(416) 318-4202
Northstar Spray Foam and Insulation
Serving Markham, York Region · since 2009

Insulation & Fireproofing in Markham

Markham homeowners and builders trust Northstar for energy-saving spray foam, code-compliant fireproofing, and attic insulation upgrades. Local crews. Free quotes. 2-year warranty.

(416) 318-4202Get Markham Quote

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No-obligation, on-site assessment within 48 hours.

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Fully Insured
CUFCA Certified
2-Year Warranty
Same-Week Service
Local Service

Your Markham Insulation & Fireproofing Contractor

Markham is one of the GTA's most active markets for both new construction and high-end renovations. Northstar works with builders in Cornell, Berczy, and Cathedraltown, and serves mature Unionville and Thornhill homeowners upgrading 30+ year-old attics.

Markham customers know what they want and ask sharp questions — we welcome that. Every quote spells out foam type, thickness, R-value, board-feet, and the CCMC listing. No surprises, no upsell pressure.

Neighbourhoods We Serve in Markham

UnionvilleCornellBerczy VillageCathedraltownMarkvilleWismerBox GroveMilliken Mills
Local building stock

New-build subdivisions, 1990s executive housing, and heritage homes along Main Street Unionville.

Markham tip

Markham's deeper-than-average frost line means basement-wall spray foam should extend full-height to the slab, not just the rim.

Recent Markham project

Attic spray foam and cathedral-ceiling retrofit on a 1991 Unionville home — eliminated ice damming after a single winter.

Core Services in Markham

Spray Foam Insulationin Markham Commercial Fireproofingin Markham Attic Insulationblown-in to R-60

More Services Offered in Markham

Spray Foam Insulation
in Markham
Commercial Fireproofing
in Markham
Attic Blown-In Insulation
in Markham
Fibreglass Batt Insulation
in Markham
Insulation Removal
in Markham
Residential Insulation
in Markham

Why Markham Homeowners Choose Spray Foam

Ontario winters lose homes huge energy through gaps spray foam seals
Up to R-7 per inch — the highest practical R-value available
Eliminates ice damming on Markham roofs
Cuts heating & cooling bills 30–50%
Improves indoor comfort year-round in Markham
Adds structural rigidity to walls and roofs
Residential insulation Markham

Residential in Markham

Attics, basements, walls, garages, and crawl spaces. Free quotes for Markham homeowners.

Residential services
Commercial insulation Markham

Commercial in Markham

Offices, condos, retail, and industrial buildings. Tender-ready bids, WSIB coverage, on-time inspections.

Commercial services
Customer Stories

What GTA Homeowners & Builders Say

"Northstar spray-foamed our basement and rim joists. The cold spots are gone and our gas bill dropped 35%. Crew was on time and spotless."

Sarah M.
Mississauga

"Hired them for fireproofing on a 6-storey build. Hit every inspection and stayed ahead of schedule. We've already booked them for the next project."

David L.
Vaughan

"Removed nasty old attic insulation full of rodent damage and topped us up to R-60 in one day. Highly recommend."

Priya K.
Oakville

"Got three quotes — Northstar wasn't the cheapest but the most professional by a mile. Quality of work was excellent."

Mark T.
Toronto
FAQ

Markham Insulation FAQ

Yes — Northstar provides open and closed-cell spray foam insulation throughout Markham and the surrounding area, for both residential and commercial projects.

Get your free Markham quote today

Call (416) 318-4202 or request online — same-week service available.

Call (416) 318-4202Get Free Quote