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Last updated: 30 March 2026
The most important 60 minutes before you exchange

Buying a leasehold flat?
Read the lease before you sign.

Your solicitor checks the title. They may not flag the ground rent doubling clause. Or the unexpired term. Or the major works liability. LEASE-iQ will.

Check my lease before I exchange →

This guide is for information only. Not legal advice. Building Trust is a technology platform, not a law firm. Always take professional advice before acting on anything here.

⚠️
The ground rent trap

A doubling ground rent clause can turn £300/year into £4,800/year over 125 years. LEASE-iQ found one in a block in Battersea. The leaseholder had no idea it was there. Surface these before you exchange. Not after.

What to check before you exchange

Six things your solicitor may not flag. LEASE-iQ will.

High risk

Ground rent review mechanism

Check clauses 1 & schedule

Doubling clauses, RPI-linked increases, fixed rises. Some are now unenforceable under the Ground Rent Act 2022. But only for post-June 2022 leases. Older leases may still contain them.

High risk

Unexpired lease term

Check lease commencement date

Under 80 years: mortgage lenders may refuse and extension costs more under current law due to marriage value. Under 70 years: most lenders won't lend. Under 60 years: resale becomes very difficult. The LFRA 2024 abolishes marriage value but is not yet in force. Check before your survey.

Check carefully

Major works liability

Check last 3 years accounts

Is there a Section 20 consultation in progress? Any major works planned? A roof replacement could mean a £20,000+ bill arriving six months after you exchange.

Check carefully

Reserve / sinking fund

Request 3 years accounts

A block with no reserve fund has no buffer for unexpected repairs. All costs land immediately on leaseholders as a special levy.

Check carefully

Freeholder / managing agent

Check Companies House

Who owns the freehold? PE operator, council, or residents company? Freeholder type determines how well the building is run and how disputes are handled.

Ask LEASE-iQ

Subletting restrictions

Check lease covenants

Can you sublet if your circumstances change? What consent is required? What fees apply? Under the Renters Rights Act 2025 your tenant may have new rights that interact with your head lease.

Retirement village buyers

Buying a McCarthy & Stone, Audley or Retirement Villages Group flat?

Retirement village leases contain terms that standard conveyancing often misses: deferred management charges (1 to 2% per year of ownership), event fees on resale, restricted resale through the operator, and service charges rising faster than inflation. These are legal. But you need to understand them before you sign.

What to watch for
⚠ Deferred management charge. Typically 1 to 2% per year owned, paid on sale
⚠ Event fee or exit fee. Triggered on sale, subletting, or death
⚠ Restricted resale. Operator controls who you can sell to
⚠ Service charges. Check 5 years of accounts, not just current year
What LEASE-iQ does
✓ Identifies and explains all DMC and event fee clauses
✓ Extracts all DMC and event fee clause language so you can calculate costs with your financial advisor
✓ Flags resale restrictions and their implications
✓ Tells you if your lease terms are unusual compared to typical leases
Check my retirement lease →

Check it before you exchange. Not after.

LEASE-iQ costs less than an hour of your conveyancer's time. It takes 3 minutes. And it reads the clauses they might not flag.

Check my lease before exchange