7 questions to ask before choosing deck services
How to use these seven questions
This checklist covers the core decision checks you should use at an on-site consultation and when comparing written proposals for deck services. "Deck services" here means design, permitting checks, structural construction, finishing materials, and any follow-up maintenance the contractor includes. Use the numbered items below as direct questions during meetings; request the documents and examples described with each item before you sign a contract.
Where helpful, this article refers to common industry practice and homeowner guidance on decking decisions and contractor checklists. Use these seven items to compare proposals side by side and to demand the exact documentation you need to hire with confidence in Mississauga and the GTA.
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1. Permits and zoning: will this require a building permit or variance?
Why it matters: municipal permits affect cost, schedule and inspections. In Mississauga and other GTA municipalities permit requirements vary by deck height, distance from property lines, and whether the deck creates new habitable space. A contractor who understands local rules should identify potential permit needs during the site visit rather than treating them as an afterthought.
Ask this: "Will my project require a building permit, zoning variance, or site plan approval? If so, will you handle the applications and inspections, and can you share the application or permit number before work starts?"
What to expect in a professional answer: a clear yes or no, reference to the specific municipal step, and a written plan that either includes the contractor as the permit applicant or shows a statement explaining why no permit is required. If a bidder treats permits as an optional add-on or cannot explain the local process, that is cause to probe further.
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2. Foundation, footings and base prep: how will the deck be supported?
Why it matters: Ontario’s freeze and thaw cycles and varied soil conditions make footing depth, drainage and base preparation critical to long-term performance. Weak footings or inadequate base prep lead to sagging, uneven joists and costly repairs.
Ask this: "Exactly how will the deck be supported: footing depth, concrete piers or helical piles, and any engineered requirements? Will you provide footing drawings or reference to the building code or an engineer when necessary?"
What to expect: the contractor should specify footing type and depth, reference relevant code or an engineer when required, and supply footing details on the plan or quote. A design-build provider that emphasises strong base preparation will describe soil removal, compaction, drainage routes and clean edge control in writing. If the bidder offers only vague assurances about footings, ask for a written footing detail before you sign.
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3. Material and structural specs: what exactly will be built?
Why it matters: vague quotes that list only "decking" or "timber" hide differences that determine longevity and upkeep. The performance and maintenance you get depend on species or composite brand, joist size and spacing, fastener type, ledger flashing and how the ledger is attached to the house.
Ask this: "Please provide a materials list and structural specifications: decking brand or species, joist size and spacing, ledger attachment detail, fastener type, understructure drainage, and whether manufacturer installation instructions will be followed. Will you include product data sheets with the quote?"
What to expect: a professional proposal includes a material list, manufacturer data sheets or references, joist and beam dimensions, and a note that manufacturer guidelines will be followed so warranties remain valid. If the contractor declines to list brands, joist dimensions or fasteners, treat that as a sign the quote is high level and not yet contractor-quality.
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4. Written scope, schedule and payment terms: get these spelled out
Why it matters: vague scopes and informal payment arrangements create disputes. A firm schedule and staged payment plan protect your interests and create clear milestones for inspections and sign-off.
Ask this: "Can you provide a detailed written scope that lists all deliverables, a phased schedule with start and finish dates including municipal inspection windows, a site access and staging plan, and a payment schedule that ties payments to completed milestones? How will change orders be handled and priced?"
What to expect: the contractor should provide a contract or written estimate that lists inclusions and exclusions, an agreed sequence of work, contingency for unforeseen conditions, and a deposit and milestone schedule. Common professional practice is to avoid large upfront sums and to state how additional work will be quoted and approved in writing. If the payment schedule is informal or the scope is one line long, get a more detailed proposal before proceeding.
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5. Insurance, licences and references: how to verify credibility?
Why it matters: liability insurance and worker coverage protect you if something goes wrong on site. Equally important are recent references and before and after photos so you can confirm workmanship quality.
Ask this: "Please provide a current liability insurance certificate naming my property as a location of work if requested, proof of worker coverage or WSIB compliance where applicable, and three recent references with contact details plus photos from completed deck projects."
What to expect: a reputable contractor will email or hand over scanned insurance certificates with effective dates and coverage amounts, explain worker coverage or WSIB status, and share references and photo evidence of similar work. Verify certificates by calling the insurer if you are unsure. Also check recent online reviews and ask to see completed-project photos that match the described materials and structural quality.
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6. Warranty, maintenance and post-completion follow-up: who owns fixes?
Why it matters: workmanship problems and material issues can appear after the first season. Written warranties and a defined post-completion process avoid misunderstandings about who is responsible for repairