Window Installation Contracts: What Should Be Included

A proper contract protects both you and the installer. According to the Better Business Bureau, getting everything in writing prevents disputes and ensures clear expectations.

Essential Contract Elements

According to BBB and Idaho Division of Building Safety:

Party Information

• Contractor's full legal business name
• Contractor's license/registration number
• Business address and contact information
• Your name and property address

Scope of Work

According to FGIA, detail should include:

Windows:

• Exact manufacturer and product line
• Model numbers if available
• Sizes and quantities
• Frame color/finish
• Glass specifications (Low-E, gas fill, etc.)
• Hardware finish

Installation:

• Installation method (pocket vs. full-frame)
• Interior trim scope
• Exterior trim/capping scope
• Flashing materials and method
• What happens with old windows

Pricing

• Total contract price
• Itemization (windows, labor, materials)
• What's included vs. excluded
• Conditions that could change price
• How change orders are handled

Payment Terms

According to BBB guidance:

• Payment schedule (milestone-based recommended)
• Maximum deposit (Idaho has no statutory limit, but 30-50% is typical)
• Final payment due upon completion and inspection
• Accepted payment methods
• Finance terms if applicable

Timeline

• Project start date (or date range)
• Expected duration
• What happens if delayed
• Weather contingencies

Warranty Information

• Manufacturer warranty summary
• Installer workmanship warranty
• Duration and coverage details
• How to make warranty claims
• What voids warranty

Permits

• Who pulls permits
• Permit costs included or separate
• Inspection responsibility

Protective Clauses to Include

According to BBB recommendations:

Insurance verification

"Contractor shall maintain liability insurance of at least $_____ and provide certificate upon request."

Change order process

"No changes to scope or price without written change order signed by both parties."

Cleanup

"Contractor responsible for daily cleanup and final debris removal."

Dispute resolution

Clear process for handling disagreements (mediation before legal action).

Red Flags in Contracts

According to Idaho DBS and BBB:

• No written contract offered
• Contract is just a proposal with "see above" pricing
• Large upfront payment required (more than 50%)
• No warranty language
• "Time is of the essence" pressure
• Waiver of your legal rights
• Vague or open-ended pricing

Before You Sign

According to BBB guidance:

1. Read everything - Don't sign under pressure
2. Ask questions - Get unclear items explained
3. Get changes in writing - Verbal promises don't count
4. Keep a copy - Get your copy before they leave
5. Understand cancellation - Idaho allows 3 days for door-to-door sales

The Bottom Line

According to FGIA, a thorough contract is a sign of a professional installer. Don't work with contractors who resist putting things in writing. The contract protects both parties and sets clear expectations.

*For complete hiring guidance, see: [Choosing a Window Installer](/guides/choosing-window-installer)*