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Best Siding Contractors in Longmont, CO (2026)

355 siding contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →

The short answer

  1. 1

    Best overall in Longmont: WestPro Home Exteriors, CR Score 63/100; 4.9★ from 715 Google reviews; open Saturdays until 7 PM.

  2. 2

    Best for emergencies (open 24/7): Glassford Project Management, posts 24/7 hours; ranked #2 of 355.

  3. 20

    Most-reviewed: DaBella, 2,034 Google reviews at 4.4★, the most of 355 ranked; ranked #20.

Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank

355 Longmont siding contractors are ranked here by CR Score, from ten published factors. 42 are open 24/7, 219 open Saturdays and 97 open Sundays, based on posted hours. The median Google rating is 4.8★ across 355 rated businesses.

Top 10 siding contractors in Longmont at a glance

Top 10 siding contractors in Longmont at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1WestPro Home Exteriors634.9★ (715)LongmontSat · EveningsOverall
2Glassford Project Management625.0★ (45)Longmont24/7Emergencies
31-800-HANSONS614.7★ (808)Commerce City, 28 mi away24/7—
4Northern Lights Exteriors594.8★ (399)Fort Lupton, 13 mi awaySat—
5Aloha State Builders, Inc.585.0★ (76)Lakewood, 30 mi away24/7—
6Ace Handyman Services Aurora584.9★ (143)Aurora, 37 mi away24/7—
7Siding Design Pro & SDP Renovation585.0★ (33)LongmontSat—
8Orus Painting Solutions585.0★ (132)Cherry Hills Village, 30 mi awaySat · Sun—
9Wood Street Builders584.7★ (43)Loveland, 20 mi away24/7—
10Elite Custom Painting & Remodel585.0★ (245)Fort Collins, 26 mi awaySat—

The 355 best siding contractors in Longmont, ranked

Ordered by CR Score, a 0–100 score from ten published factors. Paid placement never changes the order.

Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.

  1. Ranked #1 in Longmont

    #1 WestPro Home Exteriors

    Based in Longmont

    63/100CR Score

    Ranked #1 because of its Google rating and trade focus: 4.9★ from 715 Google reviews, listed on Google as “Siding contractor”.

    • 4.9★ from 715 Google reviews
    Hours
    Mon–Sat 8 AM–7 PM · Sun closed
    Address
    164 Primrose Ct, Longmont, CO 80501
    View profile for WestPro Home Exteriors(303) 834-9236

  3. #3 1-800-HANSONS

    Based in Commerce City, 28 mi away

    61/100CR Score

    Ranked #3 because of its Google rating and trade focus: 4.7★ from 808 Google reviews, listed on Google as “Siding contractor”.

    • 4.7★ from 808 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    6731 E 50th Ave a, Commerce City, CO 80022
    View profile for 1-800-HANSONS(720) 330-4061

  9. #9 Wood Street Builders

    Based in Loveland, 20 mi away

    58/100CR Score

    Ranked #9 because of its Google rating and trade focus: 4.7★ from 43 Google reviews, listed on Google as “Siding contractor”.

    • 4.7★ from 43 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    6784 N Franklin Ave, Loveland, CO 80538
    View profile for Wood Street Builders(970) 619-8019

  11. #11 Vivax Pros

    Based in Loveland, 16 mi away

    57/100CR Score

    Ranked #11 because of its Google rating and trade focus: 4.6★ from 285 Google reviews, listed on Google as “Siding contractor”.

    • 4.6★ from 285 Google reviews
    Hours
    Mon–Thu 8 AM–6 PM · Fri 8 AM–5 PM · Sat 10 AM–4 PM · Sun closed
    Address
    201 E 4th St, Loveland, CO 80537
    View profile for Vivax Pros(970) 988-8578

  12. #12 GS Exterior Experts

    Based in Littleton, 39 mi away

    57/100CR Score

    Ranked #12 because of its Google rating and trade focus: 4.9★ from 303 Google reviews, listed on Google as “Siding contractor”.

    • 4.9★ from 303 Google reviews
    Hours
    Mon–Sun 7 AM–8 PM
    Address
    9083 W Peakview Dr #2, Littleton, CO 80123
    View profile for GS Exterior Experts(720) 683-6288

  15. #15 MSSV Construction

    Based in Denver, 29 mi away

    57/100CR Score

    Ranked #15 because of its Google rating and trade focus: 5.0★ from 74 Google reviews, listed on Google as “Siding contractor”.

