How to choose · Home insurance
How to work out a sensible contents sum insured
Last updated 25 October 2026 · 3 sources listed · Reading time about 3 minutes
Short answer
Contents cover is generally based on the cost of replacing items with equivalents, not their resale value. Build the total by walking through the home room by room, include rarely considered categories such as clothing, kitchenware and garage items, and flag individual items above the policy's single-item limit. Underestimating can trigger a reduced payout through an averaging clause, so revisit the total after major purchases.
Who this is for: A household setting the total value of belongings on a contents policy and wanting to avoid underinsurance or paying for cover they do not need.
What to evaluate
Replacement basis
Replacement-as-new cover pays to replace items with equivalents, while indemnity cover deducts for age and wear.
How to check: Find the settlement basis in the policy and note whether it differs for clothing or electronics.
Room-by-room inventory
People consistently underestimate the total because individually modest items add up.
How to check: Photograph each room including cupboards and drawers, then estimate replacement costs per category.
Single-item limit
Anything above the limit is not fully covered unless specified individually.
How to check: Identify items likely to exceed the limit and ask how to list them.
Averaging or underinsurance clause
If the declared total is lower than the real replacement value, the insurer may pay only a proportion of any claim.
How to check: Look for wording about average or proportional reduction.
Valuables and collections
Jewellery, watches, art, instruments and collections often need separate valuation and security conditions.
How to check: Gather receipts or appraisals and read the conditions for storage and transport.
Household changes
Gifts, inheritance, hobbies and lodgers all shift the value and sometimes the rules.
How to check: Set a reminder to review after life events and each renewal.
Comparison
| Method | Good when | Watch out for |
|---|---|---|
| Room-by-room list | You have time and want an accurate figure | Easy to miss wardrobes, cupboards, tools and seasonal items |
| Insurer's calculator or bedroom-count estimate | You want a quick starting point | Generic assumptions may undervalue a well-equipped home |
| Receipts and photographic archive | You own valuable or specialist items | Needs upkeep, and old receipts do not reflect today's replacement cost |
| Specified item schedule for valuables | A few items exceed the single-item limit | Each listed item may require an appraisal and have security conditions |
Decision worksheet
Rate up to three options against this guide’s own criteria. It runs in your browser and saves only on this device. It is a thinking aid, not a recommendation.
1. Have you checked each criterion?
0 of 6 criteria checked.
2. Compare options (0 = fails or unknown, 3 = meets it well)
| Criterion | |||
|---|---|---|---|
| Replacement basis | |||
| Room-by-room inventory | |||
| Single-item limit | |||
| Averaging or underinsurance clause | |||
| Valuables and collections | |||
| Household changes | |||
| Total (max 18) | 0 | 0 | 0 |
Questions to ask before you commit
- Does the policy pay replacement cost, or deduct for age and wear?
- What is the single-item limit, and the total limit for valuables?
- Is there an averaging clause if my declared total is too low?
- How should I list items above the limit, and what documents are needed?
- Does cover apply to belongings in a garage, shed or locked outbuilding?
- What proof will I need to submit after a loss, and does a photo inventory suffice?
- Are items belonging to guests or lodgers covered?
Typical trade-offs
Declare a generous total
- Upside
- Reduces the risk of a reduced payout after a large loss.
- Downside
- The policy charge may rise, and you may be insuring items you do not own in practice.
Choose a lean total
- Upside
- Lower cost in a year with no claims.
- Downside
- A major event such as fire could leave you substantially short of replacing everything.
Schedule valuables individually
- Upside
- Gives each item agreed protection and avoids limit disputes.
- Downside
- Adds administration and sometimes appraisal fees.
Common mistakes
- Counting only large items and forgetting clothing, linen, kitchenware, books and garage tools, which together form a large part of the total.
- Basing the total on resale value, which understates replacement cost.
- Ignoring the single-item limit for jewellery, cameras or instruments.
- Failing to keep dated photos or receipts, which slows settlement.
- Forgetting to update after buying furniture or electronics, leaving the declared total stale.
Related questions
What is the difference between replacement-as-new and indemnity settlement?
Replacement-as-new pays the cost of buying a comparable replacement without reduction for age, which is usually what people expect from home contents cover. Indemnity pays the value of the item as it was, deducting for wear and depreciation, so a worn sofa yields far less than a replacement costs. Check which basis applies to each category, since policies sometimes treat clothing or linen differently from furniture.
Do I need receipts for everything?
Not for every item, but evidence helps. Receipts, photographs, serial numbers and bank statements all support a claim, and valuables normally need stronger proof. A time-stamped video walk-through stored away from the home is useful because it survives a fire or burglary, and it makes reconstructing a list far easier.
What happens if I underestimate the total?
If the policy has an averaging clause, a partial loss may be paid at the same proportion as the shortfall between your declared total and the true replacement value. Without such a clause, you could still hit the overall limit in a major loss. Either way, an accurate total protects the payout, so review it when you buy significant items.
Are items in storage or on loan covered?
Cover for stored items is often limited in duration, location type and amount, and professional storage may need separate insurance. Items you borrow may be excluded or covered only when in your care and control. Ask the insurer to confirm in writing before relying on either situation.
Sources and further reading
These pages were reachable when we last checked. They informed definitions and rules referred to above; they do not endorse this guide. Where rules differ by country, check the authority for your location.
- Insurance Information Institute — Insurance Information Institute, retrieved 27 October 2026
- Information for consumers — Financial Conduct Authority, retrieved 27 October 2026
- California Department of Insurance — California Department of Insurance, retrieved 27 October 2026
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