92/100CR Score
Ranked #1 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.
- 4.9★ from 980 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Best Window Installers in Rockville, MD (2026)
734 window installers ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in Rockville: Kennedy Locksmith, CR Score 92/100; 4.9★ from 980 Google reviews; open 24/7.
- 2
Best for emergencies (open 24/7): Quality Window & Glass Repair LLC, posts 24/7 hours; ranked #2 of 734.
- 6
Most-reviewed: Window Nation, 4,186 Google reviews at 4.7★, the most of 734 ranked; ranked #6.
Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank
734 Rockville window installers are ranked here by CR Score, from 8 published factors. 117 are open 24/7, 493 open Saturdays and 285 open Sundays, based on posted hours. The median Google rating is 4.8★ across 734 rated businesses.
Most of this list also appears on the Window installers in Germantown ranking. See Window installers in Germantown
Top 10 window installers in Rockville at a glance
| Rank | Business | CR Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Kennedy Locksmith | 92 | 4.9★ (980) | Aspen Hill, 10 mi away | 24/7 | Overall |
| 2 | Quality Window & Glass Repair LLC | 92 | 5.0★ (392) | Germantown, 9 mi away | 24/7 | Emergencies |
| 3 | Safety Glass Repair | 91 | 5.0★ (165) | Gaithersburg, 7 mi away | 24/7 | — |
| 4 | Kennedy Glass in DC | 90 | 4.9★ (382) | Washington, D.C., 14 mi away | 24/7 | — |
| 5 | Renewal by Andersen of the Capital Region | 90 | 4.9★ (1,041) | North Bethesda, 4 mi away | Sat · Sun | — |
| 6 | Window Nation | 90 | 4.7★ (4,186) | Glen Burnie, 28 mi away | 24/7 | Most reviews |
| 7 | Zen Windows Washington DC | 89 | 5.0★ (119) | Washington, D.C., 10 mi away | 24/7 | — |
| 8 | KELEMER BROTHERS REPLACEMENT WINDOWS | 89 | 5.0★ (416) | Silver Spring, 9 mi away | Sat · Sun · Evenings | — |
| 9 | Auto Glass Experts | 88 | 5.0★ (50) | Aspen Hill, 5 mi away | 24/7 | — |
| 10 | Lumina Glass & Windows | 88 | 5.0★ (107) | Washington, D.C., 15 mi away | 24/7 | — |
The 734 best window installers in Rockville, ranked
Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.
Based in Germantown, 9 mi away
92/100CR ScoreRanked #2 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.
- 5.0★ from 392 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 19006 Perrone Dr, Germantown, MD 20874
Based in Gaithersburg, 7 mi away
91/100CR ScoreRanked #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.
- 5.0★ from 165 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 20032 Mattingly Terrace, Gaithersburg, MD 20879
Based in Washington, D.C., 14 mi away
90/100CR ScoreRanked #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.
- 4.9★ from 382 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 901 R St NW, Washington, DC 20001
Based in North Bethesda, 4 mi away
90/100CR ScoreRanked #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.
- 4.9★ from 1,041 Google reviews
- Hours
- Mon–Sun 10 AM–6 PM
- Address
- 5081 Nicholson Ln, North Bethesda, MD 20852
Based in Glen Burnie, 28 mi away
90/100CR ScoreRanked #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.
- 4.7★ from 4,186 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 871 Cromwell Park Dr, Glen Burnie, MD 21061
Based in Washington, D.C., 10 mi away
89/100CR ScoreRanked #7 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.
- 5.0★ from 119 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Silver Spring, 9 mi away
89/100CR ScoreRanked #8 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.
- 5.0★ from 416 Google reviews
- Hours
- Mon–Sun 7 AM–8 PM
- Address
- 10822 Childs Ct, Silver Spring, MD 20901
Based in Aspen Hill, 5 mi away
88/100CR ScoreRanked #9 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.
- 5.0★ from 50 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Washington, D.C., 15 mi away
88/100CR ScoreRanked #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.
- 5.0★ from 107 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1101 Pennsylvania Ave NW, Washington, DC 20004
Based in Washington, D.C., 17 mi away
88/100CR ScoreRanked #11 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.
- 5.0★ from 101 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1235 Pennsylvania Ave. SE, Washington, DC 20003
Based in Darnestown, 2 mi away
88/100CR ScoreRanked #12 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.
- 4.9★ from 231 Google reviews
- Hours
- Mon–Fri 8 AM–8 PM · Sat 9:30 AM–4:30 PM · Sun 10 AM–3 PM
Based in Washington, D.C., 13 mi away
87/100CR ScoreRanked #13 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.
- 4.8★ from 116 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1535 17th St NW Ste 200, Washington, DC 20036
Based in Washington, D.C., 14 mi away
87/100CR ScoreRanked #14 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.
- 4.9★ from 3,700 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 11820 W Market Pl Ste f, Fulton, MD 20759
#15 Pro Glass Repair
Based in Washington, D.C., 14 mi away
87/100CR ScoreRanked #15 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.
