You’ve found a buyer for your flat, or you’re moving to a better mortgage deal. Then your conveyancer comes back with news you didn’t expect: there’s a problem with the lease. Not with the building, but with the document itself. A defective lease can hold up a sale or a remortgage for weeks or months. Often the owner had no idea the problem existed when they bought.
This guide explains what a defective lease is, why it tends to surface only when you sell or remortgage, how it’s usually put right, and why the question of what happened when you bought is worth asking.
If you’re new to the topic, our earlier guide to selling or remortgaging a flat with a defective lease covers the basics.
What is a defective lease?
A lease has to do a lot of work. It defines what you own, gives you rights over the rest of the building, and obliges someone to insure and repair it. A lease is described as defective when one of those jobs is missing or badly done.
The key point is that a defective lease is a problem with the paperwork, not the bricks and mortar. You can live in a flat for years without noticing anything wrong.
Common examples of lease defects
Lease defects take many forms, but some come up again and again:
- An unclear description of what you own. The lease doesn’t say whether the floor joists, the walls between flats, or the entrance and stairs are part of your flat (your “demise”).
- Uncertain responsibility for the roof or structure. Nobody can say for sure who must repair them.
- Defective service charge proportions. The shares don’t add up or can’t be worked out.
- Missing rights of access or services. You’re obliged to keep your part in repair, but the lease gives you no right to enter other parts of the building to do it.
- No satisfactory obligation to insure and reinstate. The lease doesn’t require the building to be rebuilt after damage, or it delays your share of the insurance money for years.
- No workable way to enforce comparable covenants against the owners of other flats.
- No mortgagee protection clause. The landlord could take steps to forfeit the lease without first notifying your lender, which affects the lender’s security.
Why a defective lease shows up when you sell or remortgage
Defects rarely matter in daily life. They matter in a transaction, because a buyer’s conveyancer must report on the lease and lenders have requirements about particular lease provisions.
The problem usually surfaces in one of these ways:
- a mortgage offer comes with a condition about a specific clause, or the absence of one, and nothing moves until it’s dealt with;
- a buyer’s solicitor raises questions about what exactly you own;
- the landlord or another necessary party won’t agree to put the lease right.
So a gap that never troubled you can suddenly stop everything.
How a defective lease is usually fixed
Deed of variation
The usual solution is a deed of variation: a legal document, agreed by the landlord and any other parties whose rights are affected, that amends the lease. If the flat is mortgaged, lender consent may also be needed. A variation takes time, so it’s worth starting early. If you’re also extending your lease, some changes may be dealt with at the same time.
Tribunal or court
A lease can be varied only by agreement between the parties or, in limited circumstances, by order of a tribunal or court. This route may be an option where agreement can’t be reached, but it is not available in every case.
Defective lease indemnity insurance
Where a variation isn’t available, a defective lease indemnity policy is sometimes suggested. It’s important to understand what this does and doesn’t do:
- it does not amend the lease, supply a missing right, or oblige the landlord to act;
- it responds only to the defined loss, on the terms stated in the policy;
- it may protect the lender without giving equivalent protection to you;
- it may not satisfy every lender.
The cost depends on the particular defect, the property value, the cover required and the insurer.
What to do now if a defect is holding things up
Start by getting the defect pinned down in writing. You need to know which provision is missing or inadequate, what the lender’s requirements say about it, and whether it affects the whole building or only your flat.
If you’re selling, your conveyancer can ask the buyer’s solicitor what remains unresolved and whether it comes from the buyer’s lender’s requirements. If you’re remortgaging, your conveyancer can check your proposed lender’s requirements directly.
Looking back: what happened when you bought?
If the defect was already in the lease when you bought, it may have been identifiable from the documents at the time. That raises some fair questions:
- Was the defect identified, and were you told about it?
- Was it established what you actually owned, including joists, dividing walls and stairs?
- Was the landlord or seller asked for a deed of variation, and what was the answer?
- If indemnity insurance was taken out instead, did it protect you, or only your lender?
- Were you told the defect would stay on the lease and could come up again when you sold or remortgaged?
Records from the time can help answer these questions. They include the lease and any supplemental deeds, your report on title, your conveyancer’s enquiries and replies, and any deed of variation or indemnity policy.
These are examples, not a checklist of what every buyer should have been told. What mattered in an individual purchase depended on its circumstances.
Why the year you bought matters
Getting a mortgage when you bought doesn’t necessarily mean the property was readily mortgageable across the wider market. Lenders set out in writing what they expect conveyancers to do about lease provisions. Those instructions weren’t uniform, and they change regularly. Superseded versions also drop out of public view, which makes it hard to answer a simple question: what was my conveyancer told in the year I bought?
When I Bought, a Lexsure service, has retained historical lender-specific conveyancing requirements since April 2007. Its archive records 113 lenders changing their defective lease requirements in England and Wales, with 303 recorded changes between 2009 and 2026. As an illustration, one lender’s wording in force from 2012 to 2016 read:
“You must contact us for instructions as to whether or not we will accept indemnity insurance in any particular case where the lease terms are defective.”
That is one lender’s wording only. What applied to your purchase depends on your lender and your completion date.
Find out what your lender required when you bought →
What this does and doesn’t mean
Historical lender requirements don’t, by themselves, show that anyone was negligent or that you have a claim. Those questions need the original file and legal advice. What your conveyancer had to tell your lender and what they had to tell you are also different questions.
Time limits apply. In some cases, the date you first knew enough about the problem matters as well as the date you bought, so it’s better not to wait.
Stuck with a defective lease?
You don’t need to know whether anyone was at fault. When I Bought offers a conversation first, usually about twenty minutes. There’s no report to buy and no claim to start. Tell them what happened and when you bought.
Tell us what happened when you bought and arrange a call
Frequently asked questions
What is a defective lease?
A lease where one of its essential jobs, such as defining what you own, granting rights over the building, or requiring insurance and repair, is missing or badly done. It’s a problem with the document, not the building.
Can I sell a flat with a defective lease?
Often, but the defect usually has to be dealt with first. That is typically done with a deed of variation, or sometimes with indemnity insurance if the buyer’s lender accepts it.
Can I remortgage with a defective lease?
It depends on the proposed lender’s requirements, which differ between lenders and change over time. Your conveyancer can check them directly.
Does defective lease indemnity insurance fix the lease?
No. It doesn’t amend the lease or supply missing rights. It responds only to the defined loss in the policy, and it may protect the lender rather than you.
How long does a deed of variation take?
It varies. It needs agreement from the landlord and other affected parties, and possibly lender consent, so start as early as possible.
This article is general information, not legal advice about your property. When I Bought is not a law firm.