Renters' Rights Act 2025, Phase 1 commencement
Transition readiness pack

Commercial Property Transactions

Heads of Terms in Commercial Property — UK Landlord and Tenant Guide

Heads of terms (heads of agreement; letter of intent; memorandum of terms): summary of key commercial points agreed before formal legal documentation in commercial property transactions (new lease; renewal; licence to alter; sale and leaseback). Almost always 'subject to contract' — non-binding until formal exchange of contracts; Pitt v PHH Asset Management [1994] 1 WLR 327 (CA): 'subject to contract' prevents binding agreement; either party can withdraw at any time before exchange without liability for the deal. Lock-out agreement: separate binding exclusivity — landlord agrees not to deal with others for specified period (typically 6–12 weeks); must be supported by consideration; Walford v Miles [1992] AC 128 (HL): English law does not impose general duty to negotiate in good faith. Key commercial terms: property; term; rent; rent-free period; rent review (frequency; mechanism); break clauses (dates; conditions; penalty-free); repairing obligations (FRI vs other; schedule of condition); service charge; permitted use; alienation; alterations; guarantors; deposit; SDLT; legal fees; conditions precedent. Binding elements within non-binding heads of terms: confidentiality; lock-out clause; abortive costs liability — must be clearly identified as binding. RICS Code for Leasing Business Premises (2020): recommended form of heads of terms; voluntary best practice code. LTA 1954 renewal: heads of terms record new rent and terms; signed rent review memorandum is binding from execution. Scotland: missives (not exchange of contracts) constitute binding contract; heads of terms remain non-binding in practice.

10 min readUpdated 7 June 2026Last reviewed: 17 May 2026heads-of-termssubject-to-contractlock-out-agreementcommercial-lease

Are Heads of Terms Legally Binding?

Almost all commercial property heads of terms expressed 'subject to contract' — non-binding in English law until formal contracts are exchanged (lease or agreement for lease). Pitt v PHH Asset Management [1994] 1 WLR 327 (CA): 'subject to contract' prevents binding agreement even if all commercial terms agreed. Withdrawal risk: either party can walk away before exchange without legal liability for the deal; wasted costs may be recoverable in limited circumstances. Lock-out agreement: separate binding agreement — landlord agrees not to deal with others for defined period (typically 6–12 weeks); must be supported by consideration. Walford v Miles [1992] AC 128 (HL): English law does not impose general duty of good faith in commercial negotiations; underlines importance of binding lock-out agreement.

What Heads of Terms Should Cover

RICS Code for Leasing Business Premises (2020) recommends heads of terms cover all principal commercial terms before solicitors are instructed. Key terms: property (address; floor area; specification; excluded areas); term (length; commencement; options to extend); rent (per annum exclusive; VAT; payment dates); rent-free period (duration; conditions); rent review (frequency; mechanism — OMV upward-only; CPI; fixed step-up; reference date); break clauses (dates; exercisable by landlord/tenant/both; pre-conditions; notice period); repairing obligations (FRI vs internal repairing; schedule of condition); service charge (mechanism; cap); permitted use; alienation (qualified/absolute); alterations; guarantors; deposit; SDLT responsibility; legal fees; conditions precedent (planning; landlord's works).

Binding Elements Within Non-Binding Heads of Terms

Specific provisions within non-binding heads of terms can be expressly stated to be binding: confidentiality obligation (both parties not to disclose deal terms); lock-out clause (binding exclusivity for tenant — specify period and conditions); abortive costs liability (obligation to pay other party's professional costs in specified circumstances). Must be clearly identified as binding — ideally in separate agreement or clearly delineated provisions. Implied waiver of 'subject to contract': rare but possible where parties act as though deal is concluded — Sherbrooke v Dipple (1980). Conditions precedent: heads of terms can be conditional (but binding) on specified events — planning permission; completion of landlord's works.

RICS Code for Leasing Business Premises

RICS Code for Leasing Business Premises (England and Wales, 2020): voluntary best practice code; encourages heads of terms before solicitors instructed; provides recommended form of heads of terms; promotes fair and balanced lease terms — e.g., break clauses not conditional on full covenant compliance; clear rent review mechanisms; reasonable alterations consent procedures. Not legally binding: but institutional landlords and professional advisers generally follow it. Scotland: RICS Scotland publishes separate guidance; Scottish leases governed by Scots law; heads of terms practice similar but legal documentation process differs (missives not exchange of contracts).

