Loft conversion insurance: What cover do you need?

Do you need insurance for a loft conversion?

Yes, you need suitable insurance in place, but that does not always mean buying a separate loft conversion policy. Some home insurers will continue cover during the work, perhaps with new conditions or exclusions, while others will ask you to arrange specialist renovation insurance.

A loft conversion changes the structure and rebuilding cost of your home. During construction, it can also leave the roof exposed, introduce scaffolding and make the property less secure. Those risks may sit outside an ordinary home policy unless the insurer has agreed to cover them.

There are several different types of insurance involved, and each does a different job:

If you have a mortgage, your lender will normally expect buildings insurance to remain in place. The important point is that the cover must still be suitable once the building work starts.

When should you tell your home insurer?

Contact your insurer as soon as the design, budget and likely start date are clear. Speaking to them before signing the building contract gives you time to understand their conditions and find alternative cover if they will not insure the work.

Give them a straightforward account of the project, including:

• The total contract value and expected duration
• Structural steelwork, dormers and planned roof openings
• Whether you will remain in the property
• Any period when the home could be empty
• Scaffolding, temporary roof protection and changes to security
• The contractor's details and insurance arrangements

Your insurer may leave the policy largely unchanged, increase the premium or excess, or add conditions around security and weatherproofing. They may also exclude damage linked to the work, which is when specialist cover becomes worth discussing.

Ask what happens if the project runs late or the design changes. A policy that ends after six months will not help if the conversion reaches month seven, so any extension process and extra cost should be clear from the start.

Most importantly, get the insurer's decision in writing. You need to know what remains covered, what is excluded and what you must do while the roof is open. MoneyHelper advises homeowners to tell their insurer about major changes, including extensions and increases in rebuilding cost.

Will home insurance cover a loft conversion during the work?

It might, but you should not assume that ordinary home insurance covers every part of the project. Ask about the existing house, contents, unfinished conversion and materials separately, because they may fall under different policies.

Cover for the existing house and contents

Your buildings policy may continue to protect the original house against events such as fire or storm damage, but some policies restrict claims connected with structural alterations, faulty work or an exposed roof. The new conversion may not be treated as part of the insured building until it is complete.

Contents cover can continue while you live at home, although theft conditions may change when builders have keys or the property has temporary access points. Move valuable belongings away from the working area and check whether anything placed in storage remains covered.

Insurance while the roof is open

Opening the roof creates one of the highest-risk stages of a loft conversion. Rain can cause extensive damage in a short time, while wind and fire may also have more serious consequences when the structure is exposed.

Your insurer may require a temporary roof, weatherproof sheeting or daily checks of the covering. The building contract should say who installs, inspects and maintains that protection, including what happens overnight and at weekends.

Take dated photographs before the roof opens and continue recording the temporary protection until the permanent roof is watertight. Those images can be valuable if there is later disagreement about what happened.

Scaffolding, security and empty homes

Scaffolding gives contractors access, but it can also make upper windows easier to reach. An insurer may ask for working alarms, locked windows, scaffold alarms or restrictions on how the scaffold is accessed.

Tell them if contractors will hold keys or if doors, windows and alarms will be altered. You should also disclose any period when nobody will be living at the property.

Home policies define an unoccupied property in different ways, sometimes after a set number of consecutive days. A builder visiting during the day may not count as occupation, so ask the insurer how their own wording applies.

Building materials and unfinished work

An ordinary home policy may not cover materials waiting to be fitted or work that has not yet been completed. This is where contract works or renovation insurance may be needed.

Check whether materials are covered inside the house, outside, in storage and while being transported to the site. The building contract should also say when ownership passes to you, particularly if you pay for materials before they arrive.

The insured amount needs to reflect the cost of replacing the work and materials, not simply the amount paid so far. Otherwise, a serious loss could leave a substantial shortfall.

When might you need specialist renovation insurance?

Specialist renovation insurance is worth considering when your home insurer will not cover the project or leaves important gaps. This is more likely where the roof will be removed, the structure will change significantly or the property will be empty during the work.

A suitable policy may cover the existing house, the unfinished conversion and building materials under one arrangement. Some policies can also include liability cover, but the exact protection varies, so the schedule and exclusions matter more than the policy name.

Arrange cover before contractors arrive or materials are delivered. It should run for a realistic construction period, with a clear process for extending it if the project is delayed.

Some building contracts call for insurance in joint names, which can give the homeowner and contractor rights under the same policy. This is not automatically necessary for every loft conversion; the policy, contract and responsibilities need to be aligned by the insurer, broker or contract administrator.

How much does renovation insurance cost?

There is no useful standard price for loft conversion renovation insurance because the premium is based on the individual project. Insurers look at the home's rebuilding cost, the contract value, the length of the work, how long the roof will be open and whether the property will remain occupied.