    • 5.0★ from 74 Google reviews
    Hours
    Mon 5 AM–5 PM · Tue–Wed 5 AM–7 PM · Thu–Fri 5 AM–6 PM · Sat 5 AM–7 PM · Sun 6 AM–7 PM
    Address
    1801 Wewatta St Floor 11 #14, Denver, CO 80202
    View profile for MSSV Construction(303) 800-8206

  20. #20 DaBella

    Based in Denver, 37 mi away

    56/100CR Score

    Ranked #20 because of its Google rating and review volume: 4.4★ from 2,034 Google reviews, the most in Longmont.

    • 4.4★ from 2,034 Google reviews
    Hours
    Mon–Fri 7 AM–9 PM · Sat 8 AM–5 PM · Sun closed
    Address
    6600 E Hampden Ave, Denver, CO 80224
    View profile for DaBella(720) 619-8704

  21. #21 KCJC Painting

    Based in Broomfield, 23 mi away

    56/100CR Score

    Ranked #21 because of its Google rating and trade focus: 5.0★ from 38 Google reviews, listed on Google as “Siding contractor”.

    • 5.0★ from 38 Google reviews
    Hours
    Mon–Sun 8 AM–5:30 PM
    View profile for KCJC Painting

  22. #22 All Exterior Solutions

    Based in Denver, 24 mi away

    56/100CR Score

    Ranked #22 because of its Google rating and trade focus: 4.9★ from 127 Google reviews, listed on Google as “Siding contractor”.

    • 4.9★ from 127 Google reviews
    Hours
    Mon–Sat 8 AM–5 PM · Sun closed
    Address
    Building 3, 7100 Broadway unit 3-N, Denver, CO 80221
    View profile for All Exterior Solutions(720) 255-3029

  24. #24 Ideal Siding Boulder

    Based in Boulder, 12 mi away

    56/100CR Score

    Ranked #24 because of its Google rating and trade focus: 4.9★ from 40 Google reviews, listed on Google as “Siding contractor”.

    • 4.9★ from 40 Google reviews
    Hours
    Mon–Sat 8 AM–6 PM · Sun closed
    Address
    2593 Kalmia Ave, Boulder, CO 80304
    View profile for Ideal Siding Boulder(720) 677-8734

Siding contractors ranked #26 to #50

#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile. We publish the top 50 of 355 ranked siding contractors here; the rest are on their profiles.

siding contractors in Longmont, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26Storm Guard Roofing of North Metro Denver565.0★ (202)16 mi
27JKP Pros Painting Plus, LLC565.0★ (85)36 mi
283model Construction, LLC564.6★ (18)In Longmont
29Blue Spruce Construction Group564.9★ (118)8 mi
30KELLY CONSTRUCTION564.9★ (57)19 mi
31Lifetime Home Remodeling Denver (Windows, Siding, Bath)564.6★ (1,327)30 mi
32Carlson Siding & Construction564.7★ (27)19 mi
33Blue Ox Exteriors554.7★ (127)34 mi
34Harpel Builders & Restoration555.0★ (90)28 mi
35Mountain Safe Exteriors - Siding & Window Service555.0★ (187)39 mi
36Pioneer Home Solutions554.7★ (118)26 mi
376S Construction555.0★ (7)21 mi
38Paramount Siding & Windows554.9★ (668)40 mi
39QUALITY EXTERIORS554.9★ (68)15 mi
40Echelon Exteriors555.0★ (18)34 mi
41Roper Roofing & Solar544.9★ (266)26 mi
42The Install Company545.0★ (38)26 mi
43Eagle Crest Construction544.7★ (14)20 mi
44Refined Exteriors544.8★ (59)27 mi
45Bellwether Windows, Siding, & Doors544.8★ (236)29 mi
46Road Home Exteriors545.0★ (110)28 mi
47Safe Plus Roofing545.0★ (44)In Longmont
48Denver Siding Co.545.0★ (91)27 mi
49Colorado Superior Roofing & Exteriors544.8★ (59)In Longmont
50Kraftwork Design Windows & Siding544.8★ (70)32 mi

Also serving Longmont

20 more siding contractors within 40 mi that we can't rank yet: too few reviews, or a trade we couldn't confirm. Listed A to Z.

Unranked siding contractors serving Longmont
BusinessGoogle ratingDistance
Ace of Diamonds Painting4.9★ (153)In Longmont
Atrium Painting5.0★ (21)In Longmont
B's Builders & Roofing4.8★ (20)In Longmont
Baker Builders4.6★ (45)In Longmont
BlueBird Windows & Doors4.9★ (624)In Longmont
Bulldog Roofing4.9★ (572)In Longmont
CertaPro Painters® of Boulder and Longmont4.9★ (121)In Longmont
Drywall Repair Installation of Longmont4.9★ (14)In Longmont
EcoShield Pest Solutions4.7★ (4,537)In Longmont
Five Star Painting of Longmont4.9★ (175)In Longmont
Haan Solo LLC5.0★ (35)In Longmont
HighPoint Painting5.0★ (18)In Longmont
Kaleb & Sons Roof Leak Detection4.7★ (43)In Longmont
Legacy Roofers LLC5.0★ (61)In Longmont
Project One Roofing4.9★ (29)In Longmont
River City Roofing4.9★ (36)In Longmont
Spectrum Plastering5.0★ (17)In Longmont
Steel Structures America4.0★ (37)In Longmont
Tellez Concrete and Design LLC.4.9★ (61)In Longmont
The Insulation Guys4.8★ (23)In Longmont

How much do siding contractors cost in Longmont?

