How to hire a window restoration craftsperson (questions + red flags)

Window restoration is specialized: it’s part carpentry, part paint science, part weatherization, part historical detailing. The right craftsperson will talk about windows as a system—and will ask you about moisture, comfort, and priorities before selling a “package.”

What good restoration usually includes

• Condition assessment (rot, glazing, joinery, frame geometry)
• Operability repair (cords/weights or balances)
• Air sealing strategy (appropriate weatherstripping, meeting-rail alignment)
• Paint and glazing plan (including lead-safe approach where relevant)
• Storm window recommendation (when appropriate)

This aligns with NPS’s emphasis on evaluation and planned repair as the source.

Interview questions that reveal competence

1. “Where do these windows usually leak, and how do you address that?”
   Look for meeting-rail/jamb/trim-to-wall answers—not “the glass is old.” More on old windows & drafts.
2. “How do you handle lead paint risk in pre-1978 homes?”
   They should discuss containment and lead-safe workflow; EPA’s RRP framework is a baseline reference in the industry. Get a free DIY checklist here.
3. “What weatherstripping do you prefer for double-hungs, and why?”
   Expect a reasoned choice (durability, friction, fit tolerance). Explore more on weatherstripping types.
4. “Do you recommend storms? Interior or exterior?”
   A thoughtful pro will discuss condensation and appearance; DOE notes both interior and exterior low-e storms can improve comfort and reduce costs.
5. “How do you document profiles and match materials if parts must be replaced?”
   You want respect for existing profiles and joinery.

Red flags

“We’ll caulk it shut; nobody opens windows anyway.”

Heavy focus on replacement without diagnosing moisture/air leakage pathways

No lead-safe plan for older homes

No discussion of storms, weatherstripping, or meeting-rail alignment

Vague scope (“we’ll restore them”) without listing what gets repaired

Bid comparison tips

Ask each bidder to specify:

1. What is repaired vs replaced?

2. What weatherstripping system is included? More on weatherstripping

3. What glazing approach is planned?

4. How paint will be handled (and timeline/compatibility)?

5. How they’ll protect your home from dust and debris?

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