Day One Reinstatement vs Reinstatement & Indemnity UK
Why does the basis of cover decide what your claim actually pays?
Two businesses can insure identical buildings for the same figure and receive very different settlements after the same fire — because what decides the payout is not just the number, but the basis of cover behind it. Indemnity, reinstatement and day one reinstatement are three different promises about how a property claim is calculated, and the gap between them can run to six figures on a single building.
The trap is that the basis is buried in the policy schedule, rarely discussed, and easy to get wrong. Set the cover on an indemnity basis and a deduction for wear and tear can shrink your payout. Set it on a reinstatement basis without protecting against construction-cost inflation, and a sum insured that looked right at renewal can be short by the time you claim. Day one reinstatement is the mechanism built to close that inflation gap — but only if the figure underneath it is right.
This guide explains all three, shows exactly how the day one uplift works, and where it does and doesn't protect you. It's a close companion to our guide on underinsurance and the condition of average, and to business interruption, which turns on the same idea of setting values correctly. At Miller & Partner we set property cover through The Insurability Framework™ — underwriter intelligence, difficult-risk expertise, risk assessment and claims advocacy — so the basis and the figure both hold up at claim.
Day one reinstatement: key facts at a glance
- The basis of cover — indemnity, reinstatement or day one — decides what your claim actually pays.
- Indemnity pays the depreciated value (wear and tear deducted); reinstatement pays "new for old".
- Day one reinstatement: you declare the rebuild cost (the declared value), and the insurer adds an automatic uplift — often 15%–50% — to set the sum insured.
- The uplift is an inflation provision, covering rising rebuild costs during the policy period and the rebuilding period.
- Average applies on the day one declared value — so you aren't penalised for inflation occurring after day one.
- The catch: the uplift protects against inflation, not an inaccurate declared value — under-declare on day one and average still bites.
- A RICS reinstatement cost assessment, refreshed at least every five years and index-linked, is how you keep the declared value right.
What are the three bases of cover (indemnity, reinstatement, day one)?
Every property policy settles on one of these bases. Knowing which one you hold — and which one fits your building — is the single most important detail in your schedule:
| Basis | How a claim is calculated | The catch |
|---|---|---|
| Indemnity | The value at the time of loss, with a deduction for wear and tear and depreciation ("old for old"). | You don't get a new replacement — the deduction can be large on an older building. |
| Reinstatement | The full cost to rebuild or replace as new, with no deduction for wear and tear ("new for old"). | The sum insured is fixed at renewal; inflation during the year can leave you short. |
| Day one reinstatement | Reinstatement, but with an automatic inflation uplift added to a declared value set on day one. | The uplift only covers inflation — it won't rescue an inaccurate declared value. |
For most commercial buildings, the question is not "indemnity or reinstatement" — reinstatement is almost always preferable — but "plain reinstatement or day one reinstatement", and whether the underlying figure is genuinely accurate. That's where the real money is decided, and it ties directly into the commercial property cover you hold.
What is the indemnity basis, and why does wear and tear matter?
An indemnity settlement aims to put you back in the financial position you were in immediately before the loss — no better. That means a deduction for wear and tear and depreciation: if a 30-year-old roof is destroyed, you're paid for a 30-year-old roof, not a new one. For buildings, the indemnity figure can be well below the rebuild cost, leaving a gap you fund yourself.
Indemnity still has its place — for some older, lower-value or non-standard structures where full reinstatement isn't practical — but for most commercial property it leaves the owner exposed. It's also the basis a reinstatement policy can revert to if you don't actually rebuild, which catches people out after a total loss when they would rather take the cash.
What is the reinstatement basis, and where's the gap?
The reinstatement basis pays the full cost of rebuilding or replacing as new, with no wear-and-tear deduction — "new for old". It's the most common way to insure commercial buildings, and for good reason: it's what you actually need to get back to trading. But it has a quiet weakness around timing.
Under plain reinstatement, the sum insured is fixed at the start of the policy. A loss, though, might not happen until late in the year, and the rebuild itself takes many more months — and construction costs keep rising throughout. If material and labour costs climb during the policy and rebuilding period, the fixed sum insured may no longer cover the actual cost of reinstatement, and you can find yourself underinsured without having changed a thing. That is precisely the gap day one reinstatement was designed to close.
What is day one reinstatement, and how does the uplift work?
