Storm Window Installation Cost in 2026

By HomeCost Guide · Updated October 2026 · Average covers a standard aluminum exterior storm window, measured and installed, per window.

Storm window installation costs $150 to $600 per window in 2026, with most homeowners paying around $350 per window for a quality aluminum exterior unit professionally installed. Storm windows are the budget alternative to full window replacement: instead of tearing out the old window, you add a second layer of protection — an extra pane (or two) mounted inside or outside the existing window — creating an insulating air gap that cuts drafts and heat loss dramatically. They are the classic solution for old houses with original wood windows worth preserving, where replacement would destroy historic character or cost five times as much. The price depends on which of the two worlds you choose: interior or exterior mounting, and how the panels operate. This guide prices both, plus the track systems that separate a storm window you will actually use from one that lives in the garage.

1. Storm Window Installation Cost in 2026 cost breakdown

Angi's comparison data puts aluminum storm windows at $90–$275 per window for the unit, while HomeYou's installed figures center on $270–$606 per window all-in. The gap is labor and measurement — storm windows must be measured to the sixteenth of an inch, and that precision is what you pay the installer for.

Where the money goes: labor vs materials vs fees

• Labor$50–$150 per windowPrecise measuring, fitting, and fastening. Exterior second-story work adds ladder time; interior panels are the quickest install.
• Materials$90–$400 per windowThe storm unit itself. Aluminum two-track at the bottom; custom wood and Low-E glass at the top.
• Permits & fees$0Storm windows mount to existing frames without structural change — no permit required.

Sources: Angi, HomeYou, HomeYou. Figures are national averages compiled from published industry data; your price will vary by home and location.

2. Signs storm windows are your answer

Signs storm windows are your answer

• Original wood windows with character worth saving, but drafts that make rooms uncomfortable.
• Single-pane windows throughout the house and a replacement quote that made you flinch.
• A historic district or landmark status that restricts or forbids window replacement.
• Winter condensation and ice forming on the inside of single-pane glass.
• Street noise bleeding through thin original windows — the added air gap noticeably quiets it.
• Old aluminum triple-tracks from the 1980s with bent frames, torn screens, and missing hardware.

3. How storm window installation works

How storm window installation works

1. Opening measurement. Each opening is measured in multiple places to the sixteenth of an inch — old houses are never square, and storm windows are custom-fit to the smallest dimension. This precision is the core of the job.
2. Type and track selection. You choose interior vs. exterior, track configuration, frame material, and glass options (clear, Low-E, tempered where required). Units are ordered to the measurements, typically two to four weeks out.
3. Preparation of the existing window. The primary window is cleaned, reglazed or repaired where needed, and its exterior casing is checked for rot. Storm windows trap moisture against a failing frame — fixing the base window first is essential.
4. Mounting. Exterior storms are screwed to the blind stop or casing with the frame bedded in sealant; the top and sides are caulked while the bottom is left with weep gaps for drainage. Interior panels press or magnet into the window jamb.
5. Adjustment and operation check. Sliding panels are tested in every track, screens are checked for fit, locks and latches are verified, and the homeowner is shown how to swap glass and screen panels seasonally on triple-track units.

4. What affects the cost

Interior vs. exterior mounting

Exterior storms are the traditional choice: they protect the primary window from weather, and triple-track versions give you operable glass plus a screen. Interior storms mount inside the house — nearly invisible, excellent at stopping drafts and noise, and installable by the homeowner — but they do nothing to protect the exterior of the old window. Interior panels run $100–$300 installed; exterior units $150–$500. For historic preservation, interiors are often preferred since the exterior appearance never changes.

Track systems: two-track vs. triple-track

Two-track storms hold one glass panel and one screen in two channels — simple, cheaper ($150–$400), and fine for most windows. Triple-track adds a third channel holding two glass panels plus the screen, so you get ventilation with the screen in place and full glass coverage in winter without storing panels. The triple-track premium ($50–$150 more per window) is worth it on windows you open regularly; on fixed or rarely opened windows, two-track saves money with no real penalty.

Frame material

Aluminum is the workhorse — affordable ($90–$275 per unit), durable, and available in colors to match trim. Wood storms ($300–$600 installed) suit historic homes where aluminum would be an anachronism, but they need painting and weigh more. Vinyl storms exist at the budget end but can warp in heat. For most houses, painted aluminum is the set-and-forget answer.

Low-E glass upgrade

Standard storm glass is clear single-pane; adding a Low-E coating ($50–$150 per window premium) reflects radiant heat and measurably improves the assembly's U-factor — studies show Low-E storms can cut heating costs 10–20% on single-pane windows. On north-facing or particularly drafty windows, the upgrade pays for itself; on mild exposures, clear glass is fine.

Custom sizing and odd shapes

Storm windows are made to measure as standard practice, so rectangular odd sizes cost little extra. Arched, round, or unusually large openings jump to custom fabrication at 50–100% premiums. Measure every opening individually — assuming 'they're all the same' in an old house guarantees ill-fitting units and reorder delays.

Condition of the primary window

A storm window over a rotted, unsealed primary window traps moisture and accelerates decay — installers worth hiring will flag frame repairs ($100–$300) before mounting storms. Budget for reglazing, rot repair, and fresh exterior paint on the base windows as part of the project, not as an afterthought.

Second-story and access costs

Ground-floor exterior storms are quick ladder-free work in many houses. Second-story installations need extension ladders or scaffolding, adding $25–$75 per window in labor. Interior storms dodge this entirely — one reason upper floors of old houses often get interior panels while the ground floor gets exterior triple-tracks.

Screens and seasonal operation

Triple-track screens are included; two-track units include one screen. Replacement screen mesh, pet-resistant screening, and solar screen upgrades run $25–$75 per window. Factor in your own tolerance for the twice-yearly panel swap — if you will never do it, pay for triple-track so the screen lives in the window year-round.

Quantity and whole-house pricing

Measuring and ordering is per-opening work, but installation mobilizes once — a full house of 12 storms typically prices 15–25% less per window than doing three. If the plan is whole-house eventually, doing it once also guarantees matching frame color and glass across all units.

Storm windows vs. replacement math

A quality storm at $350 vs. a replacement window at $700–$1,000 is the core value proposition — and on a historic wood window, the storm preserves original fabric that replacement destroys. But storms do not fix failed seals, rotted frames, or inoperable sashes; they upgrade performance of windows that are fundamentally sound. Price both paths honestly before deciding.

5. Saving money & hiring right

Questions to ask your contractor

• Are you recommending interior or exterior for my windows, and why?
• Two-track or triple-track — which suits how I actually use these windows?
• What is the condition of my primary windows, and what repairs do they need first?
• Is Low-E glass worth it on my exposures, and what is the exact upcharge?
• How are the bottom weep gaps handled so moisture drains instead of trapping?
• What is the warranty on the frame, glass, and installation labor?

6. How costs vary by state

Storm window economics are strongest where winters are harsh and old housing stock is deep. Labor for precise measuring and fitting varies by market as usual.

7. Frequently asked questions