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ES Windows Home Additions & ADU: The Los Angeles Owner’s Guide
Adding square footage to a Los Angeles home with ES Windows already installed means matching new window and door packages to what’s already there. Mason Remodeling Co Los Angeles handles ES Windows-compatible home additions and ADU construction projects that typically run $53,100 to $153,400 depending on scope, foundation work, and finish level. Most homeowners discover they need this page when a permit gets flagged, an existing ES window frame shows rot at the sill, or a planned ADU requires matching fenestration across the property line.
You’ll usually know something’s off before we do: a window in the existing structure won’t seal, the addition’s rough openings don’t match your ES window sizes, or the city wants matching profiles on the new ADU. That’s where we come in. We’re an independent service provider, not affiliated with ES Windows, but we’ve worked with their product line across Los Angeles County long enough to know the quirks.
Key Takeaways
- ES Windows-compatible home additions and ADUs in Los Angeles run $53,100 – $153,400 installed.
- Matching existing ES window profiles to new work is where most projects stall; we handle that from the first site visit.
- Isaac Pruett, our owner, has worked residential construction across LA County for two decades.
- Every project gets a written price before work starts, and a 365-Day Done Right Promise after.
- Call (213) 632-5711 for a free estimate. A live person answers, 24/7.
Which ES Windows Models This Applies To
ES Windows builds aluminum and vinyl window lines that show up most often in mid-century and 1980s-era Los Angeles homes: the ES Aluminum Series (single- and double-hung, horizontal sliders, and fixed picture units) and the ES Vinyl Series (casements, awning windows, and sliding patio doors). If you’re adding an ADU or a room that will sit alongside the main house, city planning in Los Angeles often requires the new openings to match existing window and door profiles, not just in color but in frame depth and sightline width.
Here’s the compatibility gotcha: ES window frame depths are not uniform across their product generations. An ES aluminum slider from the 1990s measures differently at the jamb than a current ES vinyl equivalent, and ordering a custom door to fit a 5-3/4″ jamb when you actually have a 6-1/2″ jamb means a field fix nobody enjoys. Measure the actual frame depth, not the rough opening. If the sticker is still on the top of the sash, it’ll carry a series code; otherwise, send us photos of the corner joint and we’ll identify it before ordering. We specify OEM where the warranty and an existing finish need to match. Quality aftermarket equivalents work well for ADUs where the whole assembly is new and no match to an existing profile is required.
Styles & brands we work with
Signs Your ES Windows Home Additions & ADU Is Failing
- Condensation between the panes of an existing ES window. The seal on the insulated glass unit has failed. That’s the classic sign the existing window package isn’t going to hold up next to new construction.
- Difficulty opening or closing a sliding door on the existing structure. Over time, LA’s dry heat and occasional heavy rain warp unmaintained tracks, especially on ES aluminum sliders exposed to full sun.
- Water staining on interior drywall below an existing ES window. Chalk it up to a failed weep system or degraded exterior caulking. If you’re adding on adjacent to that wall, it has to be corrected before framing begins.
- Your Los Angeles permit reviewer flagged mismatched window types on the ADU plan. This is common. The city wants the new structure to complement the existing one, and that starts with the fenestration.
- The rough openings in the new addition don’t match your existing ES window sizes. Field measurements taken from the old frames and not from the actual rough openings cause this. An eighth-inch error becomes a visible gap at the trim.
See the difference
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After
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After
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AfterReplacement Cost & What’s Included
For a whole-room addition or ADU that includes ES Windows-compatible fenestration, Los Angeles homeowners should plan on $53,100 to $153,400. The spread comes down to square footage, whether you’re building up or out, foundation type, and whether the project is a straight addition or a full ADU with kitchenette and bath. A garage conversion that keeps the existing shell but adds ES-compatible windows and doors runs $35,400 to $94,400.
Every Mason Remodeling Co Los Angeles project includes a written line-item price before we start, permits pulled and inspections passed, and a written guarantee effective 365 days from the completion date. If anything covered by the guarantee fails in that window, we return and correct it at no cost. That’s the Done Right Promise, in plain terms. We don’t do verbal estimates that grow on the final invoice. We don’t do change orders without a signed agreement. You’ll know exactly what the number is before a single tool comes off the truck.
DIY or Call Us?
You can check a few things yourself without touching a saw: look at the ES window labels to identify series, measure frame depth at the jamb, and check for rot at the sills of existing windows that will sit adjacent to the new work. That gives you the information you need to have an intelligent conversation with anyone who bids the job.
What you shouldn’t do is frame rough openings based on old window sizes and hope for the best. On any project this size, the rough openings get set by the framing carpenter, and the window packages get ordered by whoever holds the written price. If those two people aren’t the same company, you’re the coordinator. With us, you aren’t. Isaac Pruett grew up in the San Fernando Valley watching his uncle rebuild houses on Roscoe Boulevard, trained in construction technology at LATTC downtown, and has run residential jobs across Los Angeles County for the better part of two decades. He’ll tell you himself: call (213) 632-5711 and we’ll set up a free estimate at your property.
FAQs
ES Windows in the Los Angeles climate generally last 20 to 30 years on the frames and 15 to 25 on the seals, with coastal fog zones (Venice, Playa del Rey, San Pedro) cutting seal life shorter than the dryer Valley neighborhoods. If your existing windows are past that mark and you’re adding on, plan to replace at the time of the addition instead of facing a retrofit later. Call (213) 632-5711 and we’ll assess your existing units as part of the free estimate.
Yes, in many cases an ES window can be repaired: seal replacements, track repairs, and hardware swaps are all possible on most series. If the frame itself is twisted or the sill has rotted through, replacement is the honest call. During an addition or ADU project, we’ll tell you which existing units are worth saving and which should go, and the estimate reflects that split. Call (213) 632-5711 for an exact assessment.
A typical Los Angeles home addition or ADU with ES-compatible windows takes 4 to 9 months from permit submission to final inspection, depending on scope, plan-check turnaround at the Department of Building and Safety, and whether you’re converting existing space or building from the foundation up. We’ll give you a written schedule with the written price, so you know what to expect before we start. Call (213) 632-5711 to talk through your timeline.
We stock the common ES-compatible hardware on our trucks: sash locks, track rollers, weatherstripping, and balance springs for the aluminum series we see most in Los Angeles. Complete window packages are ordered to spec once we’ve confirmed the exact ES series and rough opening dimensions. We also work with specification-grade product lines including KraftMaid for cabinetry and Cambria and Silestone for surfaces on the same project. Call (213) 632-5711 and we’ll confirm what we can bring to your site.
Written by Isaac Pruett, Owner, Mason Remodeling Co at Mason Remodeling Co Los Angeles, serving Los Angeles and nearby areas.
