Licensed deck builder serving Thornhill. Custom designs, quality materials, code-compliant construction.
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aMaximum Construction is a licensed deck contractor serving Thornhill and the Greater Toronto Area. We design and build custom decks — pressure-treated, composite, cedar, and multi-level — that are built to last and built to code.
Contact us for a free in-person consultation and detailed written quote for your deck project.
BOOK NOWWe are a licensed and insured general contractor serving Toronto and the GTA since 2018.
WSIB clearance, $2M liability insurance, and all permits handled. You are protected from start to finish.
Detailed written quote before any work begins. No hidden fees, no surprise invoices at the end.
We coordinate all trades under one contract. You deal with us — not a dozen different contractors.
Milestone-based schedule with regular updates. We show up when we say we will and finish when we say we will.
Written warranty on all work. We use quality materials and back every job with a workmanship guarantee.
Clean jobsite every day. We treat your home with respect — no mess left behind, no damage to surroundings.
We source quality materials and tools from leading construction retailers across Canada & North America.
Deck building costs in Thornhill typically range from $8,000 to $35,000+, depending on size, materials, and design complexity. Pressure-treated wood is the most affordable option, while composite decking costs more upfront but requires less maintenance. We provide detailed written quotes so you know exactly what you're paying for.
In most municipalities including Thornhill, a building permit is required for decks higher than 24 inches (60 cm) from the ground, or attached to the house. Our team handles the permit process and ensures your deck is code-compliant from start to finish.
For Thornhill's freeze-thaw climate, composite decking (Trex, TimberTech) performs best — it won't warp, crack, or splinter. Pressure-treated cedar is a great natural wood option with good rot resistance. We'll recommend the right material based on your budget, usage, and aesthetic goals.
A standard deck in Thornhill takes 1–2 weeks from permit approval to final inspection. Larger, multi-level decks or those with custom railings and stairs may take 2–4 weeks. We provide a clear timeline before work begins.
Composite decking is made from wood fibres and recycled plastic — it's low-maintenance, doesn't splinter, and carries long warranties (25+ years). Pressure-treated wood costs less upfront but requires sealing, staining, and regular maintenance. Both are strong choices depending on your priorities.
A well-built deck in Thornhill can last 15–30+ years depending on materials and maintenance. Composite decks with proper installation typically last 25–30 years. Pressure-treated wood lasts 15–20 years with regular maintenance. Our workmanship warranty covers the structural build.
Yes. Attached decks are ledger-mounted to the house structure using flashing and hardware designed for Thornhill's climate conditions. Proper ledger attachment is critical — it must meet Ontario Building Code requirements to ensure safety and prevent moisture infiltration.
We offer aluminum, glass, composite, cable, and wood railing systems. Glass and cable railings maximize views, aluminum is low-maintenance, and wood matches traditional deck aesthetics. All railings are installed to OBC height and load requirements.
Yes. We assess existing decks in Thornhill for structural integrity, rotted boards, loose connections, and safety issues. We can repair specific sections or do a full replacement — whichever makes more financial sense for your situation.
Composite decks need only occasional cleaning with soap and water. Wood decks should be cleaned, inspected, and re-sealed or stained every 2–3 years. Keep leaves and debris off the surface, ensure drainage isn't blocked, and check fasteners annually.
Deck construction in Thornhill typically ranges from $15,000–$30,000 for a standard pressure-treated deck and $30,000–$60,000+ for composite or multi-level decks. Contact aMaximum Construction for a free, detailed quote.
Yes, decks over 24 inches from grade require a building permit in Ontario. aMaximum Construction manages permit applications for all deck projects in Thornhill.
A standard deck in Thornhill typically takes 1–3 weeks to build once permits are approved. Larger multi-level decks may take 3–5 weeks. We provide a firm timeline upfront.