Next-day estimate · City of Markham

Basement Underpinning in Markham

Unionville's heritage homes, Cathedraltown's 2000s detached builds, and Cornell's new-urbanist stock each have different basement profiles - and York Region plan review runs 4-6 weeks through the City of Markham building department, faster than Toronto core. Toronto Basement Underpinning delivers basement underpinning, interior waterproofing, basement finishing, sump pump installation, concrete foundation repair, legal apartment conversions, walkout basements, and permit coordination - full scope, one licensed crew.

Neighbourhoods Served

UnionvilleThornhillCornellCathedraltownBerczy
4.9 on Google (49+)
Free Estimate Within 2 Hours
Licensed & Insured
20 Active Crews

Markham Basement Issues? Expert Help Available

The homeowners who contact Toronto Basement Underpinning are usually wrestling with one of these. We solve them properly - not with a quick fix that fails in two years.

Cramped Ceiling Height

Old Markham 1960s bungalows in Unionville have 6'6" basements. Newer 2000s infill in Cathedraltown and Berczy Village runs 7'0"+, but most are still unfinished. Underpinning enables a legal lower level.

Cracked Foundation Walls

Heritage-era stone foundations under Unionville Main Street homes show settlement on York Region clay. Newer subdivision homes settle differently but show their own cracking pattern after 15-20 years.

Leaking Basement

Older Markham core homes have failing perimeter drains. Newer Cathedraltown and Berczy Village builds occasionally show under-slab hydrostatic pressure that no surface waterproofing addresses.

Stalled By Permits

Markham heritage overlays cover Unionville Main Street and parts of Old Markham. York Region permits run 4-6 weeks plan review. Our coordinator pre-screens every project.

Our Services for York Region Homes

Basement Finishing

Basement Finishing

Complete framing, rough-ins, drywall, flooring and trim to convert a raw basement into a legal apartment or luxury living suite. Available in Markham as part of our full-turnkey underpinning service.

Basement Walkout

Basement Walkout

Exterior stairwell and door opening cut into your foundation wall, engineered to code, permitted, and waterproofed. Creates a private entrance for a legal basement suite or direct backyard access. Available in Markham as part of our full-turnkey underpinning service.

Concrete & Foundation Repair

Concrete & Foundation Repair

Crack injection, footing repair, and structural reinforcement for Toronto homes, with an honest call on when full underpinning is the right answer instead. Available in Markham as part of our full-turnkey underpinning service.

Drawings & Building Permits

Drawings & Building Permits

End-to-end drawings plus permit coordination, architect, structural engineer, City of Toronto submission, and Committee of Adjustment if zoning relief is needed. Available in Markham as part of our full-turnkey underpinning service.

Interior Basement Waterproofing

Interior Basement Waterproofing

Full interior waterproofing of foundation walls, weeping tile, sump pit, and dimpled membrane, to stop leaks at the source. Available in Markham as part of our full-turnkey underpinning service.

Plumbing & Drain Services

Plumbing & Drain Services

Underground plumbing, main drain replacement, and rough-ins for new bathrooms, most efficient when combined with underpinning or basement finishing. Available in Markham as part of our full-turnkey underpinning service.

Sump Pumps & Battery Backups

Sump Pumps & Battery Backups

Primary plus battery backup sump pump systems sized for Toronto's freeze-thaw water table, eligible for the City of Toronto Basement Flooding Subsidy. Available in Markham as part of our full-turnkey underpinning service.

How Our Markham Service Works

Markham projects go through the City of Markham building department under York Region authority. Unionville Main Street and parts of Old Markham fall under heritage overlays adding 4-6 weeks to plan review; our coordinator pre-screens heritage status during the estimate and pulls the heritage permit alongside the building permit.

Step 1

Free Site Visit

Engineered assessment at your Markham property. Fixed-price quote within two business hours.

Step 2

Drawings & Permits

Architect, structural engineer, Markham building permit submission. We handle every form and every hearing.

Step 3

Staged Construction

Pin-section excavation and pours in Markham. Daily site cleanup. Engineered inspections at every milestone.

Step 4

Inspection & Handover

City sign-off, engineer's stamp, warranty documentation, finishing handoff if bundled in Markham.

Ready for a Free Markham Estimate?

Free engineered assessment. Zero-risk, no-questions-asked warranty on every project.

Why York Region Homeowners Choose Us

City of Markham permit coordinator on staff
York Region framework familiarity
Unionville heritage-overlay coordination
Cornell and Cathedraltown new-construction-era underpinning experience

Markham Landmarks We Work Near

Markham Civic CentreMain Street Unionville

Our Service Area in Markham

What Markham Homeowners Say

“Unionville Main Street heritage home in Markham. The City of Markham heritage overlay scared off three other contractors. TBU's coordinator pulled the heritage permit in seven weeks, underpinned the basement, and respected every original detail.”

Wendy L.

Unionville, Markham

“Cathedraltown 2010-built Markham home. The basement was deep but unfinished. Underpinning was not needed. TBU did interior waterproofing and a sump system instead. They told me up front the underpinning was unnecessary. Honest call, saved us thirty grand.”

Edmund C.

Cathedraltown, Markham

“Berczy Village newer Markham detached. Underpinning to give us full ceiling height for a basement gym. The York Region permit process was quicker than I expected. The crew was respectful of the family schedule for our two young kids upstairs.”

Yi-Chen W.

Berczy Village, Markham

Markham Underpinning Questions

Do you handle Markham heritage overlays?
Yes. Main Street Unionville and parts of historic Markham have heritage overlays. We coordinate the heritage permit alongside the building permit when visible exterior work is needed.
How is Markham different from Toronto for permits?
Markham operates under York Region with its own building department. Plan review timelines are typically 4-6 weeks; fees and inspection cadence differ from Toronto. Our permit coordinator handles it.
What's typical project size in Markham?
Markham detached homes are usually larger than Toronto's, and project budgets follow. Underpinning typically $30,000-$55,000, often paired with premium finishing.
Typical Response Time: 2 Hours

Book Your Markham Basement Assessment

Free estimate within two business hours. Local crews, next-day estimate.

Zero-Risk Warranty Licensed & Insured 20+ Years Specialty