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Cosman ConstructionGeneral contractor in Boulder, CO

Cosman Construction is a general contractor at 3401 Arapahoe Ave STE 303, Boulder, CO 80303, ranked #3 of 456 general contractors in Boulder and rated 4.7 from 33 Google reviews. Open 7 days a week.

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Call (303) 775-6690Website ↗

Key facts

Key facts about Cosman Construction
Address3401 Arapahoe Ave STE 303, Boulder, CO 80303Get directions
Phone(303) 775-6690
Websitecosmanconstruction.com
HoursMonday to Friday: 8 AM – 6 PM; Saturday and Sunday: 9 AM – 5 PM
Google rating4.7 from 33 Google reviews

Trades

Each trade shows the evidence we matched it on.

Service area

Serves Boulder and 11 towns within 25 miles: Gunbarrel, Superior, Louisville, Lafayette, Erie, Broomfield, Longmont, Shaw Heights, Northglenn, Westminster and Arvada.

Based in Boulder, COView on map

Opening hours

Opening hours for Cosman Construction
DayHours
Monday8 AM – 6 PM
Tuesday8 AM – 6 PM
Wednesday8 AM – 6 PM
Thursday8 AM – 6 PM
Friday8 AM – 6 PM
Saturday9 AM – 5 PM
Sunday9 AM – 5 PM
  • Open evenings — no
  • Open Saturdays
  • Open Sundays

Typical general contracting prices

Typical general contracting prices
JobLowTypicalHigh
Kitchen remodelPer project: typical range of customer-reported remodels (about $75 to $250 per sq ft). US national range × 1.00 Mountain factor (2025 Cost vs. Value Report)$14,610$27,020$41,660
Bathroom remodelPer bathroom: typical range of customer-reported remodels. US national range × 0.95 Mountain factor (2025 Cost vs. Value Report)$6,340$11,590$16,840

Market ranges for the trade, checked October 2026, not a quote from this business. Ask for a written estimate.

Compare nearby general contractors

Cosman Construction compared with nearby businesses
BusinessRankCR ScoreGoogle ratingLicense verifiedSaturdaySundayDistance away
Cosman Construction (this business)—594.7 (33)—YesYes
Mile High Radon Control#1615.0 (144)—YesYes11.5 mi
Radon Safety LLC#2604.9 (668)—YesNo20.8 mi
K&H Home Solutions#4594.8 (551)—YesNo18.2 mi

See all 456 ranked general contractors in Boulder

Reviews

ContractorsRanked reviews

No ContractorsRanked reviews yet

Google

4.7from 33 Google reviews

Hired Cosman Construction? Write a review

Questions about Cosman Construction

How is Cosman Construction ranked in Boulder?

Cosman Construction is ranked #3 of 456 general contractors in Boulder by CR Score, with 59 out of 100 as of October 2026. The score weighs reputation, credentials, review volume, recency, availability, trade focus, proximity, claimed profile, partnered and ContractorsRanked reviews. No business can pay to change its rank.

What are Cosman Construction’s hours?

Cosman Construction is open 7 days a week. Its listed hours are Monday to Friday, 8 AM – 6 PM; Saturday and Sunday, 9 AM – 5 PM. On Saturdays it is open 9 AM to 5 PM, and on Sundays 9 AM to 5 PM. Hours come from the business listing; holiday hours may differ.

What areas does Cosman Construction serve?

Serves Boulder and 11 towns within 25 miles: Gunbarrel, Superior, Louisville, Lafayette, Erie, Broomfield, Longmont, Shaw Heights, Northglenn, Westminster and Arvada. The list is based on the business's location and the usual service radius for general contracting. Confirm your address is covered when you call.

What do Google reviews say about Cosman Construction?

Cosman Construction has a rating of 4.7 from 33 Google reviews. The CR Score adjusts the star rating for review count, so a high rating from a few reviews counts for less than the same rating from many.

How do I contact Cosman Construction?

Call Cosman Construction on (303) 775-6690. The business is at 3401 Arapahoe Ave STE 303, Boulder, CO 80303. Its website is linked in the key facts on this page. Ask for a written estimate before any work starts.

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