Fitting out a commercial space is one of the biggest expenses a business will face, and getting the paperwork wrong can cost you far more than the build itself. In London, a medium-spec office fit out now runs an average of £213 per square foot, with high-spec finishes pushing past £316. That is not a small number. It means the legal agreement governing those works — the fit-out lease or licence — is just as important as the physical construction. I have watched tenants lose weeks of trading time and thousands in legal fees because they signed a fit-out agreement without checking what happened if plans changed or the landlord delayed approval. Here is what you actually need to know.
If you are planning a fit out, you need to understand how the lease, the licence for alterations, and the fit-out agreement all interact. A mismatch between them can stop works dead. I have seen tenants assume their lease gave them permission to install partitions, only to discover a separate clause required landlord consent for any non-structural change. That is why I always recommend reading the key tips for renting office space before you even start negotiating the fit-out terms. A tenant landlord lawyer can review the documents and flag conflicts early, which is far cheaper than fixing them mid-build.
What a fit-out agreement actually covers
The most important thing to understand is that a fit-out agreement is not the same as the lease. It is a separate document that turns the landlord’s broad consent into workable rules for carrying out the works. It usually covers approval of plans, access for contractors, responsibility for damage, compliance with building regulations, and what happens to the works at the end of the lease. If the fit-out paperwork does not align with the lease and building requirements, you can face a stop on works, extra costs, or a dispute over reinstatement later.
Landlords insist on detailed terms because they are protecting the building, other occupiers, and the long-term value of the property. They want control over noise, dust, access routes, working hours, fire safety, and any change that affects structure or shared systems. The landlord’s standard fit-out agreement often starts from a very protective position. My advice is to expect to negotiate where the clauses shift too much cost or risk onto your business, especially around timing, reinstatement, professional fees, and open-ended indemnities. If you are unsure about any clause, a property lawyer can help you understand what is standard and what needs changing.
Why getting the fit-out lease right matters for your bottom line
The cost of getting it wrong goes far beyond the build budget. Tender prices have risen by 17% since 2020, meaning any delay caused by a paperwork dispute adds significant expense. Raised interest rates have also pushed up borrowing costs, so a project that runs over schedule can hit your cash flow hard. Across the Big Five and South East office markets, anticipated rental values in under-construction schemes are an average of 20% above local prime rents recorded in Q1 2022. That means if your fit-out is part of a new lease, the rent you are paying reflects those higher values — and you need the space operational as soon as possible to justify the cost.
Consider a business taking a medium-spec office in Manchester, where fit-out costs average £180 per square foot. For a 5,000 sq ft space, that is £900,000 in fit-out costs alone. If the fit-out agreement does not clearly state who obtains building control approval, and the landlord rejects the contractor’s plans two weeks into the build, the tenant could face weeks of delay and thousands in additional contractor fees. I have seen this happen more than once. The fix is simple: make sure the agreement states who is responsible for each approval before you sign.
What I tend to notice is that tenants focus on the rent and the lease term, but treat the fit-out agreement as a standard form they have to sign. That is a mistake. The fit-out agreement is where the real operational risk lives. If you are in a managed building or a retail park, the landlord’s conditions around access hours, waste disposal, and noise can seriously constrain your build programme. A shared retail lease agreement often has additional restrictions that affect fit-out timing, so check that document too.
Where tenants commonly go wrong with fit-out agreements
Most disputes I see come down to a handful of recurring mistakes. Here are the ones that cause the most trouble.
Assuming the lease gives you full permission to alter
Many commercial leases already restrict structural alterations, external changes, or changes affecting services without consent. Tenants assume that because the lease says “alterations permitted with consent,” they can proceed. But the lease may also require a separate licence for alterations, and the fit-out agreement may add further conditions. If one document says the works can proceed and another says they cannot start without further approval, the more restrictive position still applies. Always check the lease first, then confirm what additional documents the landlord requires. A business lawyer can review the lease and the fit-out agreement together to spot conflicts.
Leaving the scope of works vague
Vague wording in the approved works description causes disputes later, especially if you want to change materials, move service routes, or add extra items once works begin. The agreement should include dated plans, specifications, and a schedule of materials. It should also state whether minor variations need fresh approval, who at the landlord’s side can approve changes, and whether approval can be delayed without a clear response deadline. If the agreement gives the landlord wide discretion to require changes at any time, that creates budget and programme risk. I would push for a clause that requires the landlord to respond to variation requests within a set number of working days.
Ignoring superior landlord and third-party consent
Your immediate landlord may not be the only party whose consent matters. In some buildings, a superior landlord, management company, or mortgage lender may also need to consent to the works. If you start the fit-out without all necessary approvals, you could be in breach of the lease. The fit-out agreement should confirm that all necessary consents have been obtained, or set out a clear process for obtaining them. This is especially common in managed buildings, shopping parades, and mixed-use developments.
