Yes, you almost certainly need to act on your insurance before you renovate, and the single most urgent step is this: call your insurer before any work starts. Tell them the project type, the start date and the contract value, then check three things in your policy: existing structure cover, contract works cover, and liability. Skip this and a valid claim can be refused.
TL;DR:
- Notify your insurer before starting work, detailing the project scope, value, and timeline to avoid claim rejections or coverage gaps.
- Confirm if your property stays occupied during renovation, as this influences risk assessment and insurance premiums.
- Use specialized renovation policies for complex or high-value projects to ensure comprehensive coverage of works, contents, and liability.
- Prepare detailed documentation including contract value, builder certificates, specifications, structural reports, and permits to expedite claim processes.
- Coordinate with your builder and broker to ensure policy wording aligns with project scope and avoid delays caused by paperwork or coverage mismatches.
Table of Contents
- What does home insurance during renovation actually cover?
- When to notify your insurer and your mortgage lender
- How the different renovation policy options actually work
- What to prepare before you contact an insurer or broker
- Common exclusions and projects that need specialist underwriting
- How to choose a broker or insurer for a renovation project
- What affects the price and length of your renovation policy
- Coordinating insurance with your builder on a managed project
- What the research actually tells you to prioritise
- Extensionkings: helping you get the paperwork right
- Sources
What does home insurance during renovation actually cover?
Renovation insurance is really three or four covers stitched together, and knowing which one pays out for what stops a lot of arguments after something goes wrong.
Contract works cover protects the building work itself, materials on site, and often plant or equipment, against fire, theft, flood and storm damage while the job is under way. Existing structure cover is different, and it's the gap most homeowners miss: if you rely solely on your builder's insurance, the part of your house that isn't being worked on may not be protected the same way. Standard household policies assume a stable, finished home, and Confused that active construction introduces risks those policies were never built to handle.
Cover you'll want to check for specifically:
- Contents cover, including furniture moved into temporary storage during works
- Bespoke finishes such as handmade kitchens, stonework or custom glazing, which standard sums insured often undervalue
- Smart-home systems (wiring, hubs, sensors) that get disturbed during first-fix work
- Liability cover for injury to visitors, delivery drivers or neighbours
When to notify your insurer and your mortgage lender
Timing decides whether a claim gets paid. Here's the order to work through:
- Notify your home insurer before day one of works, giving the project nature, expected duration, and total contract value. Hiscox, for example, offers automatic cover for smaller renovation and extension projects up to an illustrative £250,000, but anything above that, or materially different in scope, needs to be declared and agreed first.
- Confirm whether the property stays occupied during works, since this changes the risk profile insurers price against.
- Tell your mortgage lender if the renovation changes your rebuild value or if you're applying for a further advance to fund it. Pepper Money notes that building-regulation completion certificates also matter later, particularly when you come to sell.
- Understand the consequences of skipping this step: insurers can reject claims outright for undisclosed works, and lenders can treat unreported structural changes as a breach of your mortgage terms.
How the different renovation policy options actually work
Most homeowners land in one of three arrangements, and picking the wrong one is usually a wording problem, not a price problem.
Household insurer add-ons work fine for smaller jobs, a new bathroom, a loft conversion without structural changes, where the insurer simply extends your existing policy to cover the works. Larger or structurally complex projects usually need a specialist renovation or contract works policy. Renovation Underwriting, for instance, offers products like Renovation Non-Neg Pro, built for higher limits and longer durations than a standard household extension can stretch to.
Some insurers, including Plum Underwriting, combine everything, existing structure, contract works, contents and liability, into a single policy wording rather than juggling separate contracts. That matters because gaps between a household policy and a contractor's policy are exactly where disputes happen.
- Household add-on: fine for low-risk, low-value works
- Specialist contract works policy: needed for structural, high-value or long-duration projects
- Combined single-policy (e.g. Plum's HomeWorks): reduces the risk of coverage gaps between insurers
Joint-name arrangements, where the contract requires you to insure alongside your builder, can also reduce the insurer's right to recover costs from a negligent contractor. Get your broker to check this before you sign anything.
Pro Tip: Ask your broker to compare the building contract wording against the insurance schedule side by side. A mismatch between what the contract requires and what the policy actually provides is the most common reason claims stall.
What to prepare before you contact an insurer or broker
Walking into that first call with the right paperwork saves days, sometimes weeks, of back and forth.
