Free in-home measure and quote - PGT, CGI and CWS impact lines compared on your actual openings, style by style
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AfterFast, Reliable Door Installation Across San Marcos
Door installation in San Marcos usually runs between $850 and $3,400 depending on the door type, frame condition, and whether we’re replacing a slab or the full prehung unit. Most standard entry door replacements in San Marcos take one day, and our crew arrives with the door, hardware, and written scope already in hand. If your 1990s tract-home door is sticking, drafting, or showing frame cracks, call (509) 265-6387 and we’ll schedule a measured survey you keep, whether or not you hire us.
Sonia Raman oversees every San Marcos install. Our crews work these neighborhoods regularly: Discovery Hills, San Elijo Hills, and the older subdivisions along Rancho Santa Fe Road. We know what fails here and why, which means the price we write is the price that holds.
Why Sightline Windows & Doors Is San Marcos’s Preferred Door Installation Company
San Marcos residents call us because the quote doesn’t move. Haven Clause 1 is the founding rule: the measured survey and the written price are the same document. That matters in a city where nearly everyone lives in a home built between 1990 and 2010, and where a door that looked fine at inspection turns out to have a rotted jamb or a warped frame once the old unit comes out. We write that discovery into the scope before work starts, not as a change order after.
Every technician who shows up in San Marcos is background-checked, uniformed, and arrives with a license number you can verify before they step inside. That’s Haven Clause 3, and it’s printed on the job paperwork. We also leave a photo record of the work: the old door out, the rough opening, the new unit sealed and set, and the trim finished. Evidence on every job, Clause 4.
The Door Installation team at Sightline works from the brand’s Austin office for scheduling and dispatch, but the crews that serve San Marcos live and work in the I-35 corridor between Kyle and San Marcos. That means we’re not driving from another metro to reach you; we’re already running routes through the city weekly.
Our Door Installation Services in San Marcos
Entry Doors
A new entry door in San Marcos has to do two jobs at once: seal against summer heat that runs 15 to 20 degrees hotter than Carlsbad or Oceanside, and hold its shape through the thermal expansion that comes with those inland swings. Inward-swinging doors in this valley take the worst of it. The wood or fiberglass jamb expands in the heat, the door binds, and by the time the homeowner notices a draft, the weatherstripping is already compressed flat in the corners.
We replace the full prehung unit, not just the slab, on most San Marcos entry doors. That lets us set the new jamb square and seal it to the rough opening with backer rod and a proper exterior-grade sealant. The door swings clean and the air stops moving. Entry door replacement in San Marcos typically runs $1,200 to $2,800 for a standard single door with new hardware.
Hurricane-Proof Front & Entry Doors
San Marcos isn’t on the coast, but the valley topography channels Santa Ana wind through residential corridors with real force. Subdivisions like San Elijo Hills sit at the mouth of those wind funnels, and homeowners there regularly find that old doors leak not from rain, but from wind pressure. Impact-rated doors from CGI and CWS solve that with reinforced frames, heavy-duty hardware, and design pressure ratings that hold under sustained offshore wind loads.
Impact-rated entry doors in San Marcos run $2,400 to $4,800 installed, depending on size and whether you need a sidelite. That’s a meaningful price gap over a standard entry door, and we’ll explain in writing exactly what the impact rating buys you at your elevation and exposure. For most San Marcos homes, the answer is a door that doesn’t bow under a 60 mph gust and doesn’t let dust blow through the weatherstripping.
French & Double Doors
French doors in San Marcos tract homes fail in predictable ways. The builder-grade units installed in the 1990s and early 2000s came with thin aluminum thresholds and roller assemblies that wear out together. Once the threshold sags, the two door slabs no longer meet at the center, and the astragal gap opens up. You can see daylight through the middle of the door, and in summer you can feel the heat pouring in.
We install French and double doors from ES Windows and Therma-Tru with adjustable hinges, compression weatherstripping, and stainless steel rollers. The slabs are set dead plumb and the threshold is shimmed level before anchoring. Replacing a standard 6-foot French door in San Marcos runs $1,900 to $3,600. If we’re widening an opening or reframing, it goes up from there, and we’ll show you the line items before we start.
Replacement Doors
Most San Marcos replacement door work is fixing what the original builder installed. That usually means a fiberglass or aluminum door that’s been in the sun for 20 to 30 years. The frame cracks at the corners, the door rubs the jamb, and the weatherstripping has turned brittle and fallen out. We see this across entire blocks in Discovery Hills: same house, same door generation, same failure pattern. It’s the synchronized replacement market this valley created.
A standard replacement door with new frame, hardware, and trim in San Marcos runs $850 to $1,600 for a basic steel or fiberglass unit. If you want an upgraded Therma-Tru with a rot-resistant frame and better seals, plan on $1,500 to $2,500.
Storm & Exterior Doors
A storm door in San Marcos isn’t about snow; it’s about the late afternoon sun hitting the front of the house for four hours straight in August. A quality exterior storm door with a foam-filled frame and UV-stable glazing cuts direct solar heat gain on the primary entry by a measurable margin, and it protects the main door from the worst of the sun and dust. We install storm doors from ViewLux and Mr-Glass, typically in $700 to $1,400 installed, depending on glass and screen options.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
BeforeAfterTrusted Brands We Service in San Marcos
We draw from eight manufacturer lines and specify by performance tier, not by what’s sitting in a warehouse. For San Marcos homes, that usually means CGI or CWS when impact-rated framing is called for, Therma-Tru for fiberglass entry and sliding doors that need to resist heat and dust, and ES Windows for French and double door systems with adjustable hardware. We hold local parts stock for common San Marcos door sizes and frame profiles, which keeps turnaround tight on replacement work.
