Renovation projects are exciting — but they're also some of the riskiest periods your home will ever go through. Contractors are on site, walls may be open, your property may be unoccupied for weeks, and the risk of theft, fire, and accidental damage is significantly higher than normal. The problem is that your standard home insurance policy was written for a property in normal habitation — and most insurers consider major renovation work to be a material change of circumstances that can void your cover entirely.
Here's what you need to know before the first contractor sets foot through the door.
Why Standard Home Insurance May Be Invalidated
Standard buildings and contents policies typically contain clauses that exclude or limit cover in several renovation-related scenarios:
Structural work: If contractors are removing load-bearing walls, underpinning, or making significant structural alterations, many policies will exclude damage caused during or arising from that work.
Unoccupied periods: Most standard policies have an unoccupied clause — typically triggered after 30 or 60 days of continuous emptiness. Once a property is deemed unoccupied, cover for subsidence, escape of water, malicious damage, and sometimes fire is typically reduced or removed entirely.
Increased theft risk: When a property is under renovation — windows removed, scaffolding in place, contractors coming and going — theft risk increases dramatically. Insurers may argue you've failed your duty to notify them of an increased risk.
Void warranties: Some policies contain clauses that void the entire policy if you make alterations to the property without notifying the insurer.
What to Tell Your Insurer Before Work Starts
Contact your insurer before work begins and provide:
- The nature and scope of the work (cosmetic redecoration vs structural extension vs full gut renovation)
- Whether contractors will be on site and for how long
- Contractor details, including whether they hold their own public liability insurance
- Whether the property will be unoccupied during the works (and for how long)
- What materials or equipment will be stored on site
Your insurer will either confirm cover continues, apply exclusions, charge an additional premium, or tell you to seek specialist cover. Get any confirmation in writing.
Unoccupied Property Insurance
If your property will be empty for more than 30–60 days (the threshold varies by insurer), you'll likely need unoccupied property insurance.
Standard policies that do continue past this threshold typically strip out:
- Escape of water (burst pipes, leaks)
- Subsidence
- Malicious damage
- Theft (sometimes)
Unoccupied property insurance maintains broader cover but usually requires:
- Regular inspections (often every 7–14 days, logged)
- Utilities turned off (particularly water) during winter months
- Adequate security (deadlocks, window locks, alarm)
Costs are typically 25–50% higher than standard home insurance premiums.
Self-Build and Renovation-Specific Site Insurance
For significant renovations, the best solution is purpose-built site insurance (also called contractors' all risks insurance). A comprehensive site insurance policy covers:
| Cover Element | What It Protects |
|---|---|
| Contract works (materials in transit and on site) | Building materials stolen or damaged before installation |
| Plant and equipment | Owned or hired tools and machinery |
| Public liability | Third-party injury or property damage (minimum £1m, £5m+ for larger projects) |
| Employer's liability | If you're classed as an employer of contractors (legally required at £5m) |
| Legal expenses | Disputes arising from the build |
Contractor's All Risks vs Homeowner-Arranged Site Insurance
You have two options: require your contractor to hold adequate insurance (and verify it), or arrange it yourself as the homeowner.
If your contractor provides insurance, ensure you've seen the actual policy documents — not just a certificate summary. Key checks:
- Minimum £1 million public liability (£5m for larger projects or public-facing works)
- Employer's liability cover (required by law if they employ anyone)
- Policy expiry date must cover the full project duration
- Named as interested party or check the policy covers the homeowner too
Homeowner-arranged site insurance is often preferable for larger projects because you control the cover and aren't dependent on subcontractors maintaining their own policies throughout the job.
Common Gaps in Standard Renovation Cover
Even well-intentioned policies leave these gaps:
Personal accident: If you're injured on your own site while doing DIY work, standard policies don't cover this. Standalone personal accident policies or site insurance add-ons are available.
Temporary accommodation: If your home becomes uninhabitable mid-renovation, many policies don't cover alternative accommodation costs unless you specifically have this endorsed.
Legal expenses: Disputes with contractors over defective work aren't typically covered under standard home insurance. Legal expenses insurance (£30–£80/year standalone) provides access to solicitors for contract disputes.
Tools and materials stored off-site: If materials are delivered before they're needed and stored in a garage or off-site unit, check your policy specifically covers them.
How to Check Your Policy: ABI Guidelines
The Association of British Insurers (ABI) publishes guidance for consumers on what standard home policies typically include and exclude. Key questions to ask your insurer (in writing):
- Does my policy remain valid if I undertake structural renovation works?
- At what point does my property become classed as "unoccupied" and what cover is removed?
- Do I need to notify you before works begin? What information do you need?
- Is my contractor required to hold separate insurance, or am I covered for their work?
Specialist Insurance Providers
| Provider | Specialism |
|---|---|
| BuildStore | Self-build and renovation-specific insurance |
| Homeprotect | Non-standard properties including those under renovation |
| Self Build Zone | Site insurance for self-build and major renovation |
| FMB (Federation of Master Builders) | FMB members receive preferential insurance rates; hiring an FMB member means their insurance is verified |
| Hiscox | High-value home renovation cover |
Always compare at least three providers and use an independent insurance broker for complex renovation projects.
Conclusion
Renovation is one of the few scenarios where your home insurance can fail you at exactly the moment you need it most. The solution isn't complicated: notify your insurer before work starts, get their response in writing, and consider specialist site insurance for anything beyond cosmetic redecoration. The cost of proper cover — typically a few hundred pounds for a six-month project — is trivial compared to the cost of an uninsured fire, flood, or theft during a renovation.
Planning a renovation? Renovate Me helps you build a step-by-step renovation roadmap, including guidance on the admin, compliance, and contractor management that standard guides miss.