The 12 Things That Must Be in Writing Before You Sign a Siding Contract

Most siding disputes don't come from fraud. They come from vague contracts that let both sides honestly disagree about what was promised — and when the job is done, there's no document clear enough to settle it.

Why "Replace the siding — $16,500" is not a contract

A legitimate contract has to specify scope, quality, and recourse. A one-line quote has none of those. "Replace siding" tells you nothing about which product, which house wrap, whether existing trim and flashing get reused, or who pulls the permit. If you and your contractor disagree six months after completion — about whether the windows were properly flashed, or whether new sheathing was supposed to be included — the scope has to exist in writing or nobody's right. Courts and arbitrators can only work with what's on paper.

Before you sign anything for a $12,000–$40,000 siding job, the contract should answer every one of the following twelve questions. If it doesn't, ask for an addendum in writing before the first panel goes up.

The 12 line items a legitimate siding contract includes

1. Exact material brand, product line, profile, and color

Not "vinyl siding." The contract should read something like CertainTeed Monogram, double-4 profile, Sterling Gray — and if the contractor will provide it, the product number. This matters because product lines within a single brand carry different warranties, different panel thicknesses, and different price points. A contractor can substitute a cheaper product within the same brand family if the contract only says "vinyl siding." Get the full name in writing.

2. House wrap type and coverage

A code-compliant synthetic house wrap — not loose building felt, which provides minimal protection during a multi-week installation. Specify the brand if possible: Tyvek HomeWrap or a comparable drainable wrap are two common specifications. The contract should also state coverage — full-wall house wrap, lapped shingle-style, is standard on a complete replacement. Anything that reads "as needed" or "per code minimum" is vague enough to be meaningless when you're trying to make a warranty claim.

3. Window and door flashing extent

Code minimum in most jurisdictions is flashing integrated at all exterior openings. That's the floor, not the recommendation. A well-specified contract states exactly how each opening will be flashed: sill pans, jamb flashing, and head flashing at every window and door, all lapped correctly with the weather-resistive barrier. If the house has a history of leaks around windows — or if the contractor recommends upgraded flashing detail — get the upgraded scope in writing so there's no ambiguity about what was installed if a leak develops.

4. Trim and flashing: new, not reused

Corner posts, J-channel, window and door surrounds, and kickout flashing should all be new on a full replacement. "Reuse existing trim where possible" is one of the most common cost-cutting phrases in residential siding contracts, and it's a warranty trap. Most manufacturer warranties on siding require new accessories and flashing to be valid. Get explicit language: "All trim — corner posts, J-channel, surrounds, and kickout flashing — to be removed and replaced with new material."

5. Starter strip and finish trim

Both are visible, both affect long-term performance, and both are frequently cut-cornered. The contract should confirm a continuous, level starter strip along the base of every wall — siding panels nailed straight to the sheathing without one is an outdated shortcut. Finish trim — frieze boards, soffit and fascia transitions — should be manufactured accessory pieces, not field-cut scraps. Site-improvised trim looks fine initially and fails early. This is a line item worth $300–$600 on most jobs, and it's worth the specificity.

6. Wall drainage scope

Wall drainage determines how long your siding system lasts, and it's the item most homeowners don't ask about. The contract should specify: whether the install is direct-applied or includes a rainscreen, the furring strip thickness and spacing if a rainscreen is used, whether a drainable house wrap is being substituted, and that weep holes at the bottom course will be left clear. If the existing drainage detail is being left as-is, that should be noted explicitly — along with any inspection finding about its adequacy.

7. Sheathing replacement protocol

Some sheathing replacement is almost always necessary on a re-side. The contract should state the per-sheet price — $50–$100 per sheet of OSB or plywood is a typical range, though it varies by market. More importantly, specify the protocol: homeowner notification before any replacement, photo documentation of damaged sheets before and after, and the homeowner's right to be present during any sheathing work. "Sheathing replaced as needed" with no per-sheet price is an open line item that can inflate your final bill significantly.

