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GroundworksGeneral contractor in Ontario, CA

Groundworks is a general contractor at 1850 S Parco Ave, Ontario, CA 91761, ranked #1 of 860 general contractors in Ontario and rated 4.9 from 135 Google reviews. Open 7 days a week.

Ontario, CAUpdated 0 paid placements in any rankingHow we rank

Call (909) 220-5664Website ↗

Key facts

Key facts about Groundworks
Address1850 S Parco Ave, Ontario, CA 91761Get directions
Phone(909) 220-5664
Websitegroundworks.com
HoursMonday to Friday: 4 AM – 8 PM; Saturday: 5 AM – 8 PM; Sunday: 7 AM – 8 PM
Google rating4.9 from 135 Google reviews

Trades

Each trade shows the evidence we matched it on.

Service area

Serves Ontario and 11 towns within 25 miles: Chino, Upland, Montclair, Rancho Cucamonga, Eastvale, Los Serranos, Claremont, Jurupa Valley, Pomona, Glen Avon and Chino Hills.

Based in Ontario, CAView on map

Opening hours

Opening hours for Groundworks
DayHours
Monday4 AM – 8 PMevening
Tuesday4 AM – 8 PMevening
Wednesday4 AM – 8 PMevening
Thursday4 AM – 8 PMevening
Friday4 AM – 8 PMevening
Saturday5 AM – 8 PMevening
Sunday7 AM – 8 PMevening
  • Open evenings (after 6 PM)
  • 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 × 1.04 Pacific factor (2025 Cost vs. Value Report)$15,240$28,190$43,470
Bathroom remodelPer bathroom: typical range of customer-reported remodels. US national range × 1.06 Pacific factor (2025 Cost vs. Value Report)$7,050$12,880$18,720

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

Compare nearby general contractors

Groundworks compared with nearby businesses
BusinessRankCR ScoreGoogle ratingLicense verifiedSaturdaySundayDistance away
Groundworks (this business)—614.9 (135)—YesYes
American West Home Inspection, Inc.#2605.0 (179)—YesYes12.8 mi
Closet World - Southern California#3604.7 (2,697)—YesYes24.0 mi

See all 860 ranked general contractors in Ontario

Reviews

ContractorsRanked reviews

No ContractorsRanked reviews yet

Google

4.9from 135 Google reviews

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Questions about Groundworks

How is Groundworks ranked in Ontario?

Groundworks is ranked #1 of 860 general contractors in Ontario by CR Score, with 61 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 Groundworks’ hours?

Groundworks is open 7 days a week. Its listed hours are Monday to Friday, 4 AM – 8 PM; Saturday, 5 AM – 8 PM; Sunday, 7 AM – 8 PM. On Saturdays it is open 5 AM to 8 PM, and on Sundays 7 AM to 8 PM. Hours come from the business listing; holiday hours may differ.

What areas does Groundworks serve?

Serves Ontario and 11 towns within 25 miles: Chino, Upland, Montclair, Rancho Cucamonga, Eastvale, Los Serranos, Claremont, Jurupa Valley, Pomona, Glen Avon and Chino Hills. 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 Groundworks?

Groundworks has a rating of 4.9 from 135 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 Groundworks?

Call Groundworks on (909) 220-5664. The business is at 1850 S Parco Ave, Ontario, CA 91761. Its website is linked in the key facts on this page. Ask for a written estimate before any work starts.

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