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Replacing the windows in a house is one of the few home projects where the product arrives with independently certified numbers attached, so the decision can be made on evidence instead of adjectives. ENERGY STAR certifies windows against criteria that vary for each of its climate zones, and the ratings behind that certification are certified by the National Fenestration Rating Council. The program puts the payoff plainly: installing certified windows, doors and skylights can shrink energy bills by an average of up to 13 percent on heating and cooling costs nationwide compared with non-certified products, and replacing single-pane windows with certified ones lowers household energy bills by an average of up to 13 percent nationwide.

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The second fact worth knowing before anyone quotes is about the age of the house rather than the windows. Under the EPA's Renovation, Repair and Painting rule, firms cannot advertise or perform covered renovation work in homes built before 1978 without firm certification, and window replacement is always covered regardless of square footage. There is no small window job in a pre-1978 house.

Everything else follows from those two: find the zone your county sits in, order to the criteria for that zone, confirm the firm's certification if the house predates 1978, and settle in writing what happens when the crew opens a wall and finds something.

ENERGY STAR climate zones, NFRC ratings and what to ask for when you order

ENERGY STAR divides the country into climate zones and sets different certification criteria in each, because a window solving a heating problem in the far north is not solving the same problem as one in the desert Southwest. The program's finder identifies your zone when you select your state and county, and the advice at the point of sale is specific: when ordering in a showroom, ask for a product that is certified to meet the ENERGY STAR criteria for your climate zone.

The numbers on the label come from the NFRC, an independent nonprofit certification body for the energy performance of windows, doors and skylights. U-factor, rated between 0.20 and 1.20, describes how well the product keeps heat in, and the lower the number the better. Solar Heat Gain Coefficient runs from 0 to 1, with low numbers resisting solar heat and high numbers admitting it. Visible transmittance, also 0 to 1, rises with the amount of natural light let in. Air leakage measures how much air enters a room through the product, and certified products carry a rating of 0.3 or lower. Condensation resistance rises with the product's ability to resist condensation.

Orientation refines a choice that the zone alone cannot. In colder climates, ENERGY STAR describes the ideal window for a south-facing wall as one with a higher solar heat gain coefficient and a low U-factor to reduce heat loss, while east and west windows should have a low solar heat gain coefficient or be shaded. In warmer climates, where extra heat from the sun is unwanted, a low solar heat gain coefficient matters for windows facing south, east and west. Ratings for the exact product line quoted, not a brochure average, are what you compare.

When whole-house replacement is the right call rather than another repair

  • Several units have failed insulated glass seals at once, which usually means the whole run is the same age and the same vintage of sealant.
  • The frames themselves are rotted, racked or corroded, so no amount of hardware or weatherstripping will make them close and seal again.
  • Hardware for the line was discontinued, and each repair now depends on salvaged parts of unknown age.
  • The house still has single glazing with separate storm panels, and the storms are missing, broken or no longer sealing.
  • Sashes have been painted shut over decades, including in bedrooms, where an opening may be required to serve as an emergency escape and rescue opening under the code your jurisdiction adopted.
  • Siding, trim or a larger remodel is already planned, which is the one moment when full-frame work adds far less disruption than it would on its own.
  • Security or operation has become the real complaint, with locks that do not engage and sashes that cannot be opened by the people who live there.

Pre-1978 houses: the federal lead rule has no small-job exemption for windows

This is the single most checkable requirement on an American window job. The EPA's Renovation, Repair and Painting rule requires that anyone paid to perform work that disturbs painted surfaces in homes, childcare facilities and preschools built before 1978 be certified and their employees trained, and firms may not advertise or perform that work without firm certification. Where some activities fall under a minor repair and maintenance threshold, windows do not: window replacement and demolition of painted surfaces are always covered regardless of square footage. The EPA's own consumer guidance names the hazard directly, noting that common activities that disturb lead-based paint, including sanding, cutting and replacing windows, can create hazardous lead dust and chips.

Verifying the firm is straightforward. EPA firm certifications are good for five years, the agency runs a public firm-location search, and it tells consumers to look for the Lead Safe Certified Firm logo. Certification is administered by the EPA in most of the country, while Alabama, Delaware, Georgia, Iowa, Kansas, Massachusetts, Mississippi, North Carolina, Oklahoma, Oregon, Rhode Island, Utah, Vermont, Washington and Wisconsin run their own authorized programs, as does the Minnesota Chippewa Tribe at Bois Forte. If you are in one of those states, the certification you are checking is the state's.