Day one reinstatement separates the figure into two parts. You declare the cost of rebuilding the property as at the first day of the policy — the declared value — and the insurer then adds an automatic percentage uplift (commonly 15% to 50%) to produce the sum insured, which is the insurer's maximum liability. The uplift is an inflation provision: it absorbs the rising cost of rebuilding both during the policy period and during the time it takes to design, plan, tender and reconstruct after a loss.
The crucial advantage is how average works. Under day one, the adequacy test is applied to the day one declared value, not to a figure that should have grown with inflation. So provided your declared value was accurate on day one, you are not penalised by average for construction-cost inflation that occurs afterwards — the uplift carries it. It's a clean, structural defence against inflation-driven underinsurance, which is why it has become so important in a period of volatile building costs.
Declared value vs sum insured — what's the difference?
This distinction trips up even experienced property owners, and getting it wrong creates a false sense of security. On a day one policy:
- Declared value — the cost of rebuilding the property on day one, including demolition and debris removal, professional fees and the cost of complying with current building regulations. This is the figure that matters, and the one the average test is applied to.
- Sum insured — the declared value plus the uplift. It's the insurer's maximum payout, but it is essentially derived from the declared value, not an independent measure of adequacy.
The danger is reading the higher sum insured as proof you're well covered. If the declared value beneath it is too low, the uplift does not fix that — it only ever addresses inflation. The declared value is the number to get right, and the number to keep right.
Does day one reinstatement protect against underinsurance?
Partly — and understanding the limit is what separates a policy that pays from one that disappoints. Day one reinstatement protects against one specific cause of underinsurance: construction-cost inflation occurring after the start of the policy. It does that well. What it does not protect against is a declared value that was wrong on day one.
If you declare a rebuild cost of £900,000 when the real figure is £1.2m, you are 25% underinsured from the outset, and the average clause still applies to cut your claim proportionately — the uplift cannot rescue a figure that was inaccurate to begin with. This is the most common and most expensive misunderstanding in property insurance: treating the day one uplift as a substitute for an accurate, professionally assessed declared value. It isn't. The two work together — an accurate declared value, protected by the uplift against subsequent inflation.
From recent placement conversations
"The most common thing I correct is a client pointing at the big number — the sum insured — and saying 'we're covered to there.' On a day one policy that number is just the declared value plus the uplift. If the declared value is light, the uplift doesn't save you; average still applies to the day one figure."
"With building costs having moved so much, I've also seen insurers quietly cut the uplift they'll offer — from 25% down to 15% or less — and ask for a professional valuation. If your declared value is years old, that combination is exactly where a shortfall hides."
Which basis of cover fits your property?
Select your property type to see the basis of cover that usually fits and the points to watch. A starting point — a professional valuation sets the definitive figure.
Commercial property owner / landlord
Manufacturer / factory
Owner-occupier business
Block of flats / RMC
Listed / heritage building
Older / non-standard construction
Is your buildings sum insured set correctly?
Tick each statement that's true of your property cover. The unticked items are where a settlement shortfall usually hides.
How exposed are you to a settlement shortfall?
A quick two-factor gauge of property settlement-shortfall exposure. Indicative only.
How do you set and keep the declared value right?
Everything in a day one policy rests on the declared value, so getting it right — and keeping it right — is the single most valuable thing you can do for your property cover. The gold standard is a professional reinstatement cost assessment carried out by a chartered surveyor, typically a RICS member. This is not the market value and not a back-of-envelope estimate; it is a costed assessment of what it would take to rebuild.
An accurate declared value has to include more than the bricks and mortar:
- The full rebuild cost of the structure to its current specification.
- Demolition and debris removal of what's left after the loss.
- Professional fees — architects, surveyors, engineers and project management.
- Compliance costs of rebuilding to current building regulations, which can exceed the original construction standard.
Then keep it current: refresh the assessment at least every five years, apply index-linking at each renewal so the figure tracks construction-cost inflation, and revalue after any extension, refurbishment or change of use. There is also a legal dimension. Under the Insurance Act 2015, you owe a duty of fair presentation, and the declared value is a material fact: presenting it accurately, ideally backed by a professional valuation, is both good protection and a legal obligation. It's the same discipline that underpins avoiding underinsurance across the whole policy.
What drives the cost of day one reinstatement cover?
