A homeowner's guide to window replacement in the Triangle

What replacement windows cost in Raleigh, Durham, Cary and Chapel Hill, when North Carolina requires a license or a permit, the state code rules a new window has to meet, and the lead paint rules for homes built before 1978. Every rule and price links to the page it came from.

What window replacement costs in the Triangle

The figures below come from Angi's local cost figures and from national cost guides. They are guide figures. The number of windows, their size, the frame material and the glass set the real price, so get written quotes for your own house.

Local figures

Angi's local range for a window replacement project is $2,289 to $9,621 in Raleigh and Cary, and $3,803 to $9,966 in Durham and Chapel Hill (Angi, Raleigh; Angi, Cary; Angi, Durham; Angi, Chapel Hill). Each pair of cities returns the same numbers, so treat them as two regional figures, not four local ones.

National guides

• Angi (updated October 15, 2026): a national average of $7,348 from 17,857 projects, with most homeowners paying $3,436 to $11,838 and single windows running $300 to $2,500, depending on the frame, the glass and how hard the installation is (Angi).
• HomeGuide (February 5, 2026): $450 to $1,500 per window on average, or $4,500 to $22,500 for 10 to 15 windows (HomeGuide).
• Fixr (updated January 21, 2026): about $800 per window, usually $450 to $1,200. Fixr adds that many installers give a discount per window when you replace several at once (Fixr).
• HomeAdvisor (updated June 17, 2026), by glass: double-pane windows cost $450 to $1,000 each installed, and triple-pane windows $500 to $2,000 each (HomeAdvisor).

By frame material

The table comes from HomeGuide (HomeGuide). Its own paragraph on vinyl gives a higher low end, $350 per window, so read the bottom of each range as optimistic (HomeGuide).

Licenses: who may replace windows in North Carolina

North Carolina requires a general contractor license only when a job costs $40,000 or more (G.S. 87-1; NC contractor board). Most window jobs come in below that. For a whole-house job at $40,000 or more, the license class that covers houses is the Residential classification, which covers "all construction and demolition activity pertaining to the construction of residential units" built to the state's residential code (NC contractor board, classes). You can look any licensee up on the board's public search (License search).

Lead-safe certification for homes built before 1978

If your house was built before 1978, a separate state certification applies whatever the price. North Carolina requires certification for paid renovation work that disturbs lead-based paint in housing built before 1978, and the state's Health Hazards Control Unit certifies the firms and individuals who do it (NC lead program). The firm you hire "must be a North Carolina certified renovation firm," and the state keeps a public database of certified firms you can check (NC lead FAQ; NC lead program).

The federal lead rule gives window replacement no small-job exemption. Its definition of minor repair, which covers up to 20 square feet of painted surface outside, applies only "where the work does not involve window replacement" (40 CFR 745.83). The EPA says about three-quarters of U.S. homes built before 1978 still have some lead paint, and that worn paint on surfaces that rub, such as window sills, makes hazardous dust (EPA).

Before work starts in a pre-1978 home, the firm must give you the EPA pamphlet "The Lead-Safe Certified Guide to Renovate Right" (NC lead FAQ). The rules do not bind you if you replace windows yourself in a home you live in, though the state recommends lead-safe work practices (NC lead FAQ).

Permits in Raleigh, Durham, Cary and Chapel Hill

The state rule

State law says no building permit is needed for work "costing forty thousand dollars ($40,000) or less" on a single-family home unless the work falls under one of its exceptions (G.S. 160D-1110). The first exception is work on load-bearing structures, but the same sentence carves windows back out: "no permit is required for replacement of windows, doors, exterior siding" (G.S. 160D-1110). So under state law, swapping a window into the same opening for $40,000 or less needs no permit. Making an opening wider usually means changing the header that carries the wall above it, which is load-bearing work, and that needs a permit.

Raleigh

Raleigh lists "siding, windows, doors" among the projects that "require a permit but do not require plans" (Raleigh, how to get a permit). Its residential permits page says work costing $40,000 or less can still need a permit when it involves load-bearing structures (Raleigh, residential permits). Neither page explains how the list fits with the state's carve-out for windows. In Raleigh, ask the City before you count on skipping a permit.

Durham

Durham's City-County Building & Safety Department says a building permit is "required for any project that includes load bearing work or any project exceeding $40K in market value" (Durham Building & Safety). The page does not mention windows.

Cary

Cary's list of work that needs no permit covers "non-structural cosmetic building elements" and roof coverings, and does not name windows (Cary, permits). Its page invites anyone who is unsure to ask (Cary, permits).

