Every tenant-driven alteration to a commercial demise requires the landlord's consent, documented as a licence to alter. This guide explains what's actually in the licence, what the landlord's surveyor reviews, typical approval timelines, and how to shave weeks off the process.
A licence to alter (LTA) is the landlord's formal consent for tenant-initiated alterations to the demised premises. It's required under virtually every London commercial lease — the alterations covenant is one of the three principal covenants (alongside rent and repair).
The LTA documents: (1) what's being altered, (2) what standard of work, (3) whether reinstatement is required at lease end, (4) the tenant's indemnities to the landlord. It's signed by both parties and sits alongside the lease.
Plan for 4–10 weeks from application to signature:
Drawings, M&E schedules, method statements, contractor's compliance pack, insurance certificates.
Typically Cushman & Wakefield, CBRE, JLL, Colliers, or Knight Frank on behalf of the landlord.
Typical iterations: fire-stopping drawings, M&E commissioning evidence, structural sign-off letters.
Reinstatement scope agreed, undertakings in respect of landlord's costs, LTA special clauses.
Landlord solicitors draft LTA; tenant solicitors review. Both parties sign.
Often with landlord's 'consent in principle' letter allowing early mobilisation during final LTA execution.
Tenant typically pays:
Total LTA cost for a standard CAT B fit-out: £7,000–£20,000. Budget for it from day one of the project.
Submit LTA application at RIBA Stage 3 (design development), not at Stage 5 (pre-construction). This puts the 4–10 weeks in the design phase, not on the critical path of construction.
Estate-managed buildings (Broadgate, CWG, King's Cross) maintain approved contractor lists. Using one of them removes a major review item.
Most LTA delays are M&E queries. Commission M&E design at Stage 3 rather than value-engineering later.
Most London institutional landlords have template LTAs. Requesting the standard form (rather than bespoke drafting) saves 2–3 weeks of solicitor time.
After surveyor approval but before LTA execution, request a 'consent in principle' letter allowing mobilisation. Typical 1–2 week saving.
Our Office Fit-Out team prepares LTA-ready drawings, M&E schedules, method statements and compliance pack as part of our standard pre-construction package. We manage landlord-surveyor liaison through to consent-in-principle and mobilisation.
Rarely for CAT B fit-out on a standard lease — most alterations clauses state 'consent not to be unreasonably withheld'. Refusal is challengeable at the County Court under the Landlord and Tenant Act 1988. Far more common: landlord imposes conditions.
Yes — LTA obligations bind successor tenants. The assignee inherits the reinstatement obligation at lease end.
Usually yes, unless the lease specifically exempts decorative works. Check your alterations clause — some leases permit 'non-structural internal alterations' without consent.
Measured survey and fixed-price quote within 10 working days.