Previous claims, listed status and unusual construction can also affect the quote. Compare what each policy covers before comparing premiums, because a cheaper policy is poor value if it excludes the existing house or the riskiest stages of the build.

If your home insurer cannot help, the British Insurance Brokers' Association can help you find a broker who deals with renovation risks.

What insurance should your loft conversion builder have?

Your builder should have insurance that reflects the work they are carrying out, the people they employ and any design responsibility they take on. Ask for current certificates before signing the contract, then check that the policies will remain active until the work is finished.

A certificate proves that a policy exists, but it does not show that every risk at your home is covered. The business name, work type, policy limit and exclusions all need to match the project.

Public liability insurance

Public liability insurance covers certain claims against the builder for injury or damage to other people's property. It may respond, for example, if negligent work damages your house or a neighbouring property.

It does not insure the conversion against every accident, nor does it automatically pay whenever damage appears. A claim still depends on what caused the loss and what the policy covers.

Check that the builder has declared roofing and structural work to the insurer, and ask how subcontractors are treated. The policy limit should reflect the potential damage to the house and neighbouring properties, not just the value of the loft conversion.

Employers' liability insurance

Most builders with employees must hold employers' liability insurance. The legal minimum is £5 million from an authorised insurer, although many policies provide a higher limit.

This cover deals with qualifying claims from employees who are injured or become ill because of their work. It protects the employer's liability; it does not cover damage to your loft conversion. GOV.UK explains the current employers' liability requirements.

Contract works and contractors' all-risks insurance

Contract works insurance can protect unfinished building work and materials against insured damage. A builder may hold it as part of a contractors' all-risks policy.

Despite the name, "all risks" does not mean every possible loss is covered. There will still be exclusions, excesses, conditions and financial limits.

Confirm that the policy covers your address, the full contract value and any materials stored away from the site. It should also be clear who receives the claim payment, especially where you have already paid for work or materials.

Professional indemnity insurance for design work

Professional indemnity insurance matters when an architect, engineer or design-and-build contractor is responsible for drawings, calculations or specifications. It can cover certain claims arising from negligent professional work.

Public liability insurance is not a substitute. Public liability deals with injury and property damage claims, while professional indemnity relates to errors in professional services.

When checking the builder's insurance, look for:

• The correct legal business name
• Policy dates that cover the expected construction period
• Roofing and structural work within the declared activities
• Limits that reflect the possible loss
• Clear cover arrangements for subcontractors
• Any project exclusions, large excesses or roof conditions
• Confirmation from the insurer or broker if anything is unclear

Who pays if the builder damages your home?

Who pays depends on what caused the damage, what the contract says and which insurance policy responds. The builder's insurer will not automatically accept every incident simply because the damage happened during the work.

Damage to the existing house

If negligent work damages the existing house, the builder may be responsible and their public liability insurer may deal with the claim. Other losses are less straightforward. Rain entering through an open roof, for example, may involve questions about temporary protection, the contract and the cover held by both parties.

Poor workmanship itself is commonly treated as a contractual issue rather than an insured loss. A policy may refuse to pay for replacing the defective work but still cover separate damage caused by that defect. Because this distinction varies between policies, it is worth asking for a practical example in writing before work begins.

Damage to a neighbouring property

Tell the neighbour and the relevant insurers promptly if damage appears, but avoid accepting responsibility before the cause has been investigated. The builder's public liability policy may respond if their negligence caused the problem.

A schedule of condition with dated photographs gives everyone a clearer record of the neighbouring property's condition before work starts. This can help distinguish existing cracks from new movement.

Party Wall Awards and non-negligence insurance

A Party Wall Award sets out how certain work near a shared structure should be carried out, but it is not an insurance policy and does not guarantee that every loss will be covered.

Loft conversions often involve inserting beams into a party wall. Our Party Wall Agreement guide explains notices, surveyors and schedules of condition.

Some contracts also call for non-negligence insurance, which covers specified damage to neighbouring property where nobody has to prove negligence. It is specialist cover and not every project needs it, so take advice from the surveyor and broker before arranging it.

What to do if damage occurs

Photograph the damage and the surrounding area before repairs begin, then take reasonable steps to prevent the situation getting worse if it is safe to do so.

Notify the relevant insurer straight away and follow their instructions. Unless emergency work is needed to protect the property, avoid authorising permanent repairs until the insurer has had an opportunity to inspect the damage.

Keep the contract, drawings, quotations, photographs, inspection reports and messages together. Clear records make it much easier to establish what happened and who was responsible.

Home insurance after a loft conversion

Tell your home insurer as soon as the conversion is complete and before any temporary renovation policy ends. The finished loft changes the size, layout and rebuilding cost of the property, so your permanent cover needs updating.

Updating the property and rebuilding cost

Give the insurer details of the new rooms, bathrooms, dormers, roof windows and structural changes. Check that the completed conversion is now included within the insured building.