Heads of Terms for Lease Renewals and Rent Reviews

LTA 1954 renewal: heads of terms record agreed new rent; term; changes to existing lease; tenant improvements to be disregarded at rent review. Non-binding until new lease executed — existing tenancy continues by statute throughout. Rent review heads of terms: informal agreement of reviewed rent during negotiations is 'subject to contract'; signed rent review memorandum: binding from date of execution; backdated to review date; interest on the difference may accrue; appended to lease. Pre-action: heads of terms agreed in LTA 1954 renewal negotiations may be taken into account by court in fixing terms of new lease. Licence to alter: heads of terms record specification of proposed works; reinstatement obligation; landlord's oversight rights; approval process.

Frequently asked questions

Are heads of terms legally binding in commercial property?+

No — almost always expressed 'subject to contract', which means neither party is legally bound until formal contracts are exchanged. Either party can withdraw before exchange without legal liability for the deal (Pitt v PHH Asset Management [1994]). Specific provisions (confidentiality; lock-out; cost liability) can be made expressly binding.

What is a lock-out agreement in commercial property?+

A lock-out agreement is a separate binding agreement under which the landlord agrees not to negotiate with any other party for a defined period (typically 6–12 weeks), giving the tenant time-limited exclusivity to exchange contracts. It must be supported by consideration. Without a lock-out, the landlord can deal with other parties even after heads of terms are agreed (Walford v Miles [1992]).

What should commercial property heads of terms include?+

Key commercial terms: property description; term; annual rent; rent-free period; rent review mechanism; break clause dates and conditions; repairing obligations; service charge; permitted use; alienation provisions; alterations; guarantors; deposit; SDLT responsibility; conditions precedent. The RICS Code for Leasing Business Premises (2020) provides a recommended form covering all principal points.

Found a gap or disagree with something?

Reply to any LetSafe email or write to Richard@letsafeuk.co.uk. We rewrite guides when we get something wrong, the sooner we hear, the sooner we fix it.

Hand-picked by topic overlap with this guide.

Commercial Property Management
Commercial Service Charges for Landlords UK
Commercial service charge in multi-let commercial buildings: contractual basis (not statutory LTA 1985); RICS Code of Practice for Service Charges in Commercial Property (3rd edition, 2018); recoverable costs (management fees 10–15%; maintenance; insurance; utilities; sinking fund); excluded costs (latent defects; improvements; void unit costs); certification by qualified accountant within 4 months of year-end; sinking fund on trust; caps and collars; dispute resolution: expert determination; RICS arbitration (no FTT jurisdiction for commercial).
Commercial Property
Rent Review Dispute UK — Arbitration, Expert Determination, and the Time-of-the-Essence Trap
What happens when landlord and tenant cannot agree on the reviewed rent — RICS arbitration vs expert determination, the Starmark time-of-the-essence trap, and how comparables evidence is used.
Commercial Insolvency
Insolvency Disclaimer of Lease UK — Liquidator Powers, Guarantor Liability, and Vesting Orders
Understand how IA 1986 s.178 disclaimer works, why guarantors are not released (Warnford v Duckworth), how subtenants apply for vesting orders under s.181, and how landlords rank as unsecured creditors after disclaimer.
Commercial Property Law
Dilapidations Commercial Lease UK — Terminal Dilapidations, the s.18 Cap, Scott Schedule, and Break Clauses
Covers terminal vs interim dilapidations; the Jervis v Harris clause (cost recovery as a debt during the term); Scott Schedule process and RICS Protocol; LTA 1927 s.18(1) diminution in value cap and supersession (Ultraworth [2000]); and the critical interaction between break clauses and dilapidations compliance conditions.
Commercial Property Law
Commercial Lease Guarantor UK — AGA on Assignment, Guarantee Provisions, and PCO Obligations
Covers types of guarantee in commercial leases (corporate; personal; rent deposit; AGA); the LT(C)A 1995 framework for post-1995 Act leases; AGA mechanics and the one-deep guarantee chain; s.17 fixed charge notice within 6 months; overriding lease right under s.19; guarantee caps; and enforcement steps against corporate and personal guarantors.
Commercial Property Law
Commercial Lease Rent Review UK — Upward-Only Reviews, Open Market Value, and Review Disputes
Covers types of rent review mechanism (upward-only open market; RPI/CPI-linked; turnover; fixed uplift; collar and cap); the open market review assumptions and disregards (vacant possession; tenant improvements; LTA 1954 s.34 basis); trigger notices and time-of-the-essence traps; counter-notice default; and dispute resolution by expert determination (RICS) vs arbitration (Arbitration Act 1996).