- Contract value and full programme, including start and finish dates
- Contractor insurance certificates, showing their own liability and works cover
- Rebuild valuation and a specification of finishes, especially anything bespoke
- Structural reports and any party wall awards relevant to the works
- Planning permission and building-control status, and whether the property will be occupied during construction
Brokers essentially translate your architect's brief and your building contract into the right combination of covers, and Pepper Money's guidance makes clear that grey areas at claim time usually trace back to a missing detail at this stage.
Common exclusions and projects that need specialist underwriting
Policies routinely exclude damage that happens before cover is confirmed as live, hot works (welding, blowtorches) carried out without the right precautions, and losses caused by inadequate temporary protection such as unsealed roofs or open wall cavities.
Certain project types push you straight into specialist territory:
- Basement digs and underpinning, where excavation and ground movement change the entire risk profile
- Party wall works affecting a neighbouring property
- Listed-building alterations, where consent conditions intersect with insurance terms
Pro Tip: For basement or underpinning jobs, hand your insurer the engineer's sequence of works and the temporary-works method statement, not just the word "basement". Underwriters price on the method, not the label.
How to choose a broker or insurer for a renovation project
Ask direct questions before you commit:
- Has this broker or insurer handled a project of similar scale and type, and can they point to examples?
- Does the policy cover contract works and homeowner's liability together, or will you need two separate contracts?
- What's the reinstatement basis, and how are claims actually handled once something goes wrong?
- Will you see the full policy wording, not just a summary, before you sign?
- Does the confirmed start date genuinely precede site mobilisation, with no gap between them?
A broker who's arranged cover for a similar loft conversion or rear extension before will spot wording issues a generalist insurer might miss entirely.
What affects the price and length of your renovation policy
Premiums move with contract value, the presence of basement or structural work, whether the property stays occupied, your claims history, and location. MoneySuperMarket's guidance on renovation cover confirms these are the standard rating factors across UK providers.
- Typical policy durations run from short-term, three to twelve months, up to 36 months for larger or phased projects
- Check your excess and reinstatement sum, and update your rebuild value once the works finish, since an out-of-date figure under-insures the finished home
Coordinating insurance with your builder on a managed project
Gaps between contract wording and insurance schedules usually happen because paperwork sits with three different people, the architect, the builder and the homeowner, none of whom see the full picture. On a managed extension, one team handles the programme, the contractor certificates and the method statements together, so the insurer gets a complete, consistent picture rather than fragments.
Extensionkings supplies this documentation as standard on projects across the West Midlands, including recent case studies that show the level of detail insurers and brokers typically expect. Ask for a project briefing before you approach an insurer, and you'll walk in with the answers already prepared.
What the research actually tells you to prioritise
The advice that circulates most, "just tell your insurer", undersells how much detail actually matters. A start date and a rough project description isn't disclosure. Insurers price risk on specifics: the method statement for a basement dig, the contract value down to the pound, whether the house stays occupied. Vague notification is barely better than none, because it still leaves the insurer room to argue non-disclosure if something goes wrong.
The conventional advice also treats insurance as a single event, a phone call before the diggers arrive. In practice it's a live document that needs updating as the project changes: a further advance from your lender, a revised specification, an extended timeline. Homeowners who treat the policy as fixed from day one are the ones who discover a gap exactly when they need the cover most.
If you take one thing from this, prioritise the paperwork trail over the phone call. A well-documented project, with certificates, method statements and a clear programme, gets faster claims decisions than a well-intentioned but thin conversation ever will.
— Raja
Extensionkings: helping you get the paperwork right
Extensionkings is the practical alternative to chasing certificates and method statements yourself between three different tradespeople. As a managed extension service across the West Midlands, we assemble the contractor insurance certificates, project programme and method statements your insurer will ask for, in one folder, from one team, rather than leaving you to gather them from separate subcontractors under time pressure.
Whether you're planning a kitchen-diner in Birmingham or a double-storey addition in Solihull, our house extension service covers the design, planning and build under one contract, which is exactly the kind of single, consistent paperwork trail insurers want to see. If you're in Halesowen, take a look at our Halesowen extension service and get in touch for a project briefing before you approach your insurer.
Sources
Start with your existing insurer, then a renovation specialist broker if the project is structurally complex. Keep every policy wording and contractor certificate together in one project folder.
- Home Renovation and Extension Insurance
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