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Great Northern InsulationInsulation contractor in Oshawa, ON

Great Northern Insulation is an insulation contractor at 103 N Port Rd, Port Perry, ON L9L 0B7, ranked #6 of 45 insulation contractors in Oshawa and rated 4.5 from 112 Google reviews. Open Monday to Friday.

Oshawa, ONUpdated 0 paid placements in any rankingHow we rank

Call (800) 265-1914Website ↗

Key facts

Key facts about Great Northern Insulation
Address103 N Port Rd, Port Perry, ON L9L 0B7, Oshawa, ONGet directions
Phone(800) 265-1914
Websitegni.ca
HoursMonday to Friday: 7:30 AM – 5 PM
Google rating4.5 from 112 Google reviews

Trades

Each trade shows the evidence we matched it on.

Service area

Serves Oshawa and 7 towns within 40 km: Uxbridge, Pickering, Ajax, Lindsay, Markham, East Gwillimbury and Newmarket.

Based in Oshawa, ONView on map

Opening hours

Opening hours for Great Northern Insulation
DayHours
Monday7:30 AM – 5 PM
Tuesday7:30 AM – 5 PM
Wednesday7:30 AM – 5 PM
Thursday7:30 AM – 5 PM
Friday7:30 AM – 5 PM
SaturdayClosed
SundayClosed
  • Open evenings — no
  • Open Saturdays — no
  • Open Sundays — no

Typical insulation prices

Typical insulation prices
JobLowTypicalHigh
Attic insulationPer attic: typical range of customer-reported jobs (about $1 to $3 per sq ft). US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026)CA$2,390CA$2,950CA$3,510

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

Compare nearby insulation contractors

Great Northern Insulation compared with nearby businesses
BusinessRankCR ScoreGoogle ratingLicense verifiedSaturdaySundayDistance away
Great Northern Insulation (this business)—594.5 (112)—NoNo
Koala Insulation of Durham#4605.0 (11)—YesYes28.3 km
The Spray Foam Guy Inc.#5594.5 (19)—YesYes28.4 km
Logik Roofing & Insulation Whitby#7575.0 (9)—YesYes26.2 km

See all 45 ranked insulation contractors in Oshawa

Reviews

ContractorsRanked reviews

No ContractorsRanked reviews yet

Google

4.5from 112 Google reviews

Hired Great Northern Insulation? Write a review

Questions about Great Northern Insulation

How is Great Northern Insulation ranked in Oshawa?

Great Northern Insulation is ranked #6 of 45 insulation contractors in Oshawa 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 Great Northern Insulation’s hours?

Great Northern Insulation is open Monday to Friday. Its listed hours are Monday to Friday, 7:30 AM – 5 PM. It is closed on Saturdays and closed on Sundays. Hours come from the business listing; holiday hours may differ.

What areas does Great Northern Insulation serve?

Serves Oshawa and 7 towns within 40 km: Uxbridge, Pickering, Ajax, Lindsay, Markham, East Gwillimbury and Newmarket. The list is based on the business's location and the usual service radius for insulation. Confirm your address is covered when you call.

What do Google reviews say about Great Northern Insulation?

Great Northern Insulation has a rating of 4.5 from 112 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 Great Northern Insulation?

Call Great Northern Insulation on (800) 265-1914. The business is at 103 N Port Rd, Port Perry, ON L9L 0B7, Oshawa, ON. Its website is linked in the key facts on this page. Ask for a written estimate before any work starts.

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