The rule is aimed at paid work: the EPA states that it does not apply to homeowners doing these projects in their own pre-1978 homes, with exceptions for rental property, home-based childcare and buying and renovating homes for profit. That exemption is about who may legally do the work, not about whether the dust is dangerous, which is why the agency publishes lead-safe practices for do-it-yourselfers as well.

Local permits are a separate matter and still apply. Ask the building department whether replacement alone needs a permit where you live, and expect the answer to change the moment an opening is enlarged or a header is touched.

Planning a whole-house window replacement without living in a construction site

  • Site measurement comes before ordering, and made-to-order units are manufactured after the order is placed, so the calendar is set by the factory rather than by the crew.
  • Phasing by elevation or by floor keeps most of the house closed while work proceeds, which matters in weather extremes and in houses with pets or small children.
  • Interior prep is on you in most contracts: window treatments down, furniture pulled back, alarm sensors on the sashes identified in advance.
  • In a pre-1978 house, expect containment, careful debris handling and a thorough cleanup at the end of each working day rather than a single cleanup at the end of the project.
  • Openings are opened only as fast as they can be flashed, sealed and closed the same day, and any opening that must stay open overnight is secured and weathered deliberately.
  • Disposal of the old units and the old glass is scope: confirm who hauls it and whether it is included.
  • A closing walkthrough is done before the temporary labels come off, with every sash opened, closed and locked and the ratings on the labels checked against the contract.

Making two window quotes genuinely comparable

Window quotes are notoriously hard to line up because each one bundles a product decision, a labor decision and a scope decision into a single number. Pull them apart on paper. Write down, for each quote, the manufacturer and the exact product line, the certified ratings for that line in your climate zone, whether the existing frames stay or go, what happens to interior casing and exterior capping, who disposes of the old units, whether lead-safe certification applies and is held, who applies for any permit, and the term of the product warranty and the labor warranty separately.

Then look for the gaps rather than the totals. A quote that says nothing about rotted framing is not cheaper, it is silent, and silence becomes a change order once the wall is open. Agree in advance how framing repairs are priced and documented, and ask for photographs of anything discovered before it is covered up.

Beware of any comparison that rests on a discount rather than a specification. If two numbers differ sharply and the specifications do not explain why, something in the scope, the product line or the method is different, and it is worth finding out which before signing.

High-pressure window sales, in-home contracts and your right to cancel

Replacement windows are sold door to door and at kitchen tables more than most home improvements, and the pressure is usually applied to the clock: a price that expires tonight, a crew that happens to be in the neighborhood next week. A specification does not expire, and neither does a reputable company's interest in the job.

Federal law gives you a window to reconsider. The Federal Trade Commission's Cooling-Off Rule gives you three days to cancel certain sales made at your home, your workplace or a seller's temporary location, and your right to cancel for a full refund lasts until midnight of the third business day after the sale. The seller must give you a dated copy of your contract or receipt showing the seller's name and address and explaining your cancellation rights, along with two copies of a cancellation form. The rule has exceptions, including purchases made entirely online, by mail or by phone, so read what you are signing rather than relying on the rule as a safety net.

Use those days for the checks that matter: the state license or registration where your state has one, the EPA or state lead-safe certification if the house predates 1978, and the certified ratings of the exact product line for your climate zone.

Looking after new windows, and finding installers through LokalMatch

New windows need less maintenance than the ones they replaced, but the little of it they need is what most warranties quietly assume. Keep the weep holes at the sill clear so water that reaches the track can leave. Clean the tracks and lubricate the hardware on the schedule the manufacturer specifies. Do not paint over weatherstripping, balances or moving parts. Check the exterior sealant joints once a year and renew them before they crack all the way through. Keep the model and serial information with the warranty documents, because a replacement sash or balance years from now is ordered from that record.

LokalMatch handles only the introduction: you describe the replacement job once, with the number of openings, the age of the house and anything you already know about rot or access, and window installers covering your area contact you directly. Those pros pay for the requests they receive. LokalMatch does not replace windows, does not set prices, and does not vet, rank or recommend any company, so the certification checks and the comparison of certified ratings remain yours to make.

Window Replacement: frequently asked questions

How much will new windows actually save me?

