690 window installers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
Best overall in Darnestown: Quality Window & Glass Repair LLC, CR Score 93/100; 5.0★ from 392 Google reviews; open 24/7.
Best for emergencies (open 24/7): Kennedy Locksmith, posts 24/7 hours; ranked #2 of 690.
Most-reviewed: Window Nation, 4,186 Google reviews at 4.7★, the most of 690 ranked; ranked #6.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
690 Darnestown window installers are ranked here by CR Score, from 8 published factors. 109 are open 24/7, 461 open Saturdays and 268 open Sundays, based on posted hours. The median Google rating is 4.8★ across 690 rated businesses.
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Quality Window & Glass Repair LLC | 93 | 5.0★ (392) | Germantown, 5 mi away | 24/7 | Overall |
| 2 | Kennedy Locksmith | 91 | 4.9★ (980) | Aspen Hill, 16 mi away | 24/7 | Emergencies |
| 3 | Safety Glass Repair | 90 | 5.0★ (165) | Gaithersburg, 9 mi away | 24/7 | — |
| 4 | Kennedy Glass in DC | 89 | 4.9★ (382) | Washington, D.C., 20 mi away | 24/7 | — |
| 5 | Renewal by Andersen of the Capital Region | 89 | 4.9★ (1,041) | North Bethesda, 11 mi away | Sat · Sun | — |
| 6 | Window Nation | 89 | 4.7★ (4,186) | Glen Burnie, 35 mi away | 24/7 | Most reviews |
| 7 | Auto Glass Experts | 88 | 5.0★ (50) | Aspen Hill, 5 mi away | 24/7 | — |
| 8 | Zen Windows Washington DC | 88 | 5.0★ (119) | Washington, D.C., 17 mi away | 24/7 | — |
| 9 | Rockville Auto Glass Replacement | 88 | 4.9★ (231) | Darnestown | Sat · Sun · Evenings | — |
| 10 | Lumina Glass & Windows | 87 | 5.0★ (107) | Washington, D.C., 20 mi away | 24/7 | — |
Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.
Ranked #1 because of its Google rating and availability: 5.0★ from 392 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Aspen Hill, 16 mi away
Ranked #2 because of its Google rating and availability: 4.9★ from 980 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Gaithersburg, 9 mi away
Ranked #3 because of its Google rating and availability: 5.0★ from 165 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Washington, D.C., 20 mi away
Ranked #4 because of its Google rating and availability: 4.9★ from 382 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in North Bethesda, 11 mi away
Ranked #5 because of its Google rating and trade focus: 4.9★ from 1,041 Google reviews, listed on Google as “Window installation service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Glen Burnie, 35 mi away
Ranked #6 because of its Google rating and review volume: 4.7★ from 4,186 Google reviews, the most Google reviews on this list (4,186).
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Aspen Hill, 5 mi away
Ranked #7 because of its Google rating and availability: 5.0★ from 50 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Washington, D.C., 17 mi away
Ranked #8 because of its Google rating and availability: 5.0★ from 119 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Darnestown
Ranked #9 because of its Google rating and trade focus: 4.9★ from 231 Google reviews, listed on Google as “Window installation service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Washington, D.C., 20 mi away
Ranked #10 because of its Google rating and availability: 5.0★ from 107 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Gaithersburg, 4 mi away
Ranked #11 because of its Google rating and availability: 4.8★ from 45 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Silver Spring, 16 mi away
Ranked #12 because of its Google rating and trade focus: 5.0★ from 416 Google reviews, listed on Google as “Window installation service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Washington, D.C., 22 mi away
Ranked #13 because of its Google rating and availability: 5.0★ from 101 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Fairfax, 16 mi away
Ranked #14 because of its Google rating and trade focus: 4.8★ from 669 Google reviews, listed on Google as “Window installation service”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Washington, D.C., 19 mi away
Ranked #15 because of its Google rating and availability: 4.8★ from 116 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Lorton, 26 mi away
Ranked #16 because of its Google rating and availability: 4.5★ from 1,235 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Alexandria, 22 mi away
Ranked #17 because of its Google rating and trade focus: 5.0★ from 372 Google reviews, listed on Google as “Window installation service”.
Based on 5 of 8 factors; credentials, recency and availability not yet collected.
Based in Arlington, 20 mi away
Ranked #18 because of its Google rating and availability: 4.9★ from 80 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Washington, D.C., 19 mi away
Ranked #19 because of its Google rating and availability: 4.9★ from 74 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Washington, D.C., 21 mi away
Ranked #20 because of its Google rating and availability: 4.9★ from 3,700 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Chantilly, 17 mi away
Ranked #21 because of its Google rating and availability: 4.9★ from 2,385 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Dale City, 31 mi away
Ranked #22 because of its Google rating and availability: 5.0★ from 115 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Merrifield, 12 mi away
Ranked #23 because of its Google rating and availability: 5.0★ from 24 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Darnestown
Ranked #24 because of its Google rating and trade focus: 4.9★ from 60 Google reviews, listed on Google as “Window installation service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
Based in Catonsville, 31 mi away
Ranked #25 because of its Google rating and availability: 5.0★ from 97 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
Typical prices in USD, adjusted for Maryland with a published regional index. Each row names its basis and month.
| Job | Low | Typical | High | Basis | Checked |
|---|---|---|---|---|---|
| Window replacement | $3,370 | $7,200 | $11,600 | Per project (several windows): typical range of customer-reported projects. US national range × 0.98 South Atlantic factor (2025 Cost vs. Value Report) | October 2026 |
We scored 690 Darnestown window installers on 8 factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. Unknown factors are left out of the score, not counted as zero. Scores last refreshed October 22, 2026.
Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In Darnestown data |
|---|---|---|---|
| Reputation | 35% | Bayesian-adjusted Google star rating | Measured |
| Credentials | 15% | Active state license 0.6, bond 0.2, workers’ comp 0.2 | Not yet collected |
| Review volume | 10% | log10(reviews + 1) against the list maximum | Measured |
| Recency | 10% | Share of reviews from the last 12 months | Not yet collected |
| Availability | 10% | Weekly open hours, Saturday, Sunday, 24/7 or same-day | Measured |
| Trade focus | 10% | Google main category 1.0, business name 0.7, additional category 0.5 | Measured |
| Proximity | 5% | 1.0 when based in the city, falling to 0 at the trade’s radius | Measured |
| Completeness | 5% | Website, photos, description, hours, claimed profile (0.2 each) | Measured |