The contractor is chosen, the deposit has cleared, and someone is about to swing a hammer at your house. From here on, two things multiply: dust, and paper. The dust you'll vacuum. The paper — contracts, change orders, permits, invoices, warranty cards — is quietly becoming some of the most valuable documentation you'll ever own, and most of it will arrive crumpled, emailed, texted, or handed to you on a clipboard in a driveway.
Here's what to keep, why each piece matters, and how to make sure you can still find it in seven years when a buyer's agent asks about that bathroom.
The contract and every change order — in writing, always
The signed contract is the foundation: scope of work, materials, price, payment schedule, timeline, and who's responsible for permits and cleanup. Read it before signing, then keep it where you can pull it up mid-argument, because mid-argument is exactly when you'll need it.
Then the renovation actually starts, and the plan changes — it always does. The tile is backordered, the wall turns out to be load-bearing, you decide on the nicer faucet. Every one of those changes should become a change order: a short written note of what's changing, what it costs, and both signatures. A text message thread is better than nothing; a signed one-pager is better than a text.
This isn't about distrusting your contractor. Good contractors prefer written change orders, because "I thought we agreed" is how good relationships end. The projects that land in small-claims court are almost never about the contract — they're about the changes nobody wrote down.
Permits and inspection sign-offs
If your project needs permits (structural, electrical, plumbing, and additions usually do), the permit itself and the final inspection sign-off are documents you keep for as long as you own the house. Here's why they punch above their weight:
- At sale time, buyers' inspectors and lenders look for unpermitted work. If you can't prove the deck or the finished basement was permitted and passed inspection, you may face disclosure headaches, a retroactive permit process, or a price reduction. The paper is the proof.
- For insurance, unpermitted work can complicate a claim if that work is involved in the damage.
If the contract says the contractor pulls the permits, still ask for copies — and confirm the final inspection actually happened before you make the last payment. "The inspector signed off" should come with a document, not a nod.
Invoices, payments, and lien waivers (the one nobody explains)
Keep every invoice and proof of every payment — checks, transfers, card statements. Together they're your record of what the project really cost, which matters twice: once if there's a billing dispute, and again years later, because in the US, money spent on home improvements can generally raise your home's cost basis and lower the capital gains tax when you sell. (The rules have edges — check IRS guidance or a tax professional — but you can't claim what you can't document.)
Now, lien waivers, explained simply. In most states, contractors, subcontractors, and material suppliers who don't get paid can file a lien against your house — even if you paid the general contractor in full and he stiffed the plumber. A lien waiver is a signed statement saying "I've been paid for this work and give up my right to lien the property for it."
The habit: with each significant payment, ask for a lien waiver covering that payment — and for larger projects, ask for waivers from the major subs and suppliers too, not just the general contractor. It feels like bureaucratic fuss right up until the day it's the only thing standing between you and paying for your kitchen twice.
Warranties on the work and the materials
A renovation generates two layers of warranty, and people routinely lose both:
| Warranty | Covers | Typically comes from |
|---|---|---|
| Workmanship warranty | The labor — leaks, cracks, things installed wrong | The contract itself (often 1–2 years) |
| Manufacturer warranties | Windows, roofing, appliances, water heater, flooring | Product paperwork and receipts (often 10+ years, some transferable to buyers) |
The workmanship warranty lives in your contract — one more reason to keep it. The manufacturer warranties live in the boxes and installation packets, and many require the purchase receipt and sometimes proof of professional installation to honor a claim. A transferable 30-year roof warranty is a genuine selling point — if you can produce it. There's a whole approach to keeping track of warranties so they're findable when something fails, and renovation purchases are the highest-stakes case of it — the same logic as keeping proof of purchase for any big purchase, scaled up to house-sized numbers.
Photos: before, during, and after
Take photos before demolition, and especially during — the stage where walls are open. Pictures of the wiring, plumbing, and insulation before the drywall goes up are the only record of work that gets covered over, and they answer future questions no document can: where the pipes run, whether that junction box exists, what the "before" actually looked like in a dispute about damage. After photos round out the story and make the transformation legible to a future buyer.
Thirty seconds with your phone at the end of each work day is plenty.
Where all this paper should actually live
Renovation paperwork arrives from everywhere — PDFs by email, photos of signed sheets, receipts in a glovebox — and it needs to stay findable for a decade or more. The manual method: one folder (physical or in Files) per project, and photograph every paper document the day you get it, so a coffee-stained lien waiver in a truck isn't your only copy.
This is also the kind of pile Paperlock is built for. Save the contract, the change orders, the permits, the invoices, and the warranty packets as you get them, and it reads each one — who it's from, the date, the amount — and files it without you naming or sorting anything. Years later, "how much did we pay the tile guy?" or "find the roof warranty" gets you the answer with the document attached, behind Face ID the whole time. That's the entire trick — here's how it works — and it's coming soon to iPhone.
One more reason to keep the records tidy: if you ever refinance or the renovation is part of a mortgage application, lenders and appraisers love documented improvements — permits, paid invoices, and photos turn "we redid the kitchen" from a claim into a number.
The keep-forever shortlist
If you remember nothing else, keep these for as long as you own the home:
- Signed contract and every change order
- Permits and final inspection sign-offs
- Invoices, proof of payment, and lien waivers
- Warranty documents and the receipts that back them
- Before, during, and after photos
It's one project's worth of collecting for decades of being the homeowner whose paperwork checks out — at the negotiating table, in a dispute, and on the day the roof warranty suddenly matters.