Property premiums reflect the rebuild value at risk and how likely and severe a loss could be. The factors below move the price — and most can be managed with an accurate valuation and good risk management.
| Rating factor | Why it affects premium | How to manage it |
|---|---|---|
| Declared value | The headline rebuild cost being insured; higher value, higher premium. | Insure to an accurate professional figure — don't pad, don't under-state. |
| Basis of cover | Reinstatement costs more than indemnity, but pays far more at claim. | Choose reinstatement/day one for almost all commercial buildings. |
| Uplift percentage | A higher day one uplift widens the inflation buffer and the premium. | Size the uplift to realistic rebuild timescales for your property. |
| Construction type | Combustible or non-standard construction raises fire and rebuild risk. | Document construction; evidence fire protection and maintenance. |
| Listed / heritage status | Like-for-like reinstatement is far more expensive and slower. | Use a specialist heritage valuation and a larger inflation provision. |
| Age and condition | Older buildings and services carry higher loss frequency. | Maintain the building; evidence wiring, roof and structural condition. |
| Occupancy and use | Some trades and unoccupied periods raise risk. | Disclose use and any vacancy; see unoccupied property cover. |
| Location | Flood, subsidence and crime exposure vary by location. | Evidence flood defences and security where relevant. |
| Claims history | Prior property losses signal recurring exposure. | Show remediation since past losses. |
| Valuation currency | An old or unsupported figure invites loadings or restricted terms. | Hold a recent professional valuation and index-link it. |
| Quality of presentation | A clear, professionally valued submission earns better terms. | Use a specialist broker to present the risk under the Insurance Act 2015. |
What do real reinstatement claims look like?
Three anonymised but representative cases show how the basis and the figure decide the outcome.
How do you handle a property reinstatement claim?
If the worst happens, the steps below give the best chance of a full settlement on the right basis:
- Make safe and prevent further damage. Secure the property and limit further loss — you have a duty to mitigate.
- Notify your broker and insurer. Report immediately so the claim opens and a loss adjuster is appointed without delay.
- Check your basis of cover and declared value. Confirm whether you're on indemnity, reinstatement or day one, and what declared value applies — it frames the whole settlement.
- Document the damage thoroughly. Photograph and record everything, retain damaged materials where possible, and gather plans, valuations and survey reports.
- Engage the right advisers. Work with the insurer's loss adjuster, and consider your own surveyor or loss assessor for a complex or contested reinstatement.
- Agree the reinstatement scope and costs. Settle the full scope — rebuild, demolition, debris removal, professional fees and building-regs compliance.
- Reinstate the property. Carry out the works; if you choose not to rebuild, settlement may revert to the lower indemnity basis.
- Review the declared value and basis at renewal. Refresh the valuation and confirm the basis and uplift remain appropriate.
John has 13+ years' specialist commercial insurance experience, including setting property cover on the correct basis for landlords, manufacturers, owner-occupiers and managed blocks. A former #1 Account Executive at Brown & Brown and #1 Salesperson at AXA, he has direct access to the Lloyd's market and specialist property schemes, and reviews declared values and day one uplifts so buildings claims settle in full. More about John.
Day one reinstatement glossary
- Basis of cover
- The method by which a property claim is calculated — indemnity, reinstatement or day one reinstatement.
- Indemnity basis
- Settlement at the value at the time of loss, with a deduction for wear and tear and depreciation ("old for old").
- Reinstatement basis
- Settlement at the full cost of rebuilding or replacing as new, with no wear-and-tear deduction ("new for old").
- Day one reinstatement
- Reinstatement cover where a declared value is set on the first day of the policy and an automatic inflation uplift is added.
- Declared value
- The cost of rebuilding the property on day one, including demolition, professional fees and building-regs compliance.
- Sum insured
- On a day one policy, the declared value plus the uplift; the insurer's maximum liability.
- Inflation uplift
- The percentage added to the declared value to cover rising rebuild costs during the policy and reconstruction period.
- Average (condition of average)
- A condition reducing a claim in proportion to underinsurance; on day one it is tested against the declared value.
- Reinstatement memorandum
- The policy clause governing reinstatement settlement, under which cover can revert to indemnity if you don't rebuild.
- 85% condition
- A leeway in some reinstatement wordings under which average is not applied if the sum insured is at least 85% of the full value.
- Index-linking
- Automatic adjustment of the declared value or sum insured at renewal to track construction-cost inflation.
- Reinstatement cost assessment
- A professional, costed assessment (usually RICS) of what it would take to rebuild the property; the basis for the declared value.
- Debris removal
- The cost of clearing the site after a loss; a component that must be built into the declared value.
- Professional fees
- Architect, surveyor and engineering fees needed to rebuild; included in an accurate declared value.