8. Tear-off vs. siding-over — explicit

A siding-over (installing new panels over existing cladding) is cheaper, faster, and almost always worse for the long-term performance of your walls. Some jurisdictions prohibit it; some manufacturer warranties require a full tear-off. The contract must say one of two things: "Complete tear-off to sheathing" or "Install over existing siding." If it says neither, assume the contractor will do whichever is cheapest on the day. If you're paying for a tear-off, get that in writing.

9. Debris removal and disposal

Who provides the dumpster, where it goes on your property, and what protection is used under it (plywood is standard). The contract should also specify ground protection — tarps or sheeting under work areas — and a final nail-sweep with a rolling magnet. Torn-off siding and old fasteners leave hundreds of nails in the yard. A magnetic sweep isn't optional if you have children, pets, or cars. Verify that disposal includes haul-away; some contractors charge separately for dump fees that weren't mentioned in the original quote.

10. Permit responsibility

Who pulls the permit, and whose name it's in. In many states, a licensed contractor is required to pull permits under their own license. If a contractor asks you to pull the permit as the homeowner, ask why — and understand that a permit in your name shifts liability to you if the work fails inspection or causes property damage. The contract should name the entity pulling the permit and the license number under which it's being pulled. If the contractor says the job doesn't require a permit, verify that independently with your local building department before proceeding.

11. Payment schedule

A reasonable payment structure for a residential siding job looks like this: 25–50% deposit at contract signing (covering materials), a mid-job draw when the tear-off is complete and materials are on-site, and final payment on completion and passed inspection. Avoid paying more than 50% before materials arrive on your property. Never pay in full upfront. Some states have statutory limits on advance payments for home improvement contracts — check your state's contractor licensing board website. If a contractor demands full payment before work begins, that's a meaningful signal.

12. Workmanship warranty AND manufacturer warranty registration

These are two separate things. The workmanship warranty covers the contractor's installation — leaks from improper flashing, panels blown off in wind, anything attributable to how the siding was installed rather than the materials themselves. Get the term (anywhere from 2 to 25 years, depending on the contractor and the program) and what it explicitly covers and excludes. The manufacturer warranty covers the siding itself — but most enhanced manufacturer warranties require registration by an authorized installer, within a specific window after installation. The contract should state who registers the warranty and in whose name it will be registered. Ask for a copy of the registration confirmation after the job is complete.

What else should be attached

Before you sign, the contractor should provide the following — not just mention them, but hand them to you in writing:

• Proof of general liability insurance: a current Certificate of Insurance naming you as the certificate holder, with coverage limits appropriate for a job of this size.
• Proof of workers' compensation coverage: a separate COI. If a worker is injured on your property and the contractor doesn't carry workers' comp, your homeowner's insurance may be the backstop.
• State contractor license number and the name the license is registered under. Verify it independently at your state's contractor licensing board — takes two minutes and occasionally surfaces expired licenses or active complaints.
• Signed lien waivers from any subcontractors before final payment. A subcontractor your contractor didn't pay can file a mechanic's lien against your property. A lien waiver from each sub at completion closes that exposure.

Red-flag contract language to negotiate out

These phrases appear in real siding contracts and all of them create problems:

• "Allowance for sheathing" with no per-sheet price. An allowance without a unit price is a blank check.
• "Additional work as needed" without a written change-order requirement. Any work outside the original scope should require a signed change order before it starts — not after.
• "Buyer to remove and replace [item]." Moving patio furniture is reasonable. Shutters, light fixtures, satellite dishes, or wall-mounted HVAC equipment are different — those require care and sometimes licensed trades, and the responsibility needs to be explicit.
• Mandatory arbitration clauses. Read the venue carefully. Some residential siding contracts specify arbitration in the contractor's home city or through a provider that favors contractors. You can often negotiate the arbitration venue or remove the clause entirely on a residential job — ask.

One more thing before you sign

The contract is the part of the job that protects you from the part of the job you can't see — the house wrap, the flashing, the sheathing under new siding. Twenty minutes going through this checklist before you sign saves six months of argument after the first storm.