Lease Plans for Mixed-Use Buildings: What Property Owners Need to Know

Mixed-use buildings combine different types of premises within the same development. For example, a London building might contain shops on the ground floor, residential flats above and shared entrances or storage areas.

When buying, selling or leasing part of such a building, it is important to understand exactly which areas are included in the agreement. A lease plan for a mixed-use building helps identify the relevant premises and distinguish them from neighbouring or shared spaces.

However, preparing a clear plan can be more complicated when several properties occupy one building. Different entrances, floors, access routes and communal facilities may all need consideration.

In this guide, we explain what owners, landlords, tenants and property professionals should check before relying on a lease plan.

What Is a Lease Plan for a Mixed-Use Building?

A lease plan identifies the property or area covered by a lease. In a mixed-use development, that area might be a commercial unit, an individual flat, an office or another part of the building.

For example, a building could contain a retail shop at street level and several residential apartments above it. Each unit may have different boundaries, access arrangements and rights over shared areas.

The lease plan should help identify the premises relevant to the particular lease. The lease itself sets out the applicable legal terms and rights.

If you are unfamiliar with these documents, read our guide to lease plan requirements and what should be included.

1. Identify the Exact Premises Covered by the Lease

The first step is to establish which part of the building the lease relates to.

This matters because two neighbouring units may share walls, entrances or service areas without forming part of the same leased premises.

For instance, a commercial tenant might occupy a ground-floor shop while the upper floors contain residential flats. The plan should clearly identify the relevant unit rather than leave the reader guessing which space is included.

Before approving a plan, check the following details:

• The property address and unit number.

• The floor or floors occupied by the premises.

• The boundaries of the leased area.

• Any included storage rooms or ancillary spaces.

• Relevant access points and shared areas.

• Consistency between the plan and the lease documentation.

If the drawing does not clearly identify the premises, ask your solicitor or conveyancer to review it before the transaction progresses.

2. Understand the Difference Between Private and Shared Areas

Shared spaces can be particularly important in mixed-use buildings.

A development may contain communal corridors, staircases, lifts, entrances, bin stores, service areas or external access routes. These spaces may serve several residential or commercial units.

However, a shared area is not automatically part of every individual lease.

The lease may include certain areas within the premises, grant rights to use them or describe separate arrangements for access and maintenance.

Therefore, check how the lease and associated plans deal with each relevant space.

For example, a flat owner may have rights to use a communal entrance without owning that entrance as part of the flat. Similarly, a shop may have access rights over a passage without the passage forming part of the shop itself.

Where these distinctions are unclear, your conveyancer should explain how the relevant documents work together.

3. Check Access to Residential and Commercial Units

Mixed-use buildings can have different access arrangements for different occupants.

A residential flat might use a communal entrance, while a shop has a separate street entrance. Some developments also contain shared service corridors or access routes for maintenance.

These arrangements can affect how the premises and relevant rights are described in the lease documents.

When reviewing a plan, consider whether it is clear how occupants reach the relevant unit. Also check whether any access route crosses an area included in another lease.

Do not assume that a route shown on a marketing drawing automatically creates a legal right of access. The lease and related documents need to be reviewed to establish the actual position.

If the building’s layout has changed, read our related guide, When to Update a Lease Plan: Property Changes, Lease Variations and Extensions.

4. Check Parking, Storage and External Areas

Mixed-use developments sometimes provide additional spaces alongside the main premises.

These might include:

• Allocated parking bays.

• Bicycle storage.

• Private terraces or balconies.

• Gardens or courtyards.

• Lockers and storage rooms.

• Loading or delivery areas.

• Refuse storage facilities.

The key question is whether the relevant space forms part of the leased premises or is subject to separate rights or arrangements.

For example, a flat may have permission to use a particular parking bay, while a shop may have access to a shared loading area. Those arrangements should not be assumed to be identical.

Compare the plan with the lease and any supporting documents. If a space is missing, incorrectly labelled or difficult to identify, ask your conveyancer to investigate.

Clear documentation can help prevent misunderstandings between owners, tenants and managing agents.

5. What If the Building Contains Multiple Lease Plans?

Larger developments may have several lease plans covering different premises.

A building could contain separate plans for individual apartments, commercial units, parking spaces or other areas. The plans may form part of different leases created at different times.

Consequently, one plan should not automatically be treated as a complete representation of every property in the development.

