Cost to Replace Windows in a 1,500 sqft LA Home (2026)

A 1,500 sqft single-family home is the median LA property. It's the post-war Valley ranch, the Eastside bungalow, the Westside infill — the houses that make up most of our calendar. The cost question for this size house has a real answer, but it depends on three things: how many windows you actually have (count varies from 8 to 12 even at the same square footage), what material you spec, and whether your installer can do retrofit or has to go full-frame.

We pulled three jobs from our 2025 calendar that match this footprint exactly — a Sherman Oaks ranch, a Highland Park bungalow, and a Santa Monica contemporary — and walked them forward to 2026 pricing with our current Milgard, Marvin, and Pella catalogs. Every number below is what we'd quote those exact houses today, all-in: windows, labor, permit, Title 24 documentation, disposal, sales tax. Change orders for tear-out rot are called out separately because they're not predictable until we open the wall.

If you're shopping quotes, this guide gives you three reference points. If yours is materially different from all three, the difference is almost always one of: window count, full-frame vs retrofit ratio, or jurisdiction (Beverly Hills, Manhattan Beach, Pasadena, and Santa Monica run their own building departments and add 15–30%).

Builders don't put windows on a per-square-foot ratio — they put them on a per-room-and-elevation ratio. A 1,500 sqft tract ranch from the 1950s usually has 9–11 openings. A 1925 bungalow of the same footprint runs 8–10 because rooms are larger and exterior walls were designed for cross-ventilation, not view glass. A 1980s-and-newer home often pushes 11–13 because builders added view-walls and clerestories.

We count three things during the walk: standard openings (the bedrooms and bathrooms, usually 2.5' × 4' to 3' × 5'), oversized openings (living-room and kitchen sliders or picture units, 5'+ wide), and specialty units (arched, octagonal, transoms, tempered-required). Pricing is per opening, but oversized and specialty add 30–80% to the per-window number. The headline ranges in this guide assume an average mix — about 75% standard, 20% oversized, 5% specialty.

Marco walks every job before we quote. The count he writes on the clipboard is the count we quote — no surprises after contract.

1,520 sqft single-story ranch south of Ventura Blvd, original aluminum sliders failing on the south and west elevations, conducting summer heat into the house at a measurable 8–11° differential vs the north rooms. Homeowner wanted to standardize on one material, one color, planning a 12-year hold before downsizing.

Scope: 10 openings — 6 standard bedroom/bath sliders (2.5' × 4'), 3 oversized living-area units (5' × 4' picture plus 3' × 4' flankers), 1 kitchen-greenhouse window. Retrofit on 7, full-frame on 3 (the kitchen window had rough-opening rot from a 1990s irrigation leak; the two south-facing living-room units needed seismic anchor remediation per CRC R613.4).

Quote: 10 Milgard Tuscany vinyl in beige — $8,400 windows + install. Stucco patching on 3 full-frame openings — $840. Interior trim refresh on 6 (where casing depth changed) — $720. Title 24 + LADBS permit — $364. Disposal of old aluminum — $150. Total: $10,474 ($1,047 per window installed average).

Day count: Permit pulled in 9 business days through LADBS online portal (Title 24 zone 9, no historic overlay, no HOA). Install completed in 2 days — day 1 retrofit on 7, day 2 full-frame on 3. Inspection passed on first call, day 16 from contract. Total permit-to-finish: 19 days.

What changes the number: If this homeowner had specified Marvin Elevate fiberglass instead, the same scope would have run $17,200 ($1,720/window). If we'd found additional rot on tear-out — common on irrigation-adjacent walls — the change order band is $200–$1,500 per affected opening. If the house had been in Burbank instead of Sherman Oaks, subtract about 4% (faster permit, simpler inspection).

1,540 sqft two-story contemporary north of Wilshire, original aluminum-frame double-pane units with failing seals (visible inter-pane fogging on 8 of 12). Salt-air corrosion on the west elevation hardware. Homeowner wanted slim sightlines to preserve the architecture's intent and was willing to pay for fiberglass over vinyl because Santa Monica's resale market rewards spec.

Scope: 12 openings — 7 standard bedroom/bath (3' × 4'), 3 oversized west-facing view units (6' × 5' picture), 2 stairwell tempered-required units (CRC requires tempered within 18" of walking surface). Retrofit on 9 (the original aluminum block-frames were structurally sound and dimensionally compatible), full-frame on 3 (the west-facing units had salt-corroded anchors that required strip-out and re-flashing).

Quote: 12 Pella Impervia fiberglass in black — $19,200 windows + install. Tempered upgrade on 2 stairwell units — $180. Stucco patching on 3 full-frame west-facing — $920. Interior casing refresh on 5 — $640. Santa Monica building department permit (runs ~30% higher than LADBS) + Title 24 — $640. Disposal — $200. Total: $21,780 ($1,815 per window installed average).

Day count: Santa Monica building department permit took 14 business days (their plan-check is more rigorous than LADBS but inspection scheduling is faster — net wash on calendar). Install ran 3 days. Final inspection day 21 from contract. Total permit-to-finish: 22 days.

What changes the number: Vinyl instead of fiberglass would have run $13,440 — but on Santa Monica resale, that's a documented downgrade. The west-facing salt exposure also makes vinyl a 12–15 year window vs fiberglass at 30+. If this homeowner had been one block closer to the coast (Tier-3 wind/salt zone), we would have spec'd laminated glass on the west elevation, adding about $1,200.

Sherman Oaks ranch (LADBS, no overlay): 7–10 business days through the LADBS online portal. Title 24 docs filed concurrently. This is the fastest path in the LA market — straightforward residential, no historic review, no coastal review.

Highland Park bungalow (LADBS + HPOZ): 25–35 business days. The HPOZ application (Highland Park-Garvanza, in this case) is the long pole — board reviews are monthly and require photo documentation of the existing sash profile and the proposed match. We've done enough of these that our applications typically pass on the first review; first-time applicants often get sent back for revisions, adding another 30 days.

Santa Monica contemporary (City of Santa Monica BD): 12–18 business days. Santa Monica runs its own building department with stricter plan check than LADBS but faster inspection scheduling. They also require a separate energy compliance review for any project replacing more than 50% of glazing area — automatic on a whole-home job. No coastal commission review unless you're west of Ocean Ave.

Other jurisdictions in our footprint: Pasadena 14–21 days (similar to Santa Monica), Beverly Hills 18–28 days (background-check vendor list adds time), Manhattan Beach 14–21 days (coastal commission notification on west-of-Highland projects), Burbank/Glendale 5–9 days (faster than LADBS).

If your home is a post-war Valley ranch with original aluminum, the Sherman Oaks number is your starting point. If it's a pre-1940 character home anywhere from Highland Park to West Adams to Santa Monica's north-of-Montana craftsmans, the Highland Park number anchors you. If it's an 80s-or-newer contemporary anywhere on the Westside or coastal South Bay, the Santa Monica number is closest.

The fastest way to get from a range to a number is to have us walk the house. Marco does the walk himself on 1,500 sqft jobs — 60 to 90 minutes, no obligation, you get an itemized written quote within 48 hours. We'll tell you which openings make sense as retrofit and which need full-frame, what the Title 24 spec is for your zone, and what the permit timeline looks like in your jurisdiction. The quote locks for 30 days at the price we write.

If you're shopping multiple installers (you should be), ask each one to quote against the same scope: same window count, same retrofit/full-frame split, same material and series. Apples-to-apples on those three variables eliminates 80% of the confusion in window quotes. A quote that comes in 25% under the others is almost always missing the permit, the Title 24 filing, or the stucco repair — not finding a price advantage.