Leasehold Cost Calculator 2026
Buying a leasehold flat involves costs that go far beyond the mortgage. This calculator helps you understand the true annual cost of ownership — including service charges, ground rent, the sinking fund, major works provisions, and any lease extension premium — so you can budget accurately and avoid surprises.
Leasehold Annual Cost Calculator
Annual leasehold charges
New leases (post-June 2022) have zero ground rent.
Often included in the service charge — avoid double counting.
Often included in the service charge.
Future one-off costs (amortised over 10 years)
Your estimate for Section 20 / major works contributions.
If you know you will need to extend the lease.
Monthly costs
Total annual leasehold-specific costs
£3,300
£275/month equivalent
Full annual cost of ownership
£17,700
inc. mortgage & all costs
Monthly equivalent
£1,475/mo
Leasehold costs per £1,000 of purchase price
£11
Itemised breakdown
| Item | Annual |
|---|---|
| Service charge | £2,400 |
| Buildings insurance(Check if already included in service charge) | £400 |
| Reserve / sinking fund | £500 |
| Mortgage | £14,400 |
| Total | £17,700 |
Why leasehold costs are often underestimated
Many first-time buyers focus on the mortgage payment when budgeting for a leasehold flat, but the ongoing leasehold charges can add thousands of pounds to the annual cost of ownership. A flat in London with a £2,500 service charge, £500 reserve fund contribution, and a looming lease extension might cost £5,000–£10,000 per year more than the mortgage alone suggests.
Before exchanging contracts on a leasehold property, always request the last three years of service charge accounts, the current reserve fund balance, and any planned major works. Your conveyancer should obtain these as part of the standard enquiries process.
What to check before buying a leasehold flat
- How many years are left on the lease? (Below 80 years is critical; below 70 years restricts mortgage lending)
- What is the current annual service charge, and has it increased significantly in recent years?
- Is ground rent zero (new lease) or a fixed amount (older lease)? Check for escalation clauses.
- What is the current reserve fund balance, and is there a planned maintenance schedule?
- Are there any Section 20 major works currently consulted on or planned?
- Who is the managing agent, and do they have a good reputation?
Frequently asked questions
- What is a service charge on a leasehold property?
- A service charge is an annual contribution paid by leaseholders towards the maintenance, management, and insurance of the building and communal areas. It covers items such as cleaning, gardening, lift maintenance, building insurance, and the management company's fees. Service charges can vary significantly — from a few hundred pounds per year in a well-managed block to several thousand pounds in a luxury development.
- What is a sinking fund or reserve fund?
- A sinking fund (also called a reserve fund) is a savings pot collected from leaseholders over time to pay for major future works such as roof replacement, lift refurbishment, or external decoration. A well-funded reserve means leaseholders avoid sudden large bills when major works arise. When buying a leasehold property, always ask for the current reserve fund balance and the managing agent's long-term maintenance plan.
- Can my landlord increase the service charge?
- Yes, service charges can increase year on year. However, leaseholders have significant legal protections. Service charges must be reasonable, and leaseholders can challenge unreasonable charges at the First-tier Tribunal (Property Chamber). You are also entitled to request a summary of costs and inspect invoices. A managing agent or landlord cannot recover costs that are unreasonable or not properly consulted on.
- What is ground rent and has it been abolished?
- Ground rent is an annual payment from the leaseholder to the freeholder. Under the Leasehold Reform (Ground Rent) Act 2022, ground rent on new residential leases granted on or after 30 June 2022 must be zero (a peppercorn). Existing leases with ground rent are not affected and continue to charge ground rent under their original terms. If you are buying a new-build flat, ground rent should be zero. For resale properties, check the lease carefully.
- What are Section 20 major works?
- Section 20 of the Landlord and Tenant Act 1985 requires landlords to consult leaseholders before carrying out qualifying works where the cost to any individual leaseholder exceeds £250. The consultation process involves two written notices: a notice of intention and a notice of estimates. Leaseholders can make observations and nominate contractors. Failure to consult properly limits what the landlord can recover.
Related tools
- Lease extension cost calculator — Estimate the statutory premium to extend a leasehold flat
- Shared ownership staircasing calculator — Calculate the cost of buying more shares in your home
- Stamp duty calculator — Calculate SDLT on any UK property purchase