The AI Receptionist Built for Window & Door Contractors
A broken window is a security emergency. A full-house window replacement is $25,000+. The contractor who answers wins the call — and the home for the next 20 years. SubCall picks up in 3 seconds.
- Set up in under 90 seconds
- No hardware
- Works with your existing number
- $349/mo
Why Window & Door Contractors Lose Quotes Worth $25,000+ to Voicemail
You're 12 windows into a 14-window full-home replacement. You and your installer are on ladders, removing the old aluminum frames and prepping for the new fiberglass install. Your phone is in the truck. By the time you climb down at 3pm to grab water, you have 7 missed calls and 2 voicemails.
One is a homeowner with a broken window after a kid's baseball — they want it fixed today before it gets cold tonight. One is a homeowner asking about a full-house window replacement after seeing their utility bills jump — typical $20,000-$35,000 job. One is a real estate agent needing a stuck patio door fixed before a Friday showing. The last is a GC asking for a sub bid on entry doors for 6 new construction homes. By 5pm, the broken-window homeowner has someone else on the way. By 7pm, the full-house replacement prospect has booked an in-home estimate with the next contractor.
The U.S. windows and doors market is valued at $28.67-$39.76 billion in 2024-2025, projected to grow at 3.4-5.26% CAGR through 2030-2035 (GreenSky / Harvard JCHS 2025; Market Research Future). The global windows and doors market sits at $203-216 billion in 2025, projected to reach $355-363 billion by 2035 at 5.5-5.8% CAGR. The door and window repair service market specifically sits at $28.44 billion globally in 2025, projected $36.19 billion by 2029 at 6.2% CAGR (The Business Research Company).
Residential projects accounted for 58.18% of the windows and doors market in 2025. Demand for renovation and replacement is growing faster than new construction — elevated borrowing costs have locked most homeowners into favorable mortgage rates, channeling discretionary capital toward upgrades rather than relocation.
— Mordor Intelligence Windows and Doors Market 2026-2031
The ticket math is significant. Single window replacement runs $400-$1,200 installed. Full-house replacement (15-25 windows) runs $12,000-$40,000+. Entry door replacement runs $1,500-$5,000. Patio door replacement runs $2,500-$8,000. Cross-trade missed-call analysis from CallBird AI puts the average annual loss at $45,000 to $120,000 per business — for a window company, missing a single full-house quote can equal the upper end. The other compounding factor: window and door customers are lifetime customers. The homeowner who hires you to fix a broken window calls you 5 years later when they want energy-efficient upgrades.
Every Quote Captured. Broken Windows Dispatched. Energy Upgrades Routed.
SubCall is purpose-built for window and door contractors. It answers every call in under 3 seconds with your business name, asks window/door-specific qualifying questions, identifies broken-window security emergencies, captures window count and material preferences, books in-home estimates, and routes everything to your dashboard.
Customer calls your existing number.
Your business line forwards to SubCall. No app to install. No hardware. No number change.
SubCall picks up in under 3 seconds.
"Thanks for calling Bristol Window & Door, how can I help you?"
The AI asks window/door-specific qualifying questions.
Window or door — and is this a repair, single replacement, or full-home replacement? If broken — broken pane, broken frame, stuck open, security concern? How many windows or doors? Home age, current install (single pane, double pane, low-E)? Material — vinyl, fiberglass, wood, clad wood, aluminum? Energy efficiency, security, or aesthetic? Residential, commercial, or new construction? HOA requirements? Real estate timeline — listing, closing, refinance? A broken window after a break-in becomes an emergency dispatch. A homeowner asking about 18-window full-house replacement becomes a high-priority in-home estimate.
The job lands in your dashboard. Your estimator gets a text.
SMS with customer name, address, project scope, urgency, HOA status, and real estate timing context.
It Knows a Broken Pane From a $30,000 Full-House Quote
Generic answering services treat every window call the same. SubCall runs different protocols for broken-window emergencies, full-house replacements, real estate timing, GC sub work, and historic/energy consultations.
Broken Window (Security Emergency)
“A baseball broke my front window and the glass is shattered. It's supposed to get cold tonight.”
“Let's get this secured today. Quick questions: roughly the size of the window, is it a single pane or double pane unit (most modern windows are double pane and need a unit replacement, not just glass), is the frame damaged or just the glass, and is the home occupied? In the meantime, you can tape plastic sheeting over the opening to keep heat in until we arrive. I'll dispatch a tech today.”
The AI captures diagnostic detail (single vs double pane — completely different repair scope) and provides immediate damage mitigation (tape plastic sheeting) while dispatching.
