Cornerstone ConstructionGeneral contractor in Oshawa, ON
Cornerstone Construction is a general contractor at 804 Ritson Rd S rear unit, Oshawa, ON L1H 5L4, rated 4.6 from 20 Google reviews. Open Monday to Friday.
Oshawa, ON0 paid placements in any rankingHow we rank
Key facts
| Address | 804 Ritson Rd S rear unit, Oshawa, ON L1H 5L4Get directions |
|---|---|
| Phone | (647) 521-7383 |
| Website | cornerstoneconstruction-inc.com |
| Hours | Monday to Thursday: 8 AM – 5 PM; Friday: 8 AM – 4 PM |
| Google rating | 4.6 from 20 Google reviews |
Trades
Each trade shows the evidence we matched it on.
- General Contractingmain tradeGoogle main category
- Kitchen Remodeladditional Google category
- Bathroom Remodeladditional Google category
- Flooringadditional Google category
Service area
Serves Oshawa and 6 towns within 40 km: Ajax, Pickering, Uxbridge, Markham, Scarborough and Port Hope.
Based in Oshawa, ONView on map
Opening hours
| Day | Hours |
|---|---|
| Monday | 8 AM – 5 PM |
| Tuesday | 8 AM – 5 PM |
| Wednesday | 8 AM – 5 PM |
| Thursday | 8 AM – 5 PM |
| Friday | 8 AM – 4 PM |
| Saturday | Closed |
| Sunday | Closed |
- Open evenings — no
- Open Saturdays — no
- Open Sundays — no
Typical general contracting prices
| Job | Low | Typical | High |
|---|---|---|---|
| Kitchen remodelPer project: typical range of customer-reported remodels (about $75 to $250 per sq ft). US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026) | CA$20,510 | CA$37,930 | CA$58,490 |
| Bathroom remodelPer bathroom: typical range of customer-reported remodels. US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026) | CA$9,350 | CA$17,080 | CA$24,820 |
Market ranges for the trade, checked October 2026, not a quote from this business. Ask for a written estimate.
Questions about Cornerstone Construction
What are Cornerstone Construction’s hours?
Cornerstone Construction is open Monday to Friday. Its listed hours are Monday to Thursday, 8 AM – 5 PM; Friday, 8 AM – 4 PM. It is closed on Saturdays and closed on Sundays. Hours come from the business listing; holiday hours may differ.
What areas does Cornerstone Construction serve?
Serves Oshawa and 6 towns within 40 km: Ajax, Pickering, Uxbridge, Markham, Scarborough and Port Hope. 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 Cornerstone Construction?
Cornerstone Construction has a rating of 4.6 from 20 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 Cornerstone Construction?
Call Cornerstone Construction on (647) 521-7383. The business is at 804 Ritson Rd S rear unit, Oshawa, ON L1H 5L4. Its website is linked in the key facts on this page. Ask for a written estimate before any work starts.
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