Custom Doors & Windows

Flashed Openings. Coastal Hardware. Title 24 Compliant.

Window and door replacement means removing the old units, correcting the framing and flashing around each opening, and installing new units that meet California's Title 24 energy requirements, normally under a city building permit. Paragon Home Services replaces windows, entry doors, sliding and folding patio doors, and interior doors throughout the South Bay. Near the water in Manhattan Beach, Hermosa Beach, and along the Palos Verdes coast, salt air chews through budget rollers, hinges, and locksets within a few years, and wind-driven rain finds every gap in badly flashed stucco. We match frame material and hardware to your home's exposure, then detail each opening so it drains outward and keeps operating smoothly.

Choosing Windows and Doors for a Coastal Home

Our Window and Door Replacement Process

1. 01Opening-by-opening assessment — we measure every window and door, probe sills and framing for water damage, test operation, and note which openings need safety glazing or egress sizing.
2. 02Product and method recommendation — frame material, glass package, hardware finish, and retrofit versus full-frame installation are specified per opening, with the reasoning explained.
3. 03Written quote and ordering — the fixed-price proposal lists each unit and its installation method; on approval we order, since custom windows and doors carry manufacturer lead times.
4. 04Permit and association approvals — we file with your city building department and help assemble submittals for any homeowners association or architectural review board that has jurisdiction.
5. 05Removal and opening prep — old units come out one opening at a time, damaged framing is repaired, and sill pans and flashing are installed so water drains to the exterior.
6. 06Installation and sealing — units are set plumb, level, and square, shimmed at the right points, insulated with low-expansion foam, and sealed with products compatible with stucco, siding, or trim.
7. 07Trim, stucco patch, and final inspection — interior and exterior finishes are restored, every sash and door is adjusted to latch and lock properly, and the inspector signs off.

Door & Window Services

• Whole-house window replacement
• Retrofit and full-frame window installation
• Vinyl, fiberglass, aluminum, and wood-clad windows
• Casement, sliding, picture, and bay windows
• Tempered and laminated safety glass
• Sliding patio door replacement
• Folding and multi-slide door systems with structural headers
• Fiberglass and wood entry door installation
• French doors and garden doors
• Interior and prehung door installation
• Sill pan, flashing, and water-intrusion repair
• Rotted jamb, sill, and framing repair
• Stucco and siding patching around openings
• Corrosion-resistant hinges, rollers, and locksets
• HOA-compliant material specifications

Why Homeowners Trust Paragon With Their Openings

• A licensed general contractor that owns the framing, flashing, stucco, and trim, not just the unit
• Installation method decided opening by opening, instead of one retrofit approach for the whole house
• Permits pulled and Title 24 documentation kept in place for final inspection
• 18+ years working on South Bay homes from the beach cities to the Palos Verdes hills

Doors & Windows — Frequently Asked Questions

How much does window replacement cost in the South Bay?

Typical 2026 South Bay pricing runs about $900 to $1,800 per opening installed for standard-size vinyl retrofit windows, and roughly $1,800 to $4,000 or more per opening for fiberglass, aluminum, or wood-clad units and full-frame installations. A whole-house project on an average three-bedroom home frequently lands between $15,000 and $45,000. Sliding patio door replacement generally runs $4,000 to $10,000, while large folding or multi-slide systems that need a new header can reach $20,000 to $50,000. Frame material, glass options, installation method, and stucco repair drive the total. Paragon gives a fixed quote after measuring on site.

Do I need a permit to replace windows?

In most South Bay cities, yes. A permit lets the inspector verify energy code compliance, safety glazing, and bedroom escape openings, even when the new window fits the existing opening exactly. Enlarging an opening or widening it for a patio door adds structural review, because the header above has to be resized for the longer span. Homes in the Los Angeles portions of the South Bay, such as San Pedro and Westchester, go through LADBS, and unincorporated communities go through LA County. Paragon pulls the permit and leaves the NFRC labels attached until the final inspection is complete.

What window frame is best for a home near the beach?

There is no single right answer, but fiberglass is the most balanced choice for many coastal South Bay homes: it does not corrode, it moves at close to the same rate as the glass it holds, and it takes paint. Good vinyl is the value pick and does fine if you avoid very dark colors on sun-facing elevations. For slim modern frames, choose aluminum with a thermal break and a finish the manufacturer rates for seaside exposure. Whatever you install, rinse salt off tracks and sills and keep the weep holes clear, since blocked weeps are a common cause of sill leaks.

Where is tempered glass required?

Safety glazing, usually tempered glass, is required anywhere someone could walk into or fall against it. That includes glass in a door, glass within roughly two feet of a door's edge, glass in and around tubs and showers when it sits less than about five feet above the standing surface, large panes close to the floor, and glazing next to stairs and landings. Replacement units in those spots must comply even if the originals did not. Tempered glass carries a small permanent etched stamp in a corner, and inspectors look for it before signing off.

Can you replace a sliding door with a folding or multi-slide door?

Usually, and it is one of the most requested upgrades on South Bay homes that open to a patio or an ocean-view deck. The complication is the opening itself. A wider door needs a longer, deeper header to carry the roof or floor above, which means engineering, a structural permit, and temporary shoring while the wall is open. A flush interior threshold requires recessing the track, and exposed coastal elevations need a sill detail rated for wind-driven water. We look at the framing and the exposure first, then price options from a simple slider up to a full-width system.

How long does window and door installation take?

Most of the calendar time is manufacturing. Custom windows and doors commonly take several weeks to a few months to arrive after the order is placed, depending on brand, material, and size. The installation itself is quick: a crew can often replace the windows in a typical single-family home in a few days, working one opening at a time so the house is never left open overnight. Full-frame installations with stucco repair and large patio door systems take longer because of framing, flashing, and patching. We confirm delivery before scheduling, so nothing sits open waiting on a shipment.

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