Renovation Documents Checklist: 7 Papers Every UK Homeowner Should Keep
The day you accept an offer on the house is the day your old paperwork stops being optional. The buyer's solicitor sends standard enquiries, and one of them asks for the Building Regs certificate from the loft conversion you did in 2018. You have a vague memory of receiving one. You think it might be in a drawer. You look. It isn't.
This is the future-you problem. Most renovation paperwork pain shows up not when the work is done, but years later: at sale, at insurance claim, at the moment a new builder needs to know what is behind a wall. The work itself is usually fine. The paperwork is what stalls things.
This guide is the short list. Seven documents every UK homeowner should keep, three rules about how they expire, and one printable table at the end you can save now.
Why renovation paperwork matters (and when you'll wish you had it)
There are four scenarios in which renovation paperwork suddenly matters, and they all have one thing in common: you cannot conjure the documents on the day you need them.
The first is selling. The buyer's solicitor sends a property information form and a list of standard enquiries. The enquiries ask, in different forms, whether work has been carried out, whether planning and Building Regs requirements were met, and whether certificates can be produced. If the answer is yes-with-paper, the enquiries clear in days. If it is yes-without-paper, the conveyancing slows, the buyer's solicitor presses, and you find yourself negotiating retrospective sign-off or indemnity insurance in the middle of a chain.
The second is insurance. A buildings policy assumes the property complies with the regulations in force when the work was done. If an electrical fault causes a fire and the work that introduced the fault was never signed off, the insurer's loss adjuster will ask why. Claims are not automatically refused, but the conversation is sharper, longer, and more likely to end with an exclusion than with a clean payment.
The third is future works. When a new builder opens a wall to add a socket, what they find inside should match what was certified. If the previous owner ran cabling that was never inspected, the new builder either has to bring it up to standard or work around it. Either takes longer than expected and costs more than expected.
The fourth is Capital Gains Tax. If the property is not your only or main home, the capital improvements you have made are deductible from the gain when you sell. HMRC needs the receipts. Improvements (a new kitchen, an extension, a new boiler) qualify. Repairs and decoration (replacing like-for-like, repainting) do not. The receipts you bin during a clear-out are the ones you wish you had kept.
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The seven documents every UK homeowner should keep
These seven cover what 80% of homeowners need. Some never expire; some expire on a fixed cycle; some expire on a trigger; one is kept indefinitely for tax purposes. Each item below names the document, where it comes from, when (if ever) it expires, and what you'll actually use it for.
Building Regs completion certificate
The completion certificate is issued at the end of any work signed off by Local Authority Building Control or an Approved Inspector. It names the property, the date of issue, and the scope of the work. It is your proof that the renovation met the regulations in force at the time.
You will be asked for it at sale, by the buyer's solicitor, for any work where Building Regs applied (extensions, conversions, structural alterations, central heating changes, and many electrical or window jobs that were not self-certified). The certificate never expires once issued, but it must be issued in the first place. Work that closed without a final inspection has no certificate; our Building Regs guide describes regularising that situation→.
If you have lost an original certificate, your Local Authority Building Control office can usually provide a replacement copy from their records. There is a small charge. Allow a few weeks.
Planning permission decision notice
The decision notice is the local planning authority's formal record of an application. It includes the decision (approval, refusal, or split approval), the date, and any conditions attached. Conditions matter. Some are pre-commencement (must be discharged before work starts); some are pre-occupation (must be met before the building is occupied); some are in perpetuity (a condition restricting the use of the new room, for example).
A Lawful Development Certificate is a related document. It is a statement by the local authority that work carried out under permitted development was lawful at the time. Where permitted development was the route, a Lawful Development Certificate is the equivalent of a planning decision notice for the purposes of a future sale.
Both are typically retained by the local authority indefinitely, but the original goes to you at issue. Keep it.
FENSA, CERTASS and installer guarantees
Replacement windows and external doors that meet Building Regs Part L are usually self-certified by the installer under one of the recognised competent person schemes: FENSA, CERTASS, or Assure. The certificate is the document a buyer's solicitor will accept as proof of compliance. It is typically issued within a few weeks of the work and posted to you, with a copy filed with the relevant scheme.
Installer guarantees are a different thing entirely. The manufacturer guarantees the glass, frames or sealed units against defect. The installer guarantees the workmanship of the fitting. The two are not the same, and the terms can differ significantly: a manufacturer may guarantee the unit for ten years; the installer's workmanship guarantee may run for two. Read both. Keep both. They are insurance against different things, and the one you need is whichever matches the failure you actually have.
Gas Safety certificate (CP12)
The Gas Safety record (sometimes called a CP12) is issued by a Gas Safe registered engineer after the annual service of any gas appliance, including boilers, gas hobs, and gas fires. It is legally required for landlords and rented property. For owner-occupiers, it is not a statutory requirement, but it is the document a buyer's solicitor and a new home insurer will ask to see.
It expires annually. Keeping the current certificate is enough for most purposes; some buyers' solicitors will ask for the previous one or two as well, to confirm a pattern of servicing. We would suggest keeping the past two years and discarding anything older.
A new boiler installation also produces a Gas Safe notification, filed with Gas Safe directly. That notification is your Building Regs proof for the boiler.
Electrical Installation Condition Report (EICR)
An EICR is a periodic inspection of the electrical installation of a property. It reports the condition of the wiring, the consumer unit, the bonding, and the protective devices, and grades each finding (C1 dangerous, C2 potentially dangerous, C3 improvement recommended, FI further investigation required).
