Replacing your windows is a significant investment, and most homeowners only go through the process once or twice. That leaves little room to learn as you go. Knowing the right questions to ask before a window replacement can be the difference between a project that goes smoothly and one that leaves you with surprises on installation day.
Here is what to ask, and why each answer matters.
1. What type of replacement window is right for my home?
Not all replacement windows are the same, and the right choice depends on your home’s construction, the condition of your existing frames, and what you are hoping to accomplish.
Full-frame replacements remove everything down to the rough opening. That is the right approach when frames are rotted, damaged, or out of square. Insert replacements fit into your existing frame and work well when the frame is structurally sound, and you want a cleaner, less disruptive installation.
Ask your consultant to explain which approach fits your situation and why. If they skip that conversation and go straight to pricing, pay attention to that.
2. What is the window frame made from?
Vinyl, wood, aluminum, fiberglass, and composite materials all perform differently over time, particularly in climates with wide temperature swings like Wisconsin.
Renewal by Andersen windows use Fibrex, a patented composite material that combines the strength of wood with the low maintenance of vinyl. It resists warping, cracking, and peeling without needing paint. Regardless of who you are talking to, ask what the frame is made of and how it holds up in your local climate over 20 or 30 years.
3. What are the energy efficiency ratings?
Two numbers to ask about: U-factor and Solar Heat Gain Coefficient (SHGC). U-factor measures how well a window insulates against heat loss. Lower is better. SHGC measures how much solar heat passes through the glass, and the right number depends on your climate and how your windows are oriented.
Also, you should ask whether the windows are ENERGY STAR certified and which climate zone they are rated for. In Wisconsin, thermal performance is not optional.
4. Who does the actual installation?
This matters more than most homeowners expect. A well-made window performs poorly when it is installed incorrectly. Air infiltration, water intrusion, and early failure often trace back to the installation, not the product itself.
Ask whether the company uses its own trained installers or subcontracts the work. At Renewal by Andersen, installation is handled by our own certified team. That keeps quality control consistent and makes accountability straightforward if anything needs attention down the road.
5. What does the warranty actually cover?
Window warranties can sound strong until you read the details. Before you assume you are covered, ask:
- Does the warranty cover the product and the installation, or just the product?
- Is it transferable if you sell your home?
- What voids the warranty?
- Who handles warranty claims: the manufacturer, the installer, or someone else?
A warranty that covers both labor and materials is meaningfully different from one that does not. Make sure you know who is responsible if something goes wrong five years from now.
6. How long will this take, and what does the process look like?
Get a realistic timeline from the initial measurement to installation day, and ask what to expect when the crew arrives. How many windows can they complete in a single visit? Will you need to be home? How do they protect your floors, furniture, and walls during the work? What happens if they find unexpected damage behind the old frame?
A contractor with real experience answers these questions without hesitation.
7. What is included in the quote?
Window replacement quotes can vary widely depending on what is included. Before you compare numbers from different contractors, confirm:
- Is the removal and disposal of the old windows part of the price?
- Does it include interior and exterior trim work?
- Are there additional charges if there is damage behind the existing frame?
- Who handles permits if your municipality requires them?
A lower quote that excludes several of these items is not necessarily a better deal. Ask for a written breakdown, so you know what you are actually comparing.
8. How much maintenance will these windows need?
Some windows need periodic sealing, repainting, or adjustments to hardware. Others require almost nothing. Ask the manufacturer what they recommend and whether that is realistic for how you actually use your home.
If you are replacing wood windows partly because of the upkeep they require, make sure the new product does not just trade one set of maintenance tasks for another.
9. Can you show me examples of work you have done locally?
References and local project photos give you a real-world picture of what to expect. A company with a solid track record in your area and customers willing to speak to it carries more weight than a polished sales presentation.
10. What happens after the installation is finished?
Ask about the follow-up process. Is there a walkthrough once the job is done? If you notice something in the days or weeks after installation, who do you call? Is there a clear process for that, or does the answer get vague?
Companies that are straightforward to work with upfront tend to be the same ones that are easy to reach when you need something afterward.
Ready to Get Your Questions Answered?
Knowing the right questions to ask before a window replacement puts you in a better position to evaluate your options and choose a contractor you can trust. A good contractor will welcome the conversation.
Renewal by Andersen of offers free in-home consultations with no pressure and no obligation. Schedule yours and find out exactly what your home needs.