Chapel Hill

Chapel Hill's residential permits page says "any building, construction, alteration, remodeling work with structural components requires a building permit," and does not mention windows (Chapel Hill, permits). Ask the Town's permit staff by email, the route the page gives (Chapel Hill, permits).

Historic districts

A local historic designation adds its own approval, separate from the building permit. Raleigh requires a Certificate of Appropriateness from the Raleigh Historic Development Commission for homes in a historic district or designated as a landmark, and approval may be needed before the permit application (Raleigh, how to get a permit). Durham lists "Replacement of siding, doors, or windows" among changes that can need one, says a certificate "is required whether or not the change is visible from the street," and reviews minor applications within 10 business days (Durham COA). If your house is in a local district anywhere in the Triangle, ask the town's preservation staff before you order windows.

The short answer

For same-size replacement windows costing $40,000 or less, state law says no permit (G.S. 160D-1110). Raleigh lists windows as permit work anyway (Raleigh, how to get a permit), and Durham, Cary and Chapel Hill do not name them (Durham Building & Safety; Cary, permits; Chapel Hill, permits). Bigger openings need a permit everywhere. North Carolina's Attorney General warns that a builder who asks you to take out the permits yourself may not be licensed (NC Attorney General).

State code rules for replacement windows

The 2018 North Carolina codes are the ones in effect (State Fire Marshal, codes). These rules apply to replacement windows even when no permit is pulled, because the state's no-permit rule covers only work done to the code (G.S. 160D-1110).

Energy ratings

Durham, Orange and Wake counties are all in climate zone 4A (NC energy code). In zone 4, a window may have a U-factor of no more than 0.35 and a solar heat gain coefficient (SHGC) of no more than 0.30 (NC energy code). When a whole window is replaced, frame, sash and glass, the new unit has to meet those numbers (NC energy code). There is one exception: if you replace fewer than half of the windows, the new ones may be "like or better" units that match the existing windows (NC energy code). The code requires the U-factor to be tested by an independent laboratory and labeled by the manufacturer (NC energy code), so ask for both numbers in the quote.

Bedroom escape windows

A bedroom window that serves as the emergency escape opening can be replaced without meeting today's sill-height and size rules, on two conditions. The new window must be "the manufacturer's largest standard size window that will fit within the existing frame or existing rough opening," and it must be the same operating style, or a style that opens at least as wide (NC Residential Code, ch. 3). Swapping a double-hung window for a smaller-opening style in a bedroom can break that rule.

Safety glass

Glass in hazardous locations has to pass an impact test (NC Residential Code, ch. 3). The code's list includes glass within 24 inches of either side of a door, in the plane of the door, when its bottom edge is less than 60 inches above the floor; a single pane larger than 9 square feet with its bottom edge less than 18 inches above the floor and a walking surface within 36 inches; and glass facing a bathtub or shower with its bottom edge less than 60 inches above the floor (NC Residential Code, ch. 3). Ask whether any of your windows fall in those places.

Fall protection for low sills

If an opening window's sill is less than 24 inches above the floor inside and more than 72 inches above the ground outside, the code requires one of three fixes: an opening that a 4-inch ball cannot pass through, a fall prevention device meeting ASTM F2090, or an opening control device (NC Residential Code, ch. 3). This comes up most with upstairs windows.

Flashing

The code says window openings are flashed following "the fenestration manufacturer's installation and flashing instructions," and where no instructions are given, "pan flashing shall be installed at the sill" (NC Residential Code, ch. 7). Ask the installer which method they will use on your house.

The federal tax credit has ended

The federal Energy Efficient Home Improvement Credit covered "improvements made through December 31, 2025" (IRS). Windows had to meet ENERGY STAR Most Efficient requirements, the credit for windows was capped at $600, and installation labor did not count (IRS). Windows installed in 2026 do not qualify, so a sales pitch built on that credit is out of date.

Hiring: questions to ask and red flags

• Was the house built before 1978? If so, ask for the firm's North Carolina renovation certification and check it in the state's database (NC lead program; NC lead FAQ).
• Ask for the U-factor and SHGC of each window, and compare them with the zone 4 limits of 0.35 and 0.30 (NC energy code).
• Ask how the windows will be flashed, and whether the installer follows the window maker's instructions (NC Residential Code, ch. 7).
• Ask who handles any permit or historic-district approval. A builder who wants you to pull the permit yourself may not be licensed (NC Attorney General).
• A demand for everything up front or cash only is a warning sign (FTC).
• If you sign at home, the FTC's Cooling-Off Rule gives you until midnight of the third business day to cancel many sales, even when you invited the salesperson (FTC Cooling-Off Rule). The contract should include a written statement of that right (FTC).