When reviewing the documents, check that each plan relates to the correct unit and transaction. Also consider whether any shared spaces or rights need to be understood alongside the individual plan.

If an older drawing conflicts with a newer one, do not simply choose the most recent document without further checks. The relevant leases, variations and title information may need to be reviewed together.

Our guide, How to Check a Lease Plan Before Buying a Leasehold Flat, explains what buyers should examine before proceeding with a purchase.

6. Does a Lease Plan Need Updating After Building Work?

Building work does not automatically mean that a lease plan needs to change.

The important question is whether the alteration affects the premises covered by the lease or the relevant legal arrangements.

For example, a development might undergo internal reconfiguration, change the arrangement of a commercial unit or alter the use of a shared space. Some changes may affect the physical layout without changing the legal extent of the leased property.

Other changes may require closer review.

Before commissioning an updated drawing, ask your solicitor or conveyancer to establish whether the existing plan remains suitable and whether the lease or registration documents need amendment.

An amended drawing alone may not be enough to change the legal extent of a lease.

You can read more in our article, When to Update a Lease Plan.

7. How Lease Plans Differ from EPCs and Marketing Floor Plans

A mixed-use property transaction may involve several documents. Although they can all relate to the same building, they serve different purposes.

Lease plan

A lease plan helps identify the premises covered by a lease and should be considered alongside the lease and other relevant legal documents.

Marketing floor plan

A marketing floor plan helps prospective buyers or tenants understand the layout of a property. It may show rooms, measurements and the position of doors or windows.

However, an estate agent’s floor plan is not automatically suitable for a legal lease or registration application.

Energy Performance Certificate

An Energy Performance Certificate, or EPC, provides information about a property’s energy efficiency. It is not a substitute for a lease plan.

For properties containing several residential units, energy assessment requirements may depend on the type of premises and the circumstances.

If your building contains several separately rented rooms, our guide to EPC requirements for HMO properties in London explains some of the considerations that landlords should review.

If you need an EPC for a property in London, visit Urgent EPC to explore the available services.

8. What Should You Prepare Before Requesting a Lease Plan?

Preparing the relevant information early can make it easier to identify the premises and reduce avoidable revisions.

Depending on your transaction, consider gathering:

• The current lease and any relevant variations.

• The full property address and unit reference.

• Existing lease plans and relevant title documents.

• Details of the floor or floors occupied.

• Information about included storage or parking spaces.

• Details of shared access and communal facilities.

• Records of alterations that affect the premises.

• Any specific requirements provided by your solicitor or conveyancer.

Not every transaction will require every item on this list. The appropriate documents depend on the property and the purpose of the plan.

For official guidance, consult HM Land Registry’s guidance on preparing plans.

Frequently Asked Questions

Does every unit in a mixed-use building need its own lease plan?

Not necessarily in every situation. The required documentation depends on the leases, the property arrangement and the purpose of the transaction. Ask your solicitor or conveyancer to confirm what is needed.

Should communal areas be included in a lease plan?

Relevant shared areas may need to be shown or identified where necessary to explain the premises and associated rights. Whether an area forms part of the leased premises is a separate question that should be checked against the lease.

Can I use an estate agent’s floor plan as a lease plan?

Not automatically. Marketing floor plans and lease plans serve different purposes. A solicitor or conveyancer should confirm whether a proposed drawing meets the requirements of the transaction.

What happens if two lease plans show different boundaries?

Ask your solicitor or conveyancer to investigate the discrepancy. They may need to compare the relevant leases, variations and title information before deciding what further documentation is required.

Does a lease plan prove ownership of every area shown?

No. A plan must be interpreted alongside the relevant lease and title documents. It should not be treated as conclusive proof of every ownership boundary or access right without reviewing the associated legal documents.

Final Thoughts

Lease plans for mixed-use buildings require careful attention because residential units, commercial premises and shared spaces can exist within the same development.

Before a property transaction proceeds, confirm the identity of the premises, review the boundaries and check how access, parking and communal areas are dealt with in the relevant documents.

If the existing plan is unclear or no longer reflects the arrangement described in the lease, seek professional advice before commissioning changes or relying on a replacement drawing.

For official guidance, consult HM Land Registry and speak to a solicitor or conveyancer about your specific transaction.

This article provides general information and does not replace legal advice. The documents required depend on the property, lease terms and circumstances of the transaction.