Informal vs Formal Lease Extension — Pros, Cons, and When to Use Each

Two Routes to Extending Your Lease

If you are a qualifying leaseholder, you have two options for extending your lease: the informal (voluntary) route, where you approach the freeholder directly and negotiate terms, or the formal (statutory) route, where you serve a Section 42 notice under the Leasehold Reform, Housing and Urban Development Act 1993 and trigger a legally-binding process.

Each has distinct advantages and disadvantages. The right choice depends on your freeholder's relationship with leaseholders, the urgency of your situation, and whether you need the protection of the statutory framework.

The Informal Route

In an informal extension, you or your solicitor approach the freeholder and propose terms. There is no prescribed process, no mandatory deadlines, and no right to a particular outcome. The freeholder can accept, reject, or simply ignore you.

**Advantages:**

• Can be faster — if the freeholder is cooperative, the process may complete in 3–6 months
• Lower professional fees — no formal notices, no counter-notice mechanics, potentially lower surveyor costs if a single joint expert is used
• More flexible terms — you can negotiate aspects of the new lease beyond what the 1993 Act prescribes (though be cautious about what you agree to)

**Disadvantages:**

• No legal compulsion — the freeholder can walk away at any time, leaving you with costs but no extension
• No statutory protection on terms — the freeholder may seek to include onerous service charge clauses, updated insurance arrangements, or other terms that disadvantage you
• No right to apply to the First-tier Tribunal to resolve a premium dispute under the informal route
• The 990-year extension term is a statutory entitlement — an informal negotiation might result in a shorter extension unless you specifically insist

The Formal (Statutory) Route

The formal route involves serving a Section 42 notice under the 1993 Act. The freeholder is legally required to respond within two months and to engage with the process.

**Advantages:**

• The freeholder cannot simply refuse — they must engage or face court proceedings
• Statutory terms apply as a minimum — 990 years added to the existing term, ground rent to peppercorn
• You can apply to the First-tier Tribunal to determine the premium if negotiations fail
• The process is predictable and has clear deadlines
• Protects against a freeholder attempting to sell the freehold mid-negotiation (the benefit of the notice transfers to any new freeholder)

**Disadvantages:**

• More expensive professional fees — surveyors, solicitors, and potentially tribunal costs
• Slower — the full process from notice to completion is typically 6–18 months
• You pay the freeholder's reasonable professional fees as well as your own

Which Route Is Right for You?

Consider the informal route if:

• Your freeholder is a known, responsive professional management company
• Your lease has more than 90 years remaining (lower stakes, simpler premium calculation)
• Speed is your priority and you are confident the freeholder will negotiate in good faith

Consider the formal route if:

• Your lease has fewer than 85 years remaining (the stakes are higher)
• You have had difficulty getting responses from the freeholder
• The freehold is owned by an offshore entity or absentee freeholder
• You need certainty of outcome

A Hybrid Approach

Many leaseholders begin informally but instruct a solicitor to serve a Section 42 notice in parallel if early negotiations stall. Serving formal notice does not prevent the parties from continuing to negotiate informally — and if agreement is reached, the notice can be withdrawn by agreement.

Use our [Lease Extension Calculator](/lease-extension-calculator) to understand the likely premium range before choosing your route. This helps you decide whether the freeholder's informal offer is reasonable or whether formal protection is warranted.