How to Organise Renovation Receipts, Invoices & Warranties

Keep the right paperwork, in the right order, so nothing slows down your sale — or your warranty claim.

RenoHub · 18 June 2026 · 6 min read

Why renovation paperwork matters more than people think

Most homeowners stuff receipts in a drawer and forget about them. Then one of three things happens: the boiler breaks down inside its guarantee period and you can't find the documentation; a product turns out to be faulty and you have no proof of purchase; or you try to sell your home and the conveyancing solicitor asks for certificates you can't locate.

All three situations are avoidable. The fix is simple: treat your renovation paperwork as an asset, not an afterthought.

The three document categories

1. Financial documents: invoices, receipts and quotes

Every payment you make — to a contractor, a merchant, a specialist — should be backed by a document. Invoices and receipts matter for several reasons:

• Budget tracking. You can only know where your money went if you have a record of it.
• Dispute resolution. If a contractor's work is substandard, an invoice showing what was agreed and paid is your starting point.
• Capital gains tax. If you sell a property that isn't your primary residence, HMRC allows you to deduct the cost of improvements from your gain. Receipts are your evidence. Always confirm your position with a tax adviser or HMRC directly.
• Product returns. Retailers like B&Q, Screwfix and Wickes have return policies, but most require proof of purchase.

As a practical rule: keep invoices and receipts for at least six years — that's HMRC's standard window for self-assessment records. For a primary residence with no CGT implications, six years still covers most contractor disputes and longer product guarantees.

2. Product warranties and guarantees

Warranties and guarantees are contracts. They have value — sometimes significant value — and they expire. The ones most worth keeping carefully:

• Boiler manufacturer warranty. New boilers typically come with a manufacturer's warranty of five to ten years, provided an annual service is carried out by a Gas Safe registered engineer. Keep the warranty booklet, the installation receipt, and every service record.
• Appliance guarantees. Fitted kitchens from suppliers like Howdens often include a ten-year structural guarantee on the carcasses. Keep the paperwork separately from the receipt.
• Roofing guarantees. Flat roof systems from specialist contractors frequently come with 10–20 year guarantees. The guarantee is often tied to the contractor's workmanship — if they go under, an insurance-backed guarantee (IBG) from a scheme like the NFRC (National Federation of Roofing Contractors) may still be valid.
• Damp treatment and timber guarantees. Specialist damp and timber companies (Rentokil, Peter Cox, and others) typically issue 20–30 year guarantees backed by insurance. These transfer to new owners — they're one of the most valuable bits of paper in a property file.
• Double glazing guarantees. These are separate from the FENSA certificate (see below) but often attached to it. Keep both.

3. Compliance certificates

These are the documents that matter most at the point of sale. A buyer's solicitor will raise enquiries — formal questions your solicitor must answer — about any structural work, regulated installations, or permitted-development claims. Missing certificates can delay or kill a sale.

The certificates most commonly requested:

• Building Control completion certificate. Required for any notifiable work under Building Regulations — extensions, loft conversions, structural alterations, new electrical circuits, new bathrooms, most boiler replacements. Issued by your local authority Building Control (LABC) or a private approved inspector once they're satisfied the work meets the regulations. Without this, a buyer's solicitor may require indemnity insurance, which adds cost and delay. Apply for completion once the work is signed off — don't assume the certificate arrives automatically.
• FENSA certificate. The Fenestration Self-Assessment Scheme covers the installation of replacement windows and doors (since April 2002). A FENSA-registered installer self-certifies compliance with Building Regulations and notifies the local authority on your behalf. You should receive a certificate in the post. If your installer wasn't FENSA-registered, you could use an equivalent scheme (CERTASS) or obtain a Local Authority Building Notice. Check the FENSA register at fensa.org.uk if you can't find your certificate.
• Part P electrical certificate. Electrical work in a home must comply with Part P of Building Regulations. Certain notifiable work — including new circuits, consumer unit replacements, and work in kitchens or bathrooms — must be carried out by a registered electrician (NICEIC- or NAPIT-registered, among others) who self-certifies and notifies the local authority. You receive an Electrical Installation Certificate (EIC). Keep it. Buyers and their solicitors ask for it routinely.
• Gas Safe records. Any gas work — boiler installation, new gas hob, flue work — must be carried out by a Gas Safe registered engineer. They should provide you with a Gas Safe certificate for the job. You can also check historic records at gassaferegister.co.uk. Keep this with the boiler manufacturer's warranty.
• Planning permission decision notice. If you obtained planning permission for your work, keep the decision notice and any approved drawings. These confirm what was approved and may be needed if there's ever a query about permitted development or enforcement.
• Insurance-backed guarantees (IBGs). These are guarantees underwritten by an insurer, so they survive if the contractor goes out of business. Common for damp proofing, underpinning, flat roofing, and structural repairs. They are attached to the property, not the owner — pass them on to the buyer at sale.

A simple filing system

You don't need anything elaborate. The principle is one place, consistently used.

Physical option: A concertina file or ring binder divided into three sections — Financial, Warranties, Certificates. Add documents as they arrive. Keep it with your property deeds or in a fireproof box.

Digital option: A folder on your phone or laptop with three subfolders. Photograph or scan documents as they arrive. Name files sensibly: 2024-09-boiler-gas-safe-cert.pdf is easier to find than IMG_4872.jpg.

Either works. The important thing is doing it in the moment, not in a panic six months later when the boiler breaks down or a solicitor sends an enquiry.

What a buyer's solicitor asks for

When you sell, your solicitor will send you a TA6 property information form and a TA10 fittings and contents form. The TA6 includes questions about alterations, planning permissions, building regulations, and guarantees. Your answers need to match the paperwork.

The most common areas where sellers come unstuck:

• An extension or loft conversion built without Building Control sign-off (or sign-off obtained but certificate never collected).
• Windows replaced but no FENSA certificate — common in older properties or where a cowboy installer was used.
• A boiler replaced but no Gas Safe record retained.
• Electrical work done but no Part P certificate — often by a handyman rather than a registered electrician.

Indemnity insurance can cover missing certificates but it costs money, it doesn't fix the underlying compliance question, and some buyers or their lenders won't accept it. Far better to keep the original document.

How RenoHub helps

RenoHub's Document Archive is built for exactly this. You upload any invoice, receipt, quote, warranty, or certificate — as a photo or PDF — and the AI identifies the amount, supplier, and purpose automatically. You can tag documents by type (financial, warranty, certificate) and mark invoices as paid, invoiced, or outstanding.

It means every piece of renovation paperwork lives in one place on your phone, organised and searchable, rather than scattered across email threads, drawers, and forgotten filing cabinets. When the boiler engineer asks for proof of the last service, or your solicitor needs the Part P certificate, you have it in seconds.

RenoHub also handles Project Documents separately — plans, drawings, planning decision notices, and contractor contacts — so your compliance file is complete, not just the financial receipts.

The app is iPhone only. Your documents are stored on-device and in your iCloud — they never touch RenoHub's servers.