Most people start thinking about new siding for a cosmetic reason: it is faded, a panel has cracked, or the color has dated the house. The better reason to look closely is what siding protects. It is the outer layer of a wall that keeps rain away from the sheathing and framing, and by the time it looks tired it may already be letting water in.

Replacing it is a big exterior job, so before you collect quotes it helps to know three things: whether you actually need it, what a complete quote covers, and the one upgrade that is far cheaper during re-siding than at any other time.

Key takeaways

  • Look for soft spots, swelling, gaps at trim and stains inside before deciding siding is only cosmetic.
  • In a home built before 1978, a paid contractor who disturbs painted surfaces must be EPA lead-safe certified.
  • The Department of Energy calls re-siding the time to add continuous exterior insulation, often paying back in 5 to 10 years.
  • Compare quotes on the same items: tear-off, house wrap, trim, flashing and an allowance for rotten sheathing.

A ten-minute walk around the house

Go around the outside on a dry day with a screwdriver. Press it gently into any siding or trim that looks swollen or stained. Wood that gives easily is wet or rotting, and that damage usually continues behind the siding.

  • Check the bottom courses and the area under windows, where water collects.
  • Look for gaps where siding meets trim, and for caulk that has split.
  • Vinyl that is cracked, warped near a grill or loose in the wind can often be patched one panel at a time.
  • Inside, look for peeling paint or stains on exterior walls, which can point to water getting past the siding.

If the problems are limited to a few panels and the wall behind is dry, a repair is usually the sensible call. Widespread soft spots, recurring leaks or siding at the end of its life are when full replacement starts to make sense.

Older house? The lead-paint rule applies

If your home was built before 1978, the EPA's Renovation, Repair and Painting rule requires anyone paid to do work that disturbs painted surfaces to be certified in lead-safe work practices, and that includes one-person firms.[1] Tearing off painted wood siding or trim falls squarely in that category. Ask for the firm's certification before you sign, and expect a certified crew to contain the work area and clean up more carefully, which is part of why their price may be higher.

Homeowners working on their own pre-1978 house are generally not covered by the rule, although it does apply if you rent out part of the home or run a childcare business there.[1]

The upgrade to do while the walls are open

Once the old siding is off, the outside of your walls is exposed for the first time since the house was built. The Department of Energy points out that adding continuous exterior insulation at this stage, at least 1 inch thick and taped to stop air leaks, is only incrementally more expensive than the siding itself, and the payback is often between 5 and 10 years.[2] The same layer can cover the rim joists, a common air-leak spot, and DOE notes that the comfort and noise improvements are noticeable straight away.[2]

Ask about the tax credit

DOE says insulation and air sealing may qualify for a federal tax credit when the work meets the 2021 International Energy Conservation Code.[2] Ask your contractor for product documentation so you can check eligibility with a tax professional.

What a complete quote includes

HomeGuide's national figures put installed siding at about $4 to $13 per square foot, with removal of the old siding extra.[3] The wide range comes from material choice and from what each contractor decides to include. To compare quotes fairly, ask each one to list:

  • the product line and color, and the measured wall area
  • tear-off and disposal of the old siding
  • house wrap or weather barrier, and any exterior insulation
  • flashing at windows, doors and the roof line
  • trim, soffit and fascia, and whether they are replaced or reused
  • a per-sheet price for replacing rotten sheathing if they find it

That last item is where budgets most often grow. Agreeing the price in advance means a surprise behind the old siding does not become a negotiation mid-job. Our guide to comparing builder bids has a worksheet that works just as well for exterior projects.

Picking a material you will still like in 20 years

The material sets the price, but it also sets the chores for the next few decades, and that second part is easy to forget in a showroom. A rough way to think about the common choices:

  • Vinyl never needs painting and is the cheapest to install. The trade-off is that the color is permanent, panels can crack if something hits them in cold weather, and they can warp near a grill or a reflective window.
  • Fiber cement holds paint well and won’t rot, but it is heavy, slow to cut and needs repainting eventually. Installers cutting it should control the dust.
  • Engineered wood looks like wood and is lighter than fiber cement. Follow the maker’s rules on clearances and sealing cut ends closely, because they are what keeps the warranty valid.
  • Real wood suits older houses and can be repaired board by board, but it needs paint or stain on a schedule, forever.

If you plan to sell within a few years, look at what the neighboring houses have. A material that fits the street usually serves resale better than the most expensive option.

Living through the job

Re-siding is loud and messy, and most of the mess lands in your yard. A little preparation saves arguments later:

  • Move cars, grills and patio furniture well away from the walls.
  • Cut back shrubs and ask how the crew will protect plants along the foundation.
  • Take pictures off interior walls. Hammering on the outside can shake them loose.
  • Agree where the dumpster goes, and ask for a magnetic sweep of the lawn and driveway at the end of each day. Old siding nails find tires and bare feet.

Weather and the condition of the sheathing are what stretch schedules. If the crew finds rot, they should show it to you before covering it up, along with the per-sheet price you agreed in the quote.

The walk-around before the final payment

Do one last lap before you pay the balance, ideally with the project lead. Look above every window and door for flashing, and check that there is a kick-out flashing where a roof edge meets a wall, because that spot sends water straight down the siding if it is missing. Siding should stop short of the ground and of roof surfaces rather than sitting in dirt or shingles. Make sure every vent, light fixture and hose bib has a proper mounting block instead of a ragged cut.

Finally, register the product warranty if the manufacturer requires it, keep the installer’s workmanship warranty with your house papers, and ask for a box of leftover pieces. Matching a discontinued color after a storm can be impossible.

Building new instead?

The calculator prices siding inside the exterior finishes stage, from NAHB averages or your own quote.

Open the calculator

Frequently asked questions

How do I know if my siding needs replacing or just repairing?

Probe swollen or stained areas with a screwdriver. If damage is limited to a few panels and the wall behind is dry, repair is usually enough. Widespread rot, recurring leaks or siding at the end of its life point to replacement.

Does a siding contractor need lead certification?

If the home was built before 1978 and the work disturbs painted surfaces, the EPA requires paid contractors to be certified in lead-safe work practices.

Should I add insulation when replacing siding?

The Department of Energy recommends considering continuous exterior insulation during re-siding. It says the extra cost over the siding is small and the payback is often 5 to 10 years.

How much does it cost to replace siding?

HomeGuide reports about $4 to $13 per square foot installed, depending mostly on the material, with removal of the old siding priced separately.

Can new siding go over the old siding?

Some installers offer it, but covering the old siding means nobody sees the sheathing underneath, and many manufacturers set strict rules for it. Tearing off is usually the safer choice when you suspect water damage.

What should I check before making the final payment?

Flashing above windows and doors, kick-out flashing where roofs meet walls, clearance from the ground and roof, neat mounting blocks around fixtures, a clean yard, and the warranty paperwork.

Sources

  1. US Environmental Protection Agency, "Lead Renovation, Repair and Painting Program" Verified
  2. US Department of Energy, "Energy-Efficient Home Improvement Credit Insulation and Air-Sealing Essentials" Verified
  3. HomeGuide, "How much does house siding cost to install or replace?", October 29, 2025 Verified

Figures last checked October 21, 2026. National averages are a planning guide, not a quote. See our editorial policy and data sources.