For owner-occupiers, the recommended renewal cycle is approximately ten years for domestic installations, or sooner if there has been significant electrical work. For rental properties, it is five years and a legal requirement. Insurers and mortgage lenders increasingly ask for an EICR at the point of a claim or a remortgage, and some refuse cover where the property has not had one in over ten years.
A Part P certificate is not an EICR. A Part P certificate certifies that a specific piece of new electrical work meets Building Regs at the time it was installed. An EICR is a periodic safety check of the whole installation. The two are separate documents, and the confusion between them is one of the more common sources of paperwork pain at sale.
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Party Wall award
A Party Wall award is the document produced under the Party Wall etc Act 1996 when a building owner serves notice of qualifying work and the adjoining owner dissents (or both parties agree to appoint surveyors anyway). The award records the proposed work, the protections agreed for the neighbouring property, the dispute resolution process, and the surveyors' findings.
Once issued, it never expires. It binds successive owners on both sides of the wall. If you sell, the buyer's solicitor will ask for it; if you are buying a property where the previous owner had a rear extension, you should ask for it.
The original goes to you at conclusion of the surveyors' work. Keep the paper version; scan a copy. For binding advice on the Act and the award process, talk to a Party Wall surveyor.
Receipts and invoices for Capital Gains Tax
If the property is or might one day become a second home, the receipts for capital improvements are deductible from the gain when you sell. HMRC distinguishes improvements from repairs. A new kitchen replacing an outdated one is an improvement. A new kitchen replacing one of the same standard, like-for-like, is a repair. Extensions, conversions, central heating replacements, new bathrooms, double-glazing upgrades and energy-efficiency works are typically improvements. Redecoration, replacing a broken boiler with a like-for-like model, and standard maintenance are repairs.
The retention period for tax records is six years from the end of the relevant tax year, but for property the safer rule is to keep capital-improvement receipts indefinitely. A renovation receipt from 2014 may not feel important in 2020. In 2034, when you sell a former rental, it could shave several thousand off a CGT bill.
What counts as a receipt is the invoice with VAT (if any), the contractor's details, the dates, and a description of the work. Bank statements alone are not enough; HMRC wants the paper trail from the supplier.
Storage strategy: physical + scanned + tracked
Three rules cover most of this.
The first rule is that some originals are worth keeping in paper. Planning decisions, Party Wall awards, and homebuyer surveys often carry signatures, seals or stamps that a scanner does not capture as well as the original. A solicitor pressing for the original of a Party Wall award will not be satisfied with a JPEG. Keep these in a single named folder, in a drawer you know about, in a room you do not flood-risk.
The second rule is that scans of everything are the working copy. Every certificate, every guarantee, every receipt, every annual gas safety check. Scan them as they arrive. Store the scans somewhere you can find them: a cloud folder, a dedicated email label, a phone album, or all three. The friction in document retrieval is almost always the difference between the document being there and being technically there but unreachable on the Thursday afternoon when the buyer's solicitor is on the phone.
The third rule is that expiry dates need a system. An EICR every ten years, a Gas Safety record every twelve months, a boiler service annually: none of these dates is hard to remember in isolation. All of them together, across a decade, are how paperwork lapses. Calendar reminders work. A spreadsheet works. A printed wall chart works. Whatever you use, the rule is that the next renewal date lives somewhere outside your head.
We built Honely's document hub partly because the system we were running on our own job was a folder, an email label, and a calendar reminder that depended on us remembering to set it. The system worked when we paid attention to it and failed when we did not. The hub holds the documents, surfaces them by category and by expiry, and warns before a renewal date passes. If you have done enough renovation paperwork to know how easily it slips, the value of a single tracked place is obvious. For the wider order of works that produces these documents in the first place, our First Renovation guide covers planning, budgeting and sequencing→.
The printable renovation documents checklist
This is the checklist version of the seven documents above, suitable for printing or saving as a one-page reference. The table is the same content the in-app document hub uses as its default categorisation.
| # | Document | Where you get it | When it expires | Why you'll need it |
|---|---|---|---|---|
| 1 | Building Regs completion certificate | Local Authority Building Control or Approved Inspector | Never (once issued) | Sale, insurance, future works |
| 2 | Planning permission decision notice (or Lawful Development Certificate) | Local Planning Authority | Never | Sale, future works |
| 3 | FENSA / CERTASS / Assure certificate | Window or door installer | Never | Sale, insurance, replacement guarantee claims |
| 4 | Gas Safety record (CP12) | Gas Safe registered engineer | Annual | Sale, insurance, regulatory if landlord |
| 5 | Electrical Installation Condition Report (EICR) | Registered electrician | ~10 years (owner-occupier) | Sale, insurance, remortgage |
| 6 | Party Wall award | Party Wall surveyor | Never | Sale, future works, neighbour disputes |
| 7 | Capital improvement receipts | You / your contractors | Keep indefinitely | Future sale, Capital Gains Tax |
Two practical notes the table does not fit. Boiler installation and replacement add a Gas Safe notification (filed with Gas Safe, not Building Control) that functions as the Building Regs sign-off for that work; this is sometimes a separate piece of paper from the annual Gas Safety record. And the Part P certificate sits inside category 1 for notifiable electrical work; it is the installer's self-certified Building Regs sign-off, equivalent to the FENSA certificate for windows.
For binding advice on which documents are required for your specific property, talk to your solicitor when you next come to sell.
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