Not clarifying reinstatement obligations
At the end of the lease, the landlord may require you to reinstate the premises to their original condition. If the fit-out agreement does not specify the standard of reinstatement, you could face a large bill for removing partitions, flooring, cabling, and other fixtures. Some agreements require reinstatement to a “shell and core” condition, which is expensive. Others allow you to leave the fit-out in place. The agreement should state clearly what must be removed and what can stay. If you are planning a high-spec fit-out, this is a critical negotiation point.
→ Scroll right to see all columns
| City | Low spec (£/sq ft) | Medium spec (£/sq ft) | High spec (£/sq ft) |
|---|---|---|---|
| London | £129 | £213 | £316 |
| Manchester | £109 | £180 | £268 |
| Birmingham | £106 | £175 | £260 |
| Glasgow | £101 | £166 | £247 |
The table above shows how fit-out costs vary by city and specification level. Notice that the gap between low and high spec is significant in every market. If you are negotiating a fit-out incentive with the landlord, these figures give you a benchmark for what is reasonable.
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How to negotiate a fit-out agreement that protects your business
Here is the practical process I recommend for getting the fit-out agreement right, from initial review through to signing.
Align the fit-out agreement with your building contract
Your building contract with the contractor, including the programme, cost allocation, and responsibility for defects, must match the conditions in the fit-out agreement. If the fit-out agreement says works must be completed within eight weeks, but your contractor’s programme shows ten weeks, you are in breach from day one. The same applies to access windows, working hours, and noise restrictions. Before you sign the fit-out agreement, share it with your contractor and ask them to confirm they can meet the conditions. If the landlord requires specific contractor approvals or insurance levels, make sure your contractor can provide them. A real estate lawyer can help you align the two documents.
Negotiate the reinstatement clause early
Reinstatement is one of the most expensive surprises at lease end. The fit-out agreement should state whether you must remove the works and restore the premises to their original condition, and if so, to what standard. If the landlord wants reinstatement to “shell and core,” that means removing everything down to the bare structure — including flooring, ceilings, partitions, and MEP installations. That can cost nearly as much as the original fit-out. My advice is to negotiate for a “license to alter” that allows the landlord to keep the improvements at lease end, or at least limits reinstatement to specific items like signage and data cabling. If the landlord insists on full reinstatement, factor that cost into your lease term decision.
Check the insurance and indemnity provisions
The fit-out agreement will include insurance obligations, indemnities, and liability for injury, delay, defects, and damage to common areas or neighbouring units. These clauses often shift significant risk onto the tenant. Look for open-ended indemnities that could make you liable for losses the landlord’s insurance should cover. Also check whether the agreement requires you to insure the works during construction, and whether your contractor’s insurance meets the specified levels. If the agreement says you are responsible for damage to neighbouring units caused by your fit-out, make sure your public liability insurance covers that risk. A health insurance specialist is not the right person for this — you need a broker who understands commercial property insurance.
Consider a landlord-funded fit-out incentive
There are increasing examples of landlords working with tenants to take on the upfront capital expenditure required for fitting out the space, providing this as an incentive with the cost then spread across the lease term. This is particularly relevant given the shortage of contractors and the high cost of borrowing. The upfront expense is often more palatable for landlords because they typically take a longer view, and the structure of the deal invariably requires a longer lease term than they might otherwise achieve. For tenants, this means moving into a bespoke space without a substantial upfront cost, and the increased rent falls under operating rather than capital expenditure, which sits better on the balance sheet. If your landlord offers this, compare the total cost over the lease term against a traditional rent-free period. A financial advisor can help you model the numbers.
- 1Review the lease for alteration restrictionsCheck whether the lease already restricts structural alterations, external changes, or changes affecting services. Identify what additional consents are needed.
- 2Get the fit-out agreement in draft before you sign the leaseDo not sign the lease without seeing the fit-out terms. If the lease commits you to a fit-out programme you cannot meet, you are already in breach.
- 3Attach detailed plans and specificationsMake sure the approved works are described clearly and attached to the agreement. Include dated plans, a schedule of materials, and a clear process for variations.
- 4Confirm all consents are in placeCheck whether a superior landlord, management company, or mortgage lender also needs to consent. Get written confirmation before works start.
- 5Align the programme with your contractorShare the fit-out agreement with your contractor and confirm they can meet the access windows, working hours, and completion deadlines.
Frequently asked questions about tenant fit-out leases
Can I do a fit-out without a separate fit-out agreement? ▾
What happens if my fit-out runs over the agreed completion date? ▾
Who pays for building control approval and planning permission? ▾
Can the landlord change the fit-out rules after I have started work? ▾
Do I need a lawyer to review a fit-out agreement? ▾
Sources and Further Reading
Tips for understanding market rent in the UK — How rental values are set and what that means for your fit-out budget.
Understanding the role of anchor tenants in UK commercial rentals — How anchor tenant status can affect fit-out incentives and lease terms.
Fit out agreements: key legal issues for UK commercial tenants. Sprintlaw, 2024.
EMEA Occupier Fit-Out Guide 2026. Colliers, 2025.
Fitting in the fit out: economic trends and real estate impact. Cushman & Wakefield, 2024.