Update the rebuilding cost rather than the market value. This figure covers demolition, materials, labour and professional fees if the house ever has to be rebuilt, and it may change once the loft has been added.

Building Regulations and completion documents

Keep the completion certificate, approved plans, structural calculations, electrical certificates, warranties and final invoices. An insurer may ask about approvals when arranging cover or handling a future claim.

Insurance does not prove that the conversion is structurally sound or compliant. Our Building Regulations guide explains the main structural, fire-safety and insulation requirements for a loft conversion.

Buying or selling a home with a converted loft

Missing approvals can concern buyers, lenders and insurers. If documents are missing, try to resolve the position before putting the property on the market.

An indemnity policy may address a narrow legal or enforcement risk, but it does not confirm that the work is safe and will not pay to correct poor construction. A conveyancer should review the paperwork and advise on the right route.

Loft conversion insurance for flats and leasehold homes

If you own a leasehold flat or maisonette, speak to the freeholder and whoever arranges the block insurance before developing the design. You may not own the loft or control the insurance for the roof and main structure.

Start by checking whether the loft is included in your lease. The roof itself may still form part of the freeholder's retained property even where you have access to the space.

You may also need a formal licence to alter. Planning permission and Building Regulations approval do not replace the freeholder's consent, and the block insurer will need to understand any structural work, scaffolding and roof openings.

The lease, licence, block policy and building contract all need to agree about responsibility. Check your mortgage terms too, as the lender may ask for plans, consent and proof of suitable insurance.

Our maisonette loft conversion guide covers the wider ownership and permission questions. LEASE also explains consent for leasehold alterations.

Loft conversion insurance checklist before work starts

Before contractors arrive or scaffolding goes up, make sure you can answer each of these questions:

• Has your home insurer agreed to cover the property during the work?
• Do you have their decision, conditions and exclusions in writing?
• Who insures the existing house, unfinished work and materials?
• What cover applies while the roof is open?
• What happens if the project runs late?
• Are there restrictions if the home becomes unoccupied?
• Have you checked the builder's public liability, employers' liability and contract works insurance?
• Does the builder's insurance cover roofing, structural work and subcontractors?
• Do the insurance responsibilities match the signed building contract?
• Have you photographed your home and any relevant neighbouring areas?
• Have you dealt with Party Wall notices and related insurance where needed?
• Are your plans, approvals and Building Regulations documents together?

Insurance should be discussed alongside the quote and contract, not after everything else has been agreed. When comparing loft conversion costs, ask each builder to price the same work and explain exactly what they insure.

Unsure whether a quote covers the full job? Compare local loft conversion specialists and see how their scope, contract and insurance arrangements differ.

Loft conversion insurance FAQs

Most insurance questions come down to the same two things: who is responsible and whether the policy was in place before the risk or dispute arose. The answers below cover the situations that tend to cause uncertainty once a loft conversion moves beyond the planning stage.

Does loft conversion insurance cover poor workmanship or defective work?

It will not normally pay to correct poor workmanship itself. That is generally a matter for the building contract, warranties and your rights against the builder.

Some policies may cover separate damage caused by the defective work. For example, a policy might exclude the cost of fixing a faulty joint but cover water damage caused when that joint fails. The distinction varies, so ask the insurer to explain it in writing.

Am I covered if I complete part of the loft conversion myself?

Tell your insurer before doing any of the work yourself. DIY involvement can change the policy terms, particularly where the work affects the structure, roof, electrics or plumbing.

The builder's policy will not cover work you carry out independently. You may also need to think about tools, materials and your liability if another person is injured. Building Regulations still apply to relevant work, whether you do it yourself or employ someone else.

Can I change home insurer while a loft conversion is underway?

Yes, but finding suitable cover partway through structural work can be difficult. A new insurer will need the contract value, construction stage, condition of the roof and details of any previous damage or claims.

Do not cancel the existing policy until replacement cover has started and you have confirmed that it protects both the original house and the unfinished conversion.

Does legal expenses insurance cover a dispute with a loft conversion builder?

It can, but only if the policy includes the relevant type of contract dispute and its other conditions are met. Some policies exclude building work above a certain value, and cover may depend on the case having reasonable prospects of success.

Speak to the insurer before appointing a solicitor, as they may want to approve the claim and legal representative first. Cover bought after a dispute has started will not normally apply to that existing problem. The Financial Ombudsman Service explains how legal expenses insurance works.

Do I need to tell my mortgage lender about a loft conversion?

Check your mortgage conditions before starting structural work. Some lenders require consent for substantial alterations and may ask for plans, approvals or evidence that suitable buildings insurance will remain in place.

Do not assume that permitted development removes the lender's requirements. Planning permission, Building Regulations, insurance and mortgage consent each deal with a different part of the project.