A house mid-renovation is a different security problem from a finished home. Doors and windows are routinely left open or missing for days at a time, the property may be unoccupied for long stretches, there are valuable tools and materials on site, and every tradesperson working on the project is someone with legitimate access who isn’t you. It’s also one of the few periods where getting security wrong can quietly void your insurance, not just invite a break-in.
Why standard home insurance often doesn’t cover this period
Most standard UK buildings and contents insurance policies are written around a home being occupied and in normal condition. Significant structural work – an extension, a loft conversion, a full rewire with walls opened up – changes the risk profile enough that insurers typically expect to be told about it, and many will not automatically continue full cover once work starts. If the property will also be left empty for an extended period during the work (commonly 30 days or more triggers this under many UK policies), that shifts the situation again into “unoccupied property” territory, which standard policies usually exclude or restrict, requiring separate unoccupied-property or renovation-specific cover instead. Starting significant work without telling your insurer first is one of the more common ways people accidentally invalidate cover – not through any dishonesty, just not realising notification was required.
Specialist renovation or unoccupied-property policies that do cover this period commonly attach their own security conditions as part of the contract – regular inspections at a stated interval, the property being kept secure and weathertight, and sometimes a requirement that the site is not left completely empty overnight during certain phases. These conditions are enforceable: a claim can be reduced or refused if you didn’t meet them, so it’s worth reading the policy’s specific wording rather than assuming general good faith is enough.
What’s actually being targeted on a home renovation site
The theft risk during renovation isn’t the same as a normal burglary. Site security guidance developed with UK police forces (the Secured by Design construction site guidance and the National Business Crime Centre’s construction site guide, both aimed primarily at larger commercial sites but directly applicable to a home renovation) consistently flags the same recurring targets on residential jobs:
- Power tools and cordless equipment left in a van, cabin or unsecured room overnight – increasingly targeted because modern cordless tools are compact, resellable and often not individually marked.
- Copper pipe, cabling and other scrap-value materials stored on site before installation.
- Ladders and access equipment left against the building, which can then be used to reach upper floors or roof lights.
- Skips and building materials at the front of a property, which signal an active, distracted household to anyone passing.
Practical steps during the work
Physical measures
- Fit temporary secure screens or robust hoarding over any door or window opening left exposed overnight, rather than relying on tarpaulin or plastic sheeting alone.
- Lock tools and portable equipment inside the property, a locked site cabin, or take them off-site each night rather than leaving them in an open room or an unlocked van.
- Store ladders securely, chained or brought indoors, so they can’t be used as an access tool against your own building.
- Keep valuables, documents and anything genuinely irreplaceable away from the areas contractors are working in and out of, rather than assuming a “trusted tradesperson” environment removes the need.
Access and people management
- If you’re using a key safe for contractor access rather than being on site, treat the code the same way covered in our guide to key safes for tradespeople and carers – change it once the relevant phase of work finishes.
- Keep a simple record of which contractors and subcontractors currently have access, since renovation projects often involve people you’ve never met directly (a plumber’s mate, a delivery driver) rather than just the firm you contracted with.
- If the property is unoccupied for stretches during the work, ask a neighbour to keep half an eye on it and vary the times you or the site manager check in, rather than a predictable daily pattern.
In the US: broadly the same risks, different insurance mechanics
US homeowners face the same physical risks – tool theft, exposed openings, unsecured materials – but the insurance mechanics differ by carrier and state rather than following one national pattern. Many US insurers require a rider or a separate builder’s risk policy for significant renovation work, and, as in the UK, failing to notify the insurer before major structural work begins is a common reason a claim is later disputed. Because home insurance regulation and standard policy wording vary significantly state to state in the US, the specific notification and unoccupancy thresholds are worth confirming directly with your insurer rather than assuming a figure that applies in one state applies everywhere.
Before work starts: a short checklist
- Tell your insurer about the scope and expected duration of the work before it starts, and ask directly whether your existing policy still applies or whether you need renovation/unoccupied-property cover.
- Ask what security conditions (inspection frequency, minimum security standard) are attached to any specialist policy, and follow them exactly.
- Agree with your contractor who is responsible for securing tools and materials overnight – don’t assume it defaults to either party.
- Plan for exposed openings before they happen, not after the first night they’re left uncovered.