How often to check siding, windows and decks, and when to schedule exterior work

Updated November 10, 2026 · KeystoneProGuide editorial team

How often should siding, windows and decks be replaced?

None of the public sources gives a schedule, and that is worth knowing before anyone tells you your windows or siding are "due". Replacement depends on condition, not on age. What the sources do give is advice on how often to look, what to keep up, and when timing genuinely matters. The cost-survey pages publish lifespans for materials, but those are commercial estimates, and this directory does not repeat them as fact.

How often should you look?

On a routine, rather than when something fails. Utah State University Extension's home maintenance checklist builds exterior checks into a regular schedule: inspecting window caulk for cracks, gaps or peeling, touching up exterior paint before moisture gets into the wood, and trimming back plants that sit against the siding. It also passes on a rule of thumb from a Consumer Financial Protection Bureau worksheet: budget roughly 1% of your home's value a year for maintenance and repair. On that rule, a $400,000 house would set aside about $4,000 a year for everything, not just the exterior.

For historic windows, the National Park Service says regular maintenance is what lets them survive longer and work better than a replacement, and that a careful inspection, window by window, is the basis for deciding between repair and replacement. Looking at each sash, its paint, its putty and its weatherstripping before any decision is how that advice works in practice.

When should you check the deck?

Before the season you use it. The North American Deck and Railing Association, the industry's trade group, promotes May as Deck Safety Month and publishes a 10-point consumer checklist for a visual inspection, covering corroding fasteners, decaying materials, loose railings and lighting. It says the checklist is no substitute for a professional inspection. The association's estimate that 30 million U.S. decks have exceeded their useful life is its own figure, but the timing advice is simple: walk the deck, the stairs and the railings before the first party, not after.

For an older deck built from wood treated with chromated arsenicals, which manufacturers stopped making for homeowner use in December 2003, the EPA says applying a penetrating coating, such as an oil- or water-based stain, on a regular basis may reduce leaching of the chemicals. It does not say how often; the stain maker's instructions are the place to look for an interval.

When is a repair urgent?

When water is getting in. The EPA's guidance on moisture says that if wet materials are dried within 24 to 48 hours, in most cases mold will not grow, and that leaks should be fixed as soon as possible. A failed window seal letting rain into the wall, or a door threshold that floods in a storm, is a job for this week.

Pennsylvania's rules allow for that. The state regulation lets an emergency repair or replacement go ahead without a permit first, provided the permit application follows within 3 business days. The home improvement law excludes genuine emergency work done under the state's Consumer Protection Law from its definition of a home improvement, but only where the contractor gets a signed emergency waiver on the state's form. A contractor who calls ordinary replacement an emergency to skip the paperwork is misusing that exception.

When is the best time of year to schedule work?

No official source names a season for siding or windows. Two practical facts bear on it. HomeAdvisor, a commercial cost site, says some deck builders offer discounts of up to 20% in the off-season, in winter or around holidays, and charge more in busy summer months; treat that as the publisher's pricing observation. And permits take time. In Philadelphia the city says most applications without plans are processed within 5 business days; suburban municipalities set their own pace, so ask your township or borough how long a deck or window permit usually takes before you set a start date.

One former timing reason no longer applies. The federal energy efficient home improvement credit, which paid 30% of the cost of qualifying windows, doors and skylights up to set caps, covered improvements made through December 31, 2025, according to the IRS. A seller who urges you to buy before a tax deadline should be able to point to a current IRS page that says so.

How much time should you leave between signing and starting?

At least three business days. Pennsylvania's home improvement law gives you that long to rescind any contract over $500, wherever it was signed, and the Attorney General reported in May 2026 that the Supreme Court held you can cancel by any means the contractor actually receives. The contract must give approximate start and completion dates; a start date inside those three days, with materials already arriving, leaves you little room to change your mind.

Where next?

If a yearly check turns up a problem, warning signs helps sort the serious from the cosmetic, and what to expect walks through a job from contract to inspection. Listed businesses are on the exterior remodeling directory page.

Sources

1. Home Maintenance Checklist, Utah State University Extension
2. NADRA.org Urges Homeowners to Prioritize Deck Safety with Check Your Deck Campaign, North American Deck and Railing Association (NADRA)
3. Chromated Arsenicals (CCA), U.S. Environmental Protection Agency
4. Weatherization of Historic Buildings: Repair and Upgrade Windows and Doors, National Park Service
5. A Brief Guide to Mold, Moisture and Your Home, U.S. Environmental Protection Agency
6. 34 Pa. Code 403.62. Permit requirements and exemptions., Commonwealth of Pennsylvania (Pennsylvania Code)
7. Get permits without plans (EZ permits), City of Philadelphia
8. How Much Does It Cost to Build a Deck in 2025?, HomeAdvisor
9. Energy Efficient Home Improvement Credit, Internal Revenue Service
10. 2008 Act 132 (Home Improvement Consumer Protection Act), Pennsylvania General Assembly
11. PA Supreme Court Upholds Consumer Right-to-Cancel Home Improvement Contracts Within Three Days Regardless of Medium, Pennsylvania Office of Attorney General