Typical prices in USD, adjusted for Colorado with a published regional index. Each row names its basis and month.

How much do siding contractors cost in Longmont?
JobLowTypicalHighBasisChecked
Siding replacement$5,260$10,960$16,770Per house: typical range of customer-reported projects. US national range × 0.95 Mountain factor (2025 Cost vs. Value Report)October 2026

How we ranked Longmont siding contractors

We scored 355 Longmont siding contractors on ten 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. A business with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, 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.

Read the full method: formula, sources and exclusions

CR Score factors and weights
FactorWeightComputed fromIn Longmont data
Reputation25%Google star rating, adjusted for how many reviews back itMeasured
Credentials15%Active state license, bond and workers’ comp on fileNot yet collected
Review volume10%Number of Google reviews, compared with the most-reviewed business on the listMeasured
Recency5%Share of reviews from the last 12 monthsNot yet collected
Availability5%Weekly open hours, Saturday, Sunday, 24/7 or same-dayMeasured
Trade focus10%How clearly the business does this trade (its Google category and name)Measured
Proximity5%Based in the city scores highest, less the farther away it isMeasured
Claimed profile10%The business has claimed its ContractorsRanked profile (free or paid earn the same)Measured
Partnered5%The business links to ContractorsRanked from its own website with our badge, checked periodicallyMeasured
ContractorsRanked reviews10%Verified customer reviews collected by ContractorsRanked: their rating and how many there areMeasured

Siding contractors in Longmont: frequently asked questions

Who is the best siding contractor in Longmont?

By CR Score, the highest-ranked siding contractor in Longmont, CO is WestPro Home Exteriors with a CR Score of 63/100. It has 4.9★ from 715 Google reviews. It is open Saturdays until 7 PM. Glassford Project Management (#2) and 1-800-HANSONS (#3) follow. We ranked 355 siding contractors on ten factors, last updated October 22, 2026.

How many siding contractors are there in Longmont?

ContractorsRanked ranks 355 siding contractors serving Longmont, CO. 7 of them are based in Longmont; the rest serve it from nearby towns. Another 20 within 40 mi are listed but not ranked yet. Counts are as of October 2026.

Which siding contractors in Longmont are open 24/7?

42 ranked siding contractors in Longmont post 24/7 hours. The highest-ranked are Glassford Project Management (#2), 1-800-HANSONS (#3) and Aloha State Builders, Inc. (#5). Hours come from each business's Google listing as of October 2026, so call to confirm.

Which siding contractors in Longmont work on weekends?

219 of 355 ranked siding contractors post Saturday hours and 97 post Sunday hours. The highest-ranked open Saturdays are WestPro Home Exteriors (#1), Glassford Project Management (#2) and 1-800-HANSONS (#3). Posted hours are office hours; crews may book weekend jobs separately.

How much does siding replacement cost in Longmont?

Siding replacement typically costs $5,260 to $16,770, with $10,960 typical (Per house: typical range of customer-reported projects. US national range × 0.95 Mountain factor (2025 Cost vs. Value Report)). The range is adjusted for Colorado. Prices were last checked October 2026. Get at least two written quotes before you hire.

What Google rating do Longmont siding contractors have?

The median Google rating among 355 rated siding contractors in Longmont is 4.8★, with a median of 37 reviews. DaBella has the most, 2,034 reviews, and ranks #20. We adjust ratings for review count, so a few five-star reviews cannot top the list.

How does ContractorsRanked rank siding contractors?

Each siding contractor gets a 0–100 CR Score from ten published factors, led by reputation (25%), credentials (15%), review volume (10%) and trade focus (10%). A business with no Google reviews scores zero on rating, review volume and recency; other factors we cannot measure are left out. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.

Do siding contractors outside Longmont count in this ranking?

Yes, if they are within 40 mi of the Longmont city center, our service radius for siding contractors. 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.

Update log for Longmont

  1. October 2026: CR Scores recalculated for 355 siding contractors serving Longmont.
  2. October 2026: 4 duplicate listings merged.

More siding contractors and Longmont pages

Other trades in Longmont