Top-Rated Window Replacement Companies in Lower Merion, PA
Lower Merion's 10 listings below come from Google Maps rather than a state license file. IECC climate zone 4A sets the energy bar for a Lower Merion window job no matter which kind of list a contractor's name comes from. Checked September 2026.
Google Maps ratings checked · How we rank
4AIECC climate zone · ENERGY STAR North-Central zone
What Lower Merion's climate means for your window spec
Lower Merion sits in IECC climate zone 4A, the starting point for any code-minimum window performance here.
ENERGY STAR places Montgomery County in its North-Central zone for window certification.
Data: U.S. EPA / DOE, ENERGY STAR, ENERGY STAR Version 7.0 Climate Zones by County/ZIP (Windows, Doors, and Skylights) (V7.0); Pacific Northwest National Laboratory (DOE Building America), Guide to Determining Climate Zone by County: Building America and IECC 2021 Updates (PNNL-33270) (2021 IECC), from the nearest NOAA station 3.7 mi away.
10 top-rated window replacement companies in and near Lower Merion
Ranked by Google rating weighted against how many people left one, so a perfect score from a handful of reviewers never outranks a strong average built on hundreds. That ranking is not a license check; call the state directly and ask for the contractor's license or registration number.
| Rank | Business | Google rating | Reviews | Category | Area | Google Maps listing |
|---|---|---|---|---|---|---|
| 1 | Next Generation Windows & Doors | 264 | Window installation service | Newtown Square 19073 | Google reviews | |
| 2 | Thermal Quality Window & Door Company | 552 | Window installation service | Broomall 19008 | Google reviews | |
| 3 | Emerald Windows | 358 | Window installation service | Philadelphia 19133 | Google reviews | |
| 4 | O'Donnell Roofing Co. | 224 | Window installation service | Havertown 19083 | Google reviews | |
| 5 | Window World of Philadelphia | 19 | Window installation service | Upper Darby Township 19082 | Google reviews | |
| 6 | Marvin Design Gallery By Matus | 10 | Window installation service | Ardmore 19003 | Google reviews | |
| 7 | Havertown Window Replacement | 5 | Window installation service | Havertown 19083 | Google reviews | |
| 8 | Hynes Construction | 128 | Window installation service | Ardmore 19003 | Google reviews | |
| 9 | Wynnewood Roofing, Siding and Windows Company | 4 | Window installation service | Wynnewood 19096 | Google reviews | |
| 10 | Chestnut Hill Roofing, Siding and Windows Company | 5 | Window installation service | Not listed | Google reviews |
Questions to ask before you sign
- How long have you held your state license, and can I see the number?
- Is this a full-frame replacement or an insert into my existing frame, and why that one?
- Who pulls the permit, and does this change trigger an egress check on a bedroom window?
- What flashing and sill pan will you use, and in what order do you install them?
- If my home was built before 1978, is your crew lead-safe certified for this job?
- What's the completion date in writing, and what happens if the schedule slips?