- Market value
- What a property would sell for — distinct from, and often very different to, the cost of rebuilding it.
- Underinsurance
- Insuring for less than the full value at risk, exposing the insured to a proportionate reduction at claim.
Day one reinstatement insurance: frequently asked questions
What is day one reinstatement insurance?
It's a way of insuring buildings on a reinstatement (new-for-old) basis where you declare the rebuild cost on the first day of the policy — the declared value — and the insurer adds an automatic percentage uplift to cover construction-cost inflation. The uplift means you aren't penalised by average for inflation occurring after day one.
What's the difference between reinstatement and indemnity?
Reinstatement pays the full cost of rebuilding or replacing as new, with no deduction for wear and tear. Indemnity pays the depreciated value at the time of loss, deducting for wear and tear, so you receive less than a new replacement would cost. For most commercial buildings, reinstatement is the basis you need.
Is day one reinstatement better than standard reinstatement?
For most commercial property, yes, because it closes the inflation gap. Under plain reinstatement the sum insured is fixed at renewal, so rising rebuild costs during the policy and reconstruction period can leave you short. Day one adds an automatic inflation uplift that carries those rising costs — provided the declared value is accurate.
What's the difference between declared value and sum insured?
On a day one policy, the declared value is the rebuild cost on the first day of the policy, and the sum insured is that declared value plus the uplift — the insurer's maximum payout. The declared value is the figure that matters, because average is tested against it; the sum insured is derived from it, not an independent measure of adequacy.
Does day one reinstatement stop me being underinsured?
Only from one cause. It protects against construction-cost inflation occurring after day one, which it does well. It does not protect against a declared value that was wrong to begin with — if you under-declare on day one, the average clause still applies. The uplift and an accurate declared value have to work together.
What is the day one uplift percentage?
It varies by insurer and property, but typically falls between 15% and 50% of the declared value. The right figure reflects how long a rebuild would realistically take and expected construction-cost inflation over that time. Some insurers have reduced the uplifts they offer in recent years and ask for a professional valuation to support the declared value.
What should the declared value include?
The full cost of rebuilding to the current specification, plus demolition and debris removal, professional fees (architects, surveyors, engineers) and the cost of complying with current building regulations. It is the cost to rebuild, not the market value, and these additional costs are routinely underestimated.
How often should I revalue my property?
At least every five years with a professional reinstatement cost assessment, and sooner after any extension, refurbishment or change of use. Between formal valuations, index-linking at renewal helps the declared value track inflation — but indexation alone doesn't replace an up-to-date professional assessment.
Is rebuild cost the same as market value?
No, and confusing them is a common cause of underinsurance. Market value is what a property would sell for, influenced by location and demand. Rebuild cost is what it would take to reconstruct it, including demolition, fees and compliance. The two can differ substantially in either direction — only rebuild cost is relevant to the declared value.
What is the 85% reinstatement condition?
Some reinstatement wordings include a leeway under which average is not applied provided the sum insured is at least 85% of the full reinstatement value. It softens the penalty for modest underinsurance, but it is not a substitute for an accurate figure, and the precise wording varies between policies — always check what yours actually says.
What does day one reinstatement cost?
It's rated on the declared value, the uplift, the construction and use of the building and its loss exposure. The day one element adds a modest premium for the inflation buffer it provides. There's no flat figure — but the right question is whether the basis and declared value are correct, because an under-set policy is the expensive one at claim.
Why use a specialist broker for property sums insured?
Because the basis of cover and the declared value are where the most expensive property mistakes hide, and they only surface at claim. A specialist sets the basis correctly, ensures the declared value is professionally assessed and complete, and presents the risk to satisfy the Insurance Act 2015. Miller & Partner approaches every placement through The Insurability Framework — underwriter intelligence, difficult-risk expertise, risk assessment and claims advocacy. See our commercial insurance page.
Related guides & cover
Related specialist cover
Getting the sums insured right
Day one reinstatement only works if the rest of the policy is set correctly. These guides cover the figures insurers check after a claim.
- Underinsurance and the condition of averageHow a low sum insured cuts every claim, and how to check yours.
- Business interruption insuranceLost gross profit, indemnity periods and the BI mistakes that shrink payouts.
- Contingent business interruptionCover for when a supplier's or customer's loss stops your business.
- Commercial property insurance: cost and fire coverWhat cover costs, how fire claims pay out and the limits that apply.
Instagram
LinkedIn