Full-House Replacement (Highest Value)
“I'm thinking about replacing all the windows in my house. We've been here 20 years and the originals are aluminum, single pane. My utility bills are crazy.”
“Energy efficiency is a great reason — modern windows can cut your bills 20-30%. Quick questions: roughly how many windows total, do you have a sense whether you want vinyl, fiberglass, or wood, are any of them custom shapes (bays, bows, arched), and when are you hoping to have this done? I'll book an in-home estimate within a week — full-home replacements need an in-person measurement to quote accurately.”
Full-house replacements are typical $20,000-$40,000 jobs. The AI captures qualifying detail so your estimator arrives prepared with appropriate product samples.
Real Estate Pre-Showing Fix (Time-Sensitive)
“I have a listing showing on Friday and the patio door is stuck — it won't open or close properly.”
“Pre-showing fixes are common. Quick questions: roughly when did the issue start, is the door a sliding patio or a French door, and is the issue with the track, the rollers, or the locking mechanism? I'll get our tech scheduled before Friday.”
Real estate agents are repeat-customer goldmines. SubCall captures diagnostic detail (door type, mechanism issue) that determines parts needed.
New Construction GC Sub Inquiry
“We're building 6 single-family homes in the Madison development and need a contractor for the entry doors — front and back doors per house.”
“Happy to bid. Quick questions: are these custom builds or spec homes, what's your spec for the entry doors — fiberglass, steel, wood — what's your finishing schedule timeline, and do you need us to provide and install, or just install your specified product? I'll route to our new-construction lead.”
Multi-home GC sub work is consistent recurring revenue. The AI captures spec detail (door material, finish, timeline) that makes your bid competitive.
Why Window & Door Contractors Pick SubCall Over Answering Services or Hiring
| SubCall | Generic Answering Service | Hiring a Receptionist | |
|---|---|---|---|
| Answers 24/7 (broken window emergencies) | ✓ Included | Upcharge | Requires overtime |
| Knows window/door terminology | ✓ Built-in per trade | Generic script | Months of training |
| Identifies broken window security emergencies | ✓ Trained protocol | ✗ Takes message | Inconsistent |
| Captures window count, material, sash type | ✓ Structured data | ✗ Free-form notes | Inconsistent |
| Real estate timeline routing | ✓ Specialty intake | ✗ | Manual |
| New construction GC qualifying | ✓ Trained protocol | ✗ | Inconsistent |
| Historic preservation / energy consultation | ✓ Trained protocol | ✗ | Inconsistent |
| Dispatches via SMS | ✓ Instant | ✗ | Manual |
| Monthly cost | $349 | $400–900 | $3,500+ ($42K/year) |
| Setup time | Under 90 seconds | 3–5 days | Weeks |
A $28–$40 Billion U.S. Window & Door Market. Homeowners Are Staying Put — and Upgrading.
The U.S. windows and doors market sits at $28.67-$39.76 billion in 2024-2025, projected to reach $35-69.87 billion by 2030-2035 at 3.4-5.26% CAGR (GreenSky / Harvard JCHS 2025; Market Research Future). The global market is $203-216 billion in 2025, projected to hit $355-363 billion by 2035 at 5.5-5.8% CAGR (Global Market Insights; Mordor Intelligence; Market Research Future). The door and window repair service segment alone is $28.44 billion globally in 2025, projected $36.19 billion by 2029 at 6.2% CAGR (The Business Research Company).
Residential held 58.18-66.8% of the global windows and doors market in 2025 (Mordor Intelligence; Grand View Research). U.S. residential demand splits roughly 45% new construction and 55% renovation/replacement (GreenSky 2025), with renovation and replacement growing faster than new construction. Elevated borrowing costs have locked most homeowners into favorable mortgage rates, channeling discretionary capital toward upgrades rather than relocation. Homeowners spent $513 billion on renovations and maintenance in Q1 2025 alone (Harvard JCHS).
Vinyl windows hold approximately 44.2% of residential window replacements, followed by fiberglass at 15.7%, wood at 15.0%, clad wood at 10.7%, and aluminum at 10.6% (HIRI). ENERGY STAR Version 7.0 update is pushing U-factor performance requirements toward 0.22 in colder U.S. climates (Mordor 2026-2031), driving net-new replacement demand from homeowners trying to meet utility-rebate thresholds.
Window & door contractor FAQ
Stop Losing Full-House Window Quotes to Voicemail
A single captured full-house window replacement pays for 5-10 years of SubCall. A missed call is a competitor's $25,000 job. SubCall answers every call — for $349/month, with setup under 90 seconds.
Get startedLive in under 90 seconds. No hardware. Works with your existing number.