Common Door Installation Problems We See in San Marcos Homes
- Warped jambs from inland heat swings. Summer temperatures in San Marcos run 15 to 20 degrees hotter than the coastal cities just 8 to 10 miles west. That daily expansion and contraction cycle works on door frames the way ocean salt works on coastal hardware. After 20 years, the jamb has moved enough that the door no longer seals, and conditioned air escapes year-round.
- Decomposed-granite dust in sliding door tracks. The graded pads under most San Marcos subdivisions produce fine granite dust that works into tracks and abrades weatherstripping. The drafts stay invisible until a Santa Ana wind event pushes air through the worn seals hard enough to feel. We replaced a sliding glass door in San Marcos recently where the track was so packed with that dust that the door was riding on grit, not rollers.
- Cracked builder-grade frames showing up block by block. The fiberglass and aluminum door frames installed across San Marcos’s 1990s and 2000s growth boom are reaching end-of-life together. One street in Discovery Hills will have three or four doors show the same corner cracks in the same year. It’s a material fatigue problem, not a homeowner problem.
- Santa Ana wind pressure exposing seal failures. The valley funnels offshore wind through residential corridors, especially in San Elijo Hills. Doors that seemed fine in calm weather suddenly whistle and flap during a wind event. The fix is a fresh weatherstripping system and a door hung square in a solid jamb, not a thicker door sweep.
Pricing for Door Installation in San Marcos, TX
Here’s what we write on San Marcos estimates in 2026:
- Standard entry door replacement: $1,200 to $2,800
- Basic replacement door (slab and frame): $850 to $1,600
- Storm door with glass package: $700 to $1,400
- Impact-rated entry door: $2,400 to $4,800
- French or double door replacement: $1,900 to $3,600
These ranges assume standard 36-inch single or 72-inch double rough openings with no structural repair. If we find a rotted subfloor or a frame that’s moved out of plane, we photograph it, write the added scope on the same estimate, and get your written approval before cutting anything. The price on the paper is the price you pay. That’s Haven Clause 1, and it’s not a promotion; it’s the standard. Call (509) 265-6387 for a free measured survey and written quote.
We Also Serve Cities Near San Marcos
Sightline covers Door Installation in San Marcos and the surrounding corridor, including Kyle, Cibolo, Schertz, and Austin. If you’re just outside the city line, call (509) 265-6387 and we’ll confirm your address on the phone.
Serving San Marcos, TX - Our Local Coverage Area
We’re based in the San Marcos area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Door Installation in San Marcos
Because the builder-grade doors installed during the city’s population boom, when San Marcos more than doubled in size, all came from the same generation of low-spec weatherstripping and thin aluminum thresholds. Inland heat swings run 15 to 20 degrees hotter than coastal cities, so frames expand and contract daily. After 20 to 30 years, the seals are compressed flat and cracked, and the door leaks conditioned air. It’s a product-of-life failure hitting whole neighborhoods at once. Call (509) 265-6387 and we’ll inspect your jamb and weatherstripping and write the fix, not just tell you it’s old.
Santa Ana winds accelerate through the valley corridors around San Elijo Hills and press against door glass and seals with sustained wind loads that standard coastal-spec doors weren’t designed to handle. Fine decomposed-granite dust from the graded pads packs the tracks and abrades the weatherstripping first. Then the wind finds the gap. We specify sliding doors with design pressure ratings and upgraded stainless steel tracks for that subdivision. We replaced one Therma-Tru slider there after a wind event made drafting obvious that had been invisible all summer.
Not every San Marcos home needs impact-rated entry doors, but many benefit from them because the valley topography accelerates offshore wind through residential streets. If your home sits in a wind corridor like San Elijo Hills or an elevated section of Discovery Hills, an impact-rated CGI or CWS door with a design pressure rating will hold its shape when the wind hits. If you’re in a sheltered bowl and just want a door that seals tight against heat, a high-quality Therma-Tru entry door does the job at roughly half the price. We’ll tell you which one matches your exposure, in writing, with the price attached.
For a 1990s or early 2000s stucco tract home in Discovery Hills, we usually specify a Therma-Tru fiberglass door with a rot-resistant frame, compression weatherstripping, and an adjustable threshold. The original door was likely a thin aluminum or fiberglass unit with a one-piece threshold that sagged. The replacement we set is shimmed level, anchored into the rough opening, and sealed with backer rod and exterior-grade sealant. Typical installed price runs $1,500 to $2,500 for that home profile.
Yes, and the difference is measurable. A slider with worn weatherstripping and a dust-packed track leaks conditioned air every day of the year. In a San Marcos summer, that means your AC runs longer to hold temperature. A new sliding door with fresh seals, a level stainless track, and a proper install will stop that air movement. We can’t promise a specific utility reduction without seeing your home’s current leakage, but we will show you the old weatherstripping and the new, and you’ll feel the difference at the door before you ever check the bill. Call (509) 265-6387 to schedule a free measured survey.
Written by Sonia Raman, Owner at Sightline Windows & Doors, serving San Marcos since our first install in this area.