The deposit, stamp duty and mortgage are the headline numbers. It's the smaller items — leasehold pack fees, indemnity policies, gifted-deposit checks, post-completion costs — that catch buyers out. Individually small; together, they regularly add £2,000–£5,000 to a UK purchase. Below: the 15 we see most often in reader questions, with real ranges and what to do about them.

1. Leasehold management pack fees — £200–£400

If you're buying a leasehold property (most flats, some new builds), the freeholder or management company supplies a "leasehold information pack" — service-charge accounts, ground rent statements, recent meeting minutes, buildings insurance documents. Most charge a fee for compiling it, paid by the buyer. Adds 1–3 weeks if the pack is slow to issue.

2. Chain-related sale-side conveyancing — usually 70–85% of purchase fee

If you're moving home rather than buying for the first time, you'll need a conveyancer on both your sale and your purchase. Sale-side fees are typically 70–85% of the purchase-side figure — on a £450,000 purchase with £1,500 of purchase legal fees, the sale-side is likely another £1,050–£1,275. Quote on the conveyancing fees calculator.

3. Indemnity insurance — £20–£200 per policy

Indemnity policies cover specific title risks the searches uncovered — missing planning consent for an extension, lack of building regs sign-off, restrictive covenants. Single-premium one-off policies. Cheap individually but several can stack on a single transaction.

4. Gifted-deposit checks and delay — no direct cost, 1–3 weeks of timeline

Under the Money Laundering Regulations 2017, solicitors run source-of-funds checks on any deposit money that arrived recently. For gifted deposits, the giver must provide bank statements and a signed gift letter. No direct cost, but the timeline impact can mean delaying exchange and re-booking removals.

5. SDLT additional-property surcharge — 5% across all bands

If you'll own any other residential property at completion — including a brief overlap if your sale completes after your purchase — the 5% additional-property SDLT surcharge applies. On a £400,000 home that's £20,000 of extra tax. Reclaimable within 3 years if you sell the previous main home, but the cash hits first.

Most conveyancers structure transactions to avoid this, but it's worth flagging early. Check the surcharge math on the second home SDLT calculator and the reclaim mechanics on the refund calculator.

6. New build indemnity insurance — £100–£150

New builds typically need a specific indemnity policy covering certain title risks until the legal title is fully registered with HM Land Registry. Quoted by the conveyancer as a disbursement.

7. Bankruptcy and priority searches — £4–£8 each

Required by every mortgage lender. Trivial cost individually but sometimes missed from quotes. Worth checking they're included.

8. Chain insurance — £50–£300

A one-off policy that pays out if the chain collapses after exchange. Optional, only worth it on complex chains. The cost depends on the chain length and the value of fees at risk.

9. Mortgage product fee added to the loan — extra interest cost

Most lenders let you add a £999–£1,995 product fee to the loan. Reduces upfront cash, but you pay interest on it for the term. On a £1,500 fee at 4.5% over 25 years, that's £830 of extra interest — worth taking the upfront hit if you have the cash. Check both options on the mortgage repayment calculator.

10. Survey-triggered renegotiation — variable, £500–£5,000

If your survey finds material issues (damp, roof problems, electrical faults), you'll either need to negotiate the price down or budget for remediation. Common defects on older properties:

• Rewiring — £3,000–£8,000 for a 3-bed house
• Damp-proof course — £2,000–£5,000
• New boiler — £2,000–£4,000
• Roof repair — £500–£15,000+ depending on scope
• Subsidence remediation — £5,000–£30,000+

11. Bank transfer (CHAPS) fees — £35 each

Same-day funds transfer for completion. Standard fee around £35 per transfer. Usually one for the deposit, one for the balance.

12. Identity verification and AML compliance — £25–£60

Solicitors run electronic ID checks under anti-money-laundering rules. Usually charged as a small disbursement per applicant.

13. Locks and immediate post-move costs — £500–£2,000

Things that don't feel optional after you move in:

• New locks (always recommended): £100–£250
• Basic essentials (mattress, white goods if not included): variable
• Council tax registration: no fee but immediate liability
• Utility set-up: meter readings, broadband install (£35–£90 install fee on many providers)
• TV licence: £174.50/year

14. Council tax and utilities the first month

Pro-rated council tax from completion date. Some councils charge full months from day of liability. Utility companies often estimate the first bill high and reconcile later. Budget for one or two slightly higher-than- expected bills in the first three months.

15. Seller withdrawal — £700–£1,500 lost

In England and Wales, neither party is legally bound until exchange. If the seller pulls out before exchange, you typically lose any fees paid by that point — survey, searches, mortgage valuation, conveyancing retainer. Usually £700–£1,500 of sunk cost. Scotland uses a different system (offers are binding once accepted in writing), which is one reason Scottish buyers face fewer "fall-through" losses.

Building a sensible contingency

The simplest rule: 1–2% of the property price as contingency. On the typical UK price points:

• £250,000 home — £2,500–£5,000
• £350,000 home — £3,500–£7,000
• £450,000 home — £4,500–£9,000
• £600,000 home — £6,000–£12,000

Keep it in an easy-access savings account, separate from your deposit, until 30 days after completion. Most surprises land within the first month.

Use the calculators to spot what you're missing

The home buying cost calculator includes every line item in this guide as separate breakdown rows so nothing gets hidden in the total. The moving costs calculator is a lighter, faster version focused on the cash-flow at completion.

Frequently asked questions

What hidden costs are there when buying a house?

The most common surprises are leasehold management pack fees (£200–£400), chain-related sale-side conveyancing if you're moving home, indemnity insurance (£20–£200), the SDLT additional-property surcharge if there's any overlap between sale and purchase, gifted-deposit AML checks delaying completion, and immediate post-completion costs like locks, basic furnishings and utility setup (£500–£2,000).

How much contingency should I budget?

1–2% of the property price covers most realistic surprises. On a £300,000 home that's £3,000–£6,000. Tighter than that and you're exposed if the survey triggers a renegotiation, the chain wobbles, or the leasehold pack throws up an unexpected charge.

Do new builds have hidden costs?

Yes — new build indemnity insurance is typical (£100–£150), the developer may charge management fees on shared estates (£200–£500/year), and the snagging period can cost £300–£600 for an independent inspection. Don't assume "new" means "no extras".

What's the SDLT additional-property trap?

If you'll own more than one residential property at completion — even by one day's overlap during a sale and purchase — the 5% additional-property SDLT surcharge applies. On a £400,000 home that's an extra £20,000. You can reclaim it if you sell the previous main home within 3 years, but the cash impact lands first.

Are conveyancing disbursements separate from the legal fee?

Yes. The headline legal fee covers your conveyancer's time. Disbursements (£500–£800 typically) cover third-party costs: local-authority searches, Land Registry fees, ID checks, bankruptcy searches, official copies. Always check whether a quote is fee-only or fee-plus-disbursements.

Can the seller pull out and leave me out of pocket?

Yes — in England and Wales, neither party is legally bound until exchange. If the seller withdraws before exchange, you typically lose any survey, search, valuation and legal fees paid by that point — often £700–£1,500. Some new-build developers offer "reservation fee" protections; private sales rarely do.

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Last reviewed: 24 May 2026.