Replacement Window Installer (Subcontract) Business

Install double-pane windows and doors for window dealers and general contractors, with no showroom or sales needed.

Startup cost$3k to $12k
Monthly revenue$4k to $18k
Time needed20+ h/week
First incomeWeeks

Estimates for a small start in the US, not guarantees.

Official data

6,945 US businesses with employees in this field, +2.8% in a year

NAICS 238150 “Glass and glazing contractors”. Source: U.S. Census Bureau, County Business Patterns 2023.

What it is

You fit double-pane replacement windows and doors that someone else has sold and ordered. That means measuring, removing old units, installing, sealing, flashing and trim. You work as a subcontractor for window dealers, remodelers and general contractors.

Your first three steps

  1. Check your state and city contractor licensing rules for window installation, and whether a subcontractor needs its own license
  2. Get general liability insurance and, if the homes may be older, ask about EPA lead-safe (RRP) certification
  3. Contact local window dealers and remodelers, show photos of your work and offer a paid trial install
Who pays

Window dealers, home improvement companies, remodeling contractors and property managers who need reliable installers.

How it makes money

Usually a set price per window or door installed, or a day rate. Faster, cleaner work means more installs per week and repeat jobs from the same contractors.

Skills that help
  • Carpentry and finishing basics
  • Accurate measuring
  • Working safely at height and with heavy glass
  • Reliable and tidy around customers' homes
Watch out for
  • State or local contractor license rules vary a lot, so check with your state licensing board and city or county
  • EPA lead-safe work rules may apply in homes built before 1978, so check requirements and training
  • General liability insurance, and workers' compensation if you hire helpers
  • Window damage, leaks and callbacks can come out of your pay, so agree warranty terms in writing
  • Heavy lifting and ladder work, so plan for safety and a helper on large units
  • Relying on one or two contractors for most of your work is risky

🔒 Full research report for US

Real cost breakdown with current prices, licences and registration checklist, local competition, pricing, break-even and a 30-day launch plan, with sources.

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Questions people ask

How much does it cost to start a window installation subcontracting business?

Startup costs are typically around $3,000 to $12,000, depending on your tools, vehicle setup and insurance. These are estimates, not quotes, so price your own tools and coverage before you commit to any spending.

How much can a subcontract window installer earn?

Monthly revenue is typically around $4,000 to $18,000, depending on how many hours you work, how many installs you book and whether you use a helper. This is an estimate of revenue before your costs.

Do I need a license to install windows as a subcontractor in the US?

Contractor license rules vary a lot, so check with your state licensing board and your city or county. Also check EPA lead-safe work rules for homes built before 1978, and what insurance you need, including general liability.

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