- 4.9★ from 74 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 2425 L St NW, Washington, DC 20037
Based in Arlington, 16 mi away
87/100CR ScoreRanked #16 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.
- 4.9★ from 80 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 1850 Columbia Pike, Arlington, VA 22204
Based in Gaithersburg, 7 mi away
87/100CR ScoreRanked #17 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.
- 4.8★ from 45 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 17729 Stoneridge Dr, Gaithersburg, MD 20878
Based in Alexandria, 19 mi away
87/100CR ScoreRanked #18 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.
- 5.0★ from 372 Google reviews
- Address
- 244 S Reynolds St, Alexandria, VA 22304
Based in Fairfax, 15 mi away
87/100CR ScoreRanked #19 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.
- 4.8★ from 669 Google reviews
- Address
- 2814 Merrilee Dr A, Fairfax, VA 22031
#20 Window Nation
Based in Lorton, 24 mi away
87/100CR ScoreRanked #20 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.
- 4.5★ from 1,235 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 8198 Terminal Rd #105, Lorton, VA 22079
Based in College Park, 12 mi away
87/100CR ScoreRanked #21 because of its Google rating and availability: 4.8★ from 159 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
- 4.8★ from 159 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 9320 Cherry Hill Rd, College Park, MD 20740
Based in Catonsville, 24 mi away
87/100CR ScoreRanked #22 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.
- 5.0★ from 97 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
Based in Dale City, 30 mi away
86/100CR ScoreRanked #23 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.
- 5.0★ from 115 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 13709 Lynn St, Woodbridge, VA 22191
Based in Falls Church, 15 mi away
86/100CR ScoreRanked #24 because of its Google rating and availability: 4.8★ from 50 Google reviews, open 24/7.
Based on 6 of 8 factors; credentials and recency not yet collected.
- 4.8★ from 50 Google reviews
- Open 24/7
- Hours
- Open 24 hours, 7 days
- Address
- 6533, 2035 Arlington Blvd Suite A 2035, A, Falls Church, VA 22042
Based in Lanham, 19 mi away
86/100CR ScoreRanked #25 because of its Google rating and trade focus: 4.5★ from 3,143 Google reviews, listed on Google as “Window installation service”.
Based on 6 of 8 factors; credentials and recency not yet collected.
- 4.5★ from 3,143 Google reviews
- Hours
- Mon–Fri 8 AM–7 PM · Sat 8 AM–5 PM · Sun 9 AM–5 PM
- Address
- 4200 Parliament Pl #600, Lanham, MD 20706
How much do window installers cost in Rockville?
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 |
How we ranked Rockville window installers
We scored 734 Rockville 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 Rockville 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 |
Window installers in Rockville: frequently asked questions
Who is the best window installer in Rockville?
By CR Score, the highest-ranked window installer in Rockville, MD is Kennedy Locksmith with a CR Score of 92/100. It has 4.9★ from 980 Google reviews. It is open 24/7. Quality Window & Glass Repair LLC (#2) and Safety Glass Repair (#3) follow. We ranked 734 window installers on 8 factors, last updated October 22, 2026.
Which window installers in Rockville are open 24/7?
117 ranked window installers in Rockville post 24/7 hours. The highest-ranked are Kennedy Locksmith (#1), Quality Window & Glass Repair LLC (#2) and Safety Glass Repair (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.
Which window installers in Rockville work on weekends?
493 of 734 ranked window installers post Saturday hours and 285 post Sunday hours. The highest-ranked open Saturdays are Kennedy Locksmith (#1), Quality Window & Glass Repair LLC (#2) and Safety Glass Repair (#3). Posted hours are office hours; crews may book weekend jobs separately.
How much does window replacement cost in Rockville?
Window replacement typically costs $3,370 to $11,600, with $7,200 typical (Per project (several windows): typical range of customer-reported projects. US national range × 0.98 South Atlantic factor (2025 Cost vs. Value Report)). The range is adjusted for Maryland. Prices were last checked October 2026. Get at least two written quotes before you hire.
What Google rating do Rockville window installers have?
The median Google rating among 734 rated window installers in Rockville is 4.8★, with a median of 32 reviews. Window Nation has the most, 4,186 reviews, and ranks #6. We adjust ratings for review count, so a few five-star reviews cannot top the list.
How does ContractorsRanked rank window installers?
Each window installer gets a 0–100 CR Score from 8 published factors, led by reputation (35%), credentials (15%), review volume (10%) and recency (10%). Factors we cannot measure are left out, not scored as zero. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.
Do window installers outside Rockville count in this ranking?
Yes, if they are within 40 mi of the Rockville city center, our service radius for window installers. Each listing shows where the business is based and how far away it is. Proximity is 5% of the CR Score, so a nearby business gets a small edge.
Can window installers pay to rank higher on ContractorsRanked?
No. The CR Score never reads payment status, and this ranking has 0 paid placements. Up to 3 Featured businesses may appear above the list, labelled Featured and showing their honest rank.
Update log for Rockville
- October 2026: CR Scores recalculated for 734 window installers serving Rockville.
- October 2026: 3 duplicate listings merged.
More window installers and Rockville pages
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