It depends on what you are replacing and where you live. ENERGY STAR states that installing certified windows, doors and skylights can shrink energy bills by an average of up to 13 percent on heating and cooling costs nationwide compared with non-certified products, and that replacing single-pane windows with certified ones lowers household energy bills by an average of up to 13 percent nationwide. Replacing reasonably good double glazing is a different proposition from replacing single panes, and comfort, drafts and condensation often matter more to households than the bill does.

My house was built before 1978. What changes?

Who may legally do the work. The EPA's Renovation, Repair and Painting rule requires firms working on pre-1978 homes to be certified and their employees trained, and window replacement is always covered regardless of square footage, so there is no small-job exemption. EPA firm certifications last five years and there is a public firm-location search. Several states, including Massachusetts, North Carolina, Oregon, Washington and Wisconsin among others, run their own authorized programs, so check whichever applies where you live.

Which ratings should I insist on seeing?

The certified ratings for the exact product line being quoted, in your climate zone. ENERGY STAR criteria vary by climate zone and its finder identifies yours from your state and county, while the ratings themselves are certified by the NFRC: U-factor between 0.20 and 1.20 where lower keeps more heat in, solar heat gain coefficient from 0 to 1, visible transmittance from 0 to 1 where higher means more daylight, and an air leakage rating of 0.3 or lower on certified products.

Can I replace just the worst windows now and the rest later?

Yes, and phasing is common. Start with the units in the worst condition or on the most weather-exposed elevation. Two practical cautions: order the later phases from the same product line if matching matters to you, since lines are discontinued, and keep the documentation from the first phase so the second can be specified against it. The lead-safe requirements in a pre-1978 house apply to each phase separately, not just the first.

A salesperson is at my kitchen table with a price that expires tonight. What do I do?

Do not sign to hold a price. If you do sign, the FTC's Cooling-Off Rule gives you three days to cancel certain sales made at your home, with the right to cancel for a full refund lasting until midnight of the third business day after the sale, and the seller must give you a dated contract or receipt and two copies of a cancellation form. Use those days to check licensing, lead-safe certification and the certified ratings of the product line.

What should I keep when the job is finished?

The permit if one was issued, the final invoice, the product warranty and the labor warranty as separate documents, the manufacturer and product line with model or serial information, photographs taken while the openings were open, and the ratings from the temporary labels before they are removed. If the house is pre-1978, keep the firm's lead-safe certification details with the rest. That file is what a future repair, warranty claim or buyer's inspection is settled from.

Sources

  1. ENERGY STAR: residential windows, doors and skylights
  2. ENERGY STAR: key product criteria for residential windows, doors and skylights
  3. ENERGY STAR: windows, doors and skylights climate zone finder
  4. NFRC: understanding the energy performance label
  5. EPA: Lead Renovation, Repair and Painting Program
  6. EPA: RRP Program requirements for contractors
  7. EPA: RRP firm certification and EPA-authorized state programs
  8. EPA: RRP Program information for consumers
  9. FTC: buyer's remorse, the FTC's Cooling-Off Rule may help

Written by the LokalMatch editorial team. Last reviewed September 14, 2026. How we write and check our guides

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What affects the cost of window replacement

Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:

  • Number, size and style of windows or doors
  • Frame material and glass options
  • Full-frame replacement or insert
  • Repairs to rotted framing or sills
  • Interior and exterior trim and capping
  • Access, including upper floors

How to compare window installers before you hire

  • Look for an installer who measures on site and explains how the new window or door will be sealed and flashed.
  • Ask whether the quote is for a full-frame replacement or an insert, and why they recommend it.
  • Compare quotes on the same product type, glass options, installation method and interior and exterior trim.
  • Ask who handles warranty issues: the installer, the manufacturer or both.
  • For garage doors, choose a technician trained on springs and openers, since that work can be dangerous.

Questions to ask window installers before you hire

  • Will you replace the full frame or install an insert, and what's the difference for my home?
  • How will you insulate and seal around the new units?
  • Is interior and exterior trim included in the price?
  • What does the manufacturer's warranty cover, and what does your installation warranty cover?
  • How long will it take for the products to arrive once I order?
  • Will your own crew do the installation?

When to call a pro for window replacement

  • Drafts, condensation or fog between the panes
  • Windows or doors that stick, won't lock or let water in
  • A garage door that's off track or has a broken spring: don't try to force it, and call a garage door technician.

Window replacement permits and local rules

Some window replacement work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.

Permits and licensing

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