Diamond Home Services logo
Diamond Home ServicesServing Toronto & the GTA
24 HOUR RESPONSE GUARANTEED

Roof Replacement in Underwood, Markham

Professional roof replacement in Underwood, Markham — 24 hour response, licensed & insured.

Call (437) 475-2233
24 hour response
Licensed & insured
OEM parts on the truck

When a roof reaches the end of its life in Underwood, Markham, a proper replacement means more than tearing off shingles. We strip to deck, replace rotted sheathing, upgrade underlayment and ice-and-water shield, and re-flash every penetration. The result is a 25–50 year roof, not a cosmetic recover.

Why roof replacement matters in Underwood, Markham

Full Tear-Off Matters

Layering new shingles over old traps heat, hides deck rot, and voids most manufacturer warranties. We tear off to deck every time.

Real Underlayment

Ice-and-water shield along eaves, valleys, and around every penetration is the difference between a 15-year roof and a 40-year roof in Underwood, Markham.

Ventilation Sizing

Under-ventilated attics cook shingles and grow mould. We measure intake and exhaust and correct undersized systems as part of the job.

Our roof replacement process

  1. 1

    On-Site Assessment

    We walk the exterior in Underwood, Markham, document current condition with photos, and identify every failure point before quoting.

  2. 2

    Written Quote

    You get an itemized estimate — parts, labour, timeline — before any work starts. No surprises.

  3. 3

    Professional Repair

    Our crews use manufacturer-approved materials and industry-standard techniques. Every job is fully insured.

  4. 4

    Cleanup & Verify

    We haul away debris, sweep the work area, and walk the finished job with you before signing off.

  5. 5

    Warranty

    Every job in Underwood, Markham carries a written labour warranty and full manufacturer coverage on materials.

Common findings in Underwood, Markham

  • Rotted deck sheathing under old valleys
  • Improperly sized attic ventilation
  • Missing ice-and-water shield at eaves
  • Old three-tab shingles well past useful life

What you get

Real Craftsmanship

Experienced tradespeople in Underwood, Markham — not day labour — on every job.

Fair, Upfront Pricing

Written quotes before we start. No day-of surprises.

Peace Of Mind

Licensed, insured, and warrantied. If something isn't right, we come back.

Roof Replacement reviews in Underwood, Markham

4.9 average from 743 verified customer reviews
Bundled two services, saved the trip fee
Had the chimney and the dryer vent done on the same visit. Cheaper and half the disruption.
Farah N. - Markham - 2025-12-27
Reliable across three jobs
Used them for a sweep, a dryer vent, and a fireplace service. Same standard every time and the same technician twice, which I appreciated.
Helena B. - Toronto - 2026-04-17
Documentation on everything
Photos, readings, and a written summary after every visit. Makes it easy to keep records for the house file.
Doug T. - Burlington - 2026-01-11
A real person answers the phone
No call centre, no chasing. Booked in two minutes and got a text when the truck was on the way.
Ryan K. - Mississauga - 2026-02-28

FAQ

How long does a replacement take?

Most single-family homes in Underwood, Markham are torn off and re-roofed in 1–3 days.

What brands do you install?

GAF, IKO, BP, Owens Corning, and Malarkey — matched to your budget and warranty preference.

Do you offer financing?

Yes, through third-party lenders with terms up to 120 months.

Book your roof replacement today

24 HOUR RESPONSE GUARANTEED — call now to lock in a slot in Underwood, Markham.

Call (437) 475-2233

More Markham services

Related pages

Roof Replacement in other Markham neighborhoods