needing attention. For the price range covered in this guide, expect to pay £500 to £900. A Level 3 survey (a full structural survey) costs more and is generally reserved for older, unusual, or significantly extended properties.

Mortgage-related fees

Fee	Typical range	Notes
Mortgage arrangement fee	£0 to £2,000	Can often be added to the loan, but this increases interest paid
Lender valuation fee	£0 to £400	Many lenders offer free valuations; check your product
Mortgage broker fee	£0 to £700	Many brokers charge nothing; paid advisers average around £500-£650

Important: Adding an arrangement fee to your mortgage loan rather than paying it upfront reduces the immediate cash requirement, but it means paying interest on that fee for the life of the mortgage. For a £1,500 fee added to a 25-year mortgage, the total interest cost can be several hundred pounds extra over time. Worth knowing before deciding.

Leasehold extras: the London flat costs that catch buyers out

The majority of London flats are sold on a leasehold basis, which means you are buying the right to occupy the property for the remaining term of the lease rather than owning the land itself. This creates a layer of costs and considerations that simply do not apply to freehold house purchases, and they are the most commonly overlooked items in a first-time buyer's budget.

Worth knowing: These charges are not set by your solicitor or your lender. They are set by the freeholder or managing agent, and they vary considerably from building to building.

One-off leasehold charges on purchase

Several fees may be payable as part of the legal process, depending on the terms of the lease:

• Management information pack / LPE1 form - the seller typically pays for this, but buyers should confirm. It can cost £200 to £400 and covers service charge accounts, ground rent history, and building insurance details.

• Notice of assignment - a fee charged by the freeholder or managing agent to formally record the change of ownership. Typically £50 to £250.

• Notice of charge - a similar fee if you are buying with a mortgage, to register the lender's interest. Typically £50 to £200.

• Deed of covenant - required in some leases, where the buyer formally agrees to the lease obligations. Can be £100 to £300.

• Certificate of compliance - some leases require the freeholder to confirm the transfer is compliant. Typically £50 to £200.

In total, leasehold-specific purchase fees can add £300 to £1,000 to your legal costs, depending on the building and the lease.

Questions to ask before you exchange

Beyond the one-off fees, buyers should understand the ongoing and potential future costs of the specific building:

• What is the current annual service charge, and has it increased significantly in recent years?

• Is there an active reserve fund, and what is its balance?

• Are there any planned or ongoing major works under Section 20 of the Landlord and Tenant Act 1985?

• What is the ground rent, and does it escalate over time?

• How many years remain on the lease, and is a lease extension likely to be needed within the next five to ten years?

These are not buying costs in the immediate sense, but the answers can materially affect both the value of the property and your ability to sell or remortgage it in future.

Worked examples: realistic all-in budgets at £350k, £400k, and £500k

The tables below pull every cost category together. The deposit column is shown separately so you can see the full cash requirement in one place. All figures use mid-range assumptions; the low and high columns reflect realistic variation rather than best-case and worst-case extremes.

These examples assume a first-time buyer purchasing a leasehold flat with a mortgage, using a paid broker, paying a mortgage arrangement fee upfront, and commissioning a Level 2 survey.

£350,000 purchase

Cost	Low	Mid	High
Deposit (10%)	£35,000	£35,000	£35,000
Stamp duty	£2,500	£2,500	£2,500
Conveyancing (incl. disbursements)	£1,800	£2,200	£2,800
Survey (Level 2)	£500	£650	£900
Mortgage arrangement fee	£0	£999	£2,000
Mortgage broker fee	£0	£500	£700
Leasehold extras	£300	£600	£1,000
Removal costs	£500	£900	£1,500
Contingency	£1,000	£1,500	£2,000
Total (buying costs only)	£6,600	£9,849	£13,400
Total cash required	£41,600	£44,849	£48,400

£400,000 purchase

Cost	Low	Mid	High
Deposit (10%)	£40,000	£40,000	£40,000
Stamp duty	£5,000	£5,000	£5,000
Conveyancing (incl. disbursements)	£1,800	£2,200	£2,800
Survey (Level 2)	£500	£700	£900
Mortgage arrangement fee	£0	£999	£2,000
Mortgage broker fee	£0	£500	£700
Leasehold extras	£300	£600	£1,000
Removal costs	£500	£900	£1,500
Contingency	£1,000	£1,500	£2,000
Total (buying costs only)	£9,100	£12,399	£15,900
Total cash required	£49,100	£52,399	£55,900

£500,000 purchase

Cost	Low	Mid	High
Deposit (10%)	£50,000	£50,000	£50,000
Stamp duty	£10,000	£10,000	£10,000
Conveyancing (incl. disbursements)	£2,000	£2,500	£3,200
Survey (Level 2)	£600	£800	£1,000
Mortgage arrangement fee	£0	£999	£2,000
Mortgage broker fee	£0	£500	£700
Leasehold extras	£300	£600	£1,000
Removal costs	£500	£900	£1,500
Contingency	£1,000	£1,500	£2,000
Total (buying costs only)	£14,400	£17,799	£21,400
Total cash required	£64,400	£67,799	£71,400

The headline takeaway: on top of a 10% deposit, first-time buyers in London should budget roughly £8,000 to £15,000 in additional buying costs depending on the purchase price and the specific circumstances. That figure rises if you face a higher arrangement fee, a complex leasehold situation, or unexpected survey findings.

How to decide what price range you can really afford

The worked examples above show that the total cash required to buy a £350,000 flat is realistically around £44,000 to £48,000 at a 10% deposit. That is a significantly different number from the deposit alone. The right way to use this information is to start from your total available cash and work backwards.

1. Total your available cash - savings, any gifted deposit, and any Help to Buy ISA or Lifetime ISA bonus you can access.

2. Ring-fence your buying costs - based on the tables above, set aside £8,000 to £15,000 depending on the price range you are targeting. This is your non-negotiable cost reserve.

3. What remains is your maximum deposit - divide that figure by your target deposit percentage to find your maximum purchase price.

4. Cross-check against mortgage affordability - most lenders will offer between four and four-and-a-half times your gross annual income. The lower of your deposit-based ceiling and your income-based ceiling is your real budget.

5. Apply a margin - do not search right up to the top of your budget. In a competitive market like North London, buyers who leave no headroom often find themselves unable to stretch when they find the right property.

The practical result: buyers who do this calculation before viewing properties waste far less time. They know their real ceiling, they can move quickly when the right flat appears, and they are not caught short by costs they did not plan for.

Budget for the whole purchase, not just the asking price

The right question when buying a London flat is not simply "can I afford the asking price?" It is "do I have enough cash to get from offer accepted to keys in hand?" For most first-time buyers, those are two very different numbers.

The key points to take away:

• Buying costs on a London leasehold flat typically run to £8,000-£15,000 on top of a 10% deposit

• Stamp duty for first-time buyers is zero up to £300,000 and 5% above that, up to the £500,000 relief ceiling

• Leasehold charges, survey fees, and conveyancing costs are higher for London flats than many generic guides suggest

• Always keep a contingency buffer - unexpected costs between offer and completion are common, not rare

Getting this calculation right before you start viewing properties is the difference between a smooth purchase and a stressful one. If you are planning to buy a flat in North London and want to work through a realistic budget based on your specific situation, the team at Hemmingfords can help you think it through before you make an offer.

Book a call with Hemmingfords to plan your buying budget with local North London expertise.