Window & Door Replacement Los Angeles — Title 24 Envelope, NFRC-Rated, Lead-Safe
Window and door replacement in LA is two jobs stacked on top of each other: the energy-code job and the noise/comfort job. The energy-code job is non-negotiable — 2025 California Title 24 Part 6 requires every new or replacement window in a residential remodel to hit a U-factor of 0.30 or lower (heat transfer) and a Solar Heat Gain Coefficient (SHGC) of 0.23 or lower (sunlight heat blocking), with HERS verification for full replacements. The comfort job is what makes the difference between a $24K full-home replacement that feels like a $24K replacement and one that feels like a $48K replacement: NFRC-rated dual-pane low-E argon-filled glass, foam-sealed installation (not just caulk-and-shim), insulated frames that don't sweat in February, and — if you live near LAX, in Westchester, El Segundo, Hawthorne, Inglewood, or the southern Westside — acoustic glass with STC ratings of 35-40 that turn a 90-decibel jet flyover into 65-70 decibels inside. The third layer most LA contractors miss: EPA Renovation, Repair, and Painting (RRP) lead-safe certification. Any window replacement on a house built before 1978 requires lead-paint testing and EPA-RRP containment ($600-$1,400 added) by an EPA-certified firm. We're certified. Most LA window-replacement outfits aren't. NPLD: CSLB GC #1105249, architectural since 2016, GC since 2023, 200+ LA County builds. Milgard, Andersen, Marvin, Pella, Jeld-Wen, Sierra Pacific, and Western Window Systems — we install all of them. Hablamos español.
What window and door replacement actually costs in LA in 2026
Per-window costs vary by tier, frame material, and glass spec. Standard tier ($850-$1,400 per window installed). Vinyl frame, dual-pane low-E argon-filled glass, NFRC U-factor 0.28-0.30, SHGC 0.21-0.23, standard sizes (24-48 inches wide, 36-60 inches tall), white or beige frame color. Milgard Trinsic, Jeld-Wen Builders Vinyl, or Pella 250 Series. Mid-tier ($1,400-$2,400 per window installed). Composite or fiberglass frame, dual-pane low-E argon glass, exterior color options, slightly higher SHGC tunability for LA's sun exposure. Milgard Tuscany or Style Line, Andersen 100 Series, Pella Impervia. Premium ($2,400-$5,500 per window installed). Wood-clad or aluminum-clad frame, triple-pane option, custom sizes, multi-slide or bi-fold patio doors, full-color frame, integrated screens. Marvin Elevate, Andersen 400 Series, Sierra Pacific H3, Western Window Systems multi-slide. Luxury impact + acoustic ($5,500-$11,000 per window). Triple-pane laminated acoustic glass with STC 38-42 ratings, impact-rated frames for coastal exposure (PCH-adjacent, Malibu, Manhattan Beach front-row), custom millwork integration. Andersen E-Series, Marvin Signature, Western Window Systems Series 7600. Full-home replacement (15-25 windows typical): $24K-$95K for standard-to-premium tier, $95K-$280K for luxury/impact/acoustic on a estate-grade home. All bids fixed. EPA-RRP containment, Title 24 envelope verification, and HERS rater fee (if HERS required) line-itemed at cost. Most window-only replacement jobs do not trigger HERS — only when combined with whole-house envelope work do you need it.
Title 24 + NFRC — what every LA window has to do in 2026
California Title 24 Part 6 (2025 cycle) sets two non-negotiable performance numbers for residential windows: U-factor 0.30 max (heat transfer from inside to outside in winter, lower = better insulation), and Solar Heat Gain Coefficient (SHGC) 0.23 max (how much solar heat the glass lets through in summer, lower = better in LA's south and west exposures). Every window we install ships with an NFRC (National Fenestration Rating Council) sticker showing its U-factor, SHGC, Visible Transmittance (VT), and Air Leakage. The sticker stays on through inspection. Three things LA homeowners get wrong on glass selection. First: orientation matters. North-facing windows have low solar exposure — SHGC can be higher (0.40-0.50) without hurting cooling load, letting in more daylight. South and west: lower SHGC (0.20-0.23) is critical — a $1,400 window with 0.35 SHGC on a west-facing wall will add $40-$70/month to your summer DWP bill compared to a 0.21 SHGC. Second: low-E coating type. There are two main low-E coatings — 'solar control' (Cardinal LoE 366 or equivalent, blocks 95%+ UV, ideal for LA) and 'high-solar gain' (LoE 270, lets more solar through, designed for colder climates). LA homeowners want LoE 366 on south/west, LoE 270 acceptable on north. Third: argon vs krypton fill. Standard dual-pane uses argon between the panes — cheap, effective, 90% as good as krypton. Triple-pane uses krypton in the smaller gaps — only worth it if you're already going triple-pane for acoustic or extreme climate (rare in LA except near LAX or in the high desert).
Acoustic glass for LAX flight-path neighborhoods — STC ratings and what they mean
If you live in Westchester, Playa del Rey, El Segundo, Hawthorne, southern Inglewood, north Manhattan Beach, or the western edge of Culver City, jet noise from LAX is in your house every 60-90 seconds during peak operations. Standard dual-pane glass blocks about 25-28 decibels (STC 26-28 rating). A 90-decibel 737 flyover becomes a 62-65 decibel intrusion — 'loud conversation' level. Acoustic glass changes this. STC 35 dual-pane laminated: blocks 35 decibels, jet becomes 55 dB ('moderate background'). STC 38-40 triple-pane laminated: blocks 38-40 decibels, jet becomes 50-52 dB ('quiet office'). STC 42-45 luxury laminated with offset glass and a third laminated pane: 45 decibels, jet becomes 45-48 dB ('quiet library'). Cost premium over standard: STC 35 adds $400-$800 per window, STC 38-40 adds $1,200-$2,400, STC 42+ adds $2,400-$5,800. We've done full-home acoustic packages on Westchester homes for $52K-$95K and watched homeowners stop noticing the jets entirely. Bonus: acoustic glass is also impact-rated in most product lines, useful for the coastal-storm exposure on Manhattan Beach front-row and Malibu PCH-adjacent.
EPA RRP lead-safe — the legal requirement most LA contractors skip
EPA Renovation, Repair, and Painting (RRP) rule: any work that disturbs more than 6 sq ft of painted surface on a house built before 1978 (which is 60% of LA single-family housing stock) must be done by an EPA-certified firm using EPA-certified renovator-led containment. Window replacement always disturbs the painted window casing, sill, and frame trim — well over 6 sq ft per window. The legal requirement is not optional. Penalties: up to $37,500 per violation per day. The reality on the ground: maybe 20% of LA window contractors are EPA-RRP certified. The other 80% either don't know the rule, don't bother, or hand you a half-page waiver hoping you don't ask questions. We are EPA-RRP certified. Every pre-1978 job ships with a 6mil poly containment, HEPA-vacuum cleanup, certified-renovator on-site supervision, and a signed EPA disclosure pamphlet ('Renovate Right') for your file. The cost: $600-$1,400 added to a full-home replacement — cheap insurance against a $37K-per-day federal penalty, and — more importantly — against creating a long-term lead-dust hazard in your house for your kids. We pull a lead-paint swab test on day one ($45-$120 per test) for any pre-1978 house and tell you whether the trim tests positive. If it doesn't, we still document the negative result and skip containment; if it does, we contain.
How we run a window-replacement job — fixed bid, lead-safe, one project lead
Day 0: free 45-60 minute in-home consult. We measure every opening, photograph existing conditions, identify any structural rot or settled framing, note painted-trim age, scope flashing condition, and ask about your acoustic exposure (LAX flight path, freeway proximity, train tracks). Day 4-5: fixed-bid PDF, line-itemed per window with manufacturer + model + frame color + glass spec + installation method, plus EPA-RRP containment line items for pre-1978 homes, plus any flashing/framing repair line items. Day 14: 10% deposit on signing, we order windows (lead time: 4-8 weeks for standard, 8-14 weeks for custom-size or wood-clad premium). Day 30-90: windows arrive at our warehouse, we schedule install. Install day(s): typically 8-15 windows per day per crew, full-home 15-25 windows runs 2-4 days. EPA-RRP containment up on day one, lead-safe HEPA cleanup at end of each day, paint touch-up on interior trim within 48 hours of install. One project lead per job. His cell on the contract. He answers. No permit required for window-only replacement in LA when matching opening size; permit required for any opening enlargement, new opening, or door replacement that affects egress (bedrooms require minimum 5.7 sq ft net clear opening).
Door replacement — exterior, patio, and interior
Three door categories with very different price and complexity. Exterior entry door ($1,800-$8,500 installed). Standard solid-core insulated steel with insulated frame ($1,800-$2,800). Fiberglass with glass insert ($2,800-$4,800). Wood-clad with custom panel ($4,800-$8,500). Includes new threshold, jamb, weatherstrip, locks, and hardware. Patio / sliding / multi-slide door ($3,800-$28,000 installed). Standard vinyl 6-foot slider ($3,800-$5,800). Aluminum-clad 8-foot slider ($5,800-$9,400). Multi-slide 12-16 foot ($14,000-$22,000). Bi-fold or accordion 12-20 foot ($18,000-$28,000). All NFRC U-factor 0.30 max, SHGC 0.23 max for code. Western Window Systems, Andersen E-Series, Marvin Signature, La Cantina, NanaWall. Interior door ($300-$1,800 per door installed). Standard hollow-core ($300-$500). Solid-core ($500-$900). Custom panel or barn-door ($900-$1,800). We install hardware (knobs, latches, hinges) included; smart locks (August, Schlage Encode, Yale Assure) add $250-$450 per door. Egress: any door that opens to an egress path (bedroom, sleeping area) must meet code — net clear opening of 5.7 sq ft minimum, 24 inches height min, 20 inches width min, sill height max 44 inches. We measure for egress on every bedroom door replacement and tell you if your existing opening doesn't pass.
Why design-build + 33 trades in-house wins on window and door work
Standard LA window contractor: orders windows, sends an install crew, leaves you with the painter. The painter doesn't show. The interior trim is half-finished. The flashing detail is wrong and you find out 14 months later when the first heavy rain leaks at the head jamb. We don't do that. NPLD is a full-service GC. Window install + interior trim paint + flashing + stucco patching (when frame size changes) + interior wall texture matching + final caulking — all under one CSLB license. When the patio-door install requires reframing the header (because the original 1962 framing used undersized lumber), our framing crew is on-site the same day. When the stucco patch needs to match a 50-year-old finish, our stucco sub is on the roster. One contract, one schedule, one project lead. We also stand behind the installation — manufacturer warranties on windows are 10-20 years for the unit, but workmanship is whatever the installer offers. Ours: lifetime labor warranty on every window we install. If the seal fails or the frame warps from improper installation, we fix it free as long as you own the house.
Frequently Asked Questions
Do I need a permit to replace my windows?
Window-only replacement in matching opening sizes does not require a permit in LA. Permit required if: (1) you enlarge an opening, (2) you cut a new opening, (3) you replace a bedroom window where the egress dimension changes, (4) you replace exterior doors (some jurisdictions). We tell you on day one which path your scope requires.
What's the difference between U-factor and SHGC?
U-factor measures heat transfer through the window (how well it insulates) — lower is better, 0.30 max for LA code. SHGC measures how much solar heat the glass lets through — lower is better for hot climates, 0.23 max for LA code. North-facing can run slightly higher SHGC (more daylight). South/west should be at or below 0.23 with LoE 366 solar-control coating.
Do you do acoustic glass for LAX flight-path houses?
Yes. Most common spec near LAX: STC 35 dual-pane laminated, adds $400–$800 per window over standard. Higher protection (STC 38–40) uses triple-pane laminated, adds $1,200–$2,400. We've done full-home acoustic packages in Westchester, Playa, El Segundo, and Inglewood.
Is my house lead-safe? Do you handle EPA-RRP?
If your house was built before 1978 (60% of LA single-family), federal law requires EPA-RRP certified work. We are certified. We test painted trim on day one ($45–$120/swab); if negative, no containment cost; if positive, we contain with 6mil poly, HEPA-vacuum cleanup, certified-renovator on-site supervision ($600–$1,400 line-itemed).
Which brand should I buy — Milgard, Andersen, Marvin, Pella?
Standard tier: Milgard Trinsic (best vinyl value in CA), Jeld-Wen Builders. Mid-tier: Milgard Tuscany (composite frame, lifetime glass-breakage warranty), Andersen 100 Series (Fibrex frame). Premium: Marvin Elevate (fiberglass exterior + wood interior), Andersen 400 Series, Sierra Pacific H3. Luxury: Marvin Signature, Andersen E-Series, Western Window Systems multi-slide. We spec by exposure, budget, and architectural style.
How long is the lead time on windows?
Standard vinyl: 4–8 weeks. Mid-tier composite/fiberglass: 6–10 weeks. Wood-clad or aluminum-clad premium: 8–14 weeks. Custom sizes or specialty shapes: 10–18 weeks. Luxury acoustic/impact: 10–16 weeks. We order on signing and schedule install when units arrive at our warehouse.
Can you replace just one or two windows, or do I have to do the whole house?
We do both. Single-window replacement: $850–$5,500 depending on tier and frame material. Full-home (15–25 windows): typically $24K–$95K standard-premium. Doing them all at once is more cost-effective per window (volume install discount), but we do single-window replacements all the time, especially for failed seals or broken glass.
Do you do patio doors and multi-slides?
Yes. Standard vinyl 6-foot slider $3,800–$5,800. Aluminum-clad 8-foot slider $5,800–$9,400. Multi-slide 12–16 ft $14K–$22K. Bi-fold or accordion 12–20 ft $18K–$28K. Western Window Systems, La Cantina, NanaWall, Marvin Signature, Andersen E-Series.
What if the framing under my window is rotted?
Pre-install inspection catches most rot. We line-item repair before install (typical: $300–$1,400 per window for sill / king-stud / header replacement). If we find unexpected rot during install, the pre-priced amendment in your contract covers it — no surprise charge.
Will you fix the stucco and paint around the new windows?
Yes. Exterior stucco patching, interior drywall repair, trim repaint (both sides), final caulking — all in-house, line-itemed in your bid. We don't leave you to coordinate a separate painter or stucco sub.
Hablan español?
Sí. La cuadrilla de instalación es bilingüe, estimaciones y contratos en los dos idiomas, líder del proyecto bilingüe — usted escoge el idioma.
What's your warranty?
Labor: lifetime warranty as long as you own the house — seal failures, frame warp, install-related leaks, all fixed free. Manufacturer warranty on the window unit (typically 10–20 years on glass, 20 years to lifetime on frame depending on brand) passes through to you; we register every window on your behalf so the warranty is active from day one.
Free LA window & door consult — 45–60 min, every opening measured, NFRC + STC + EPA-RRP plan in 5 days. Text or call (818) 605-1388 or book online. CSLB #1105249. Hablamos español.
(818) 605-1388 · Netanel Presman · NP Line Design · CSLB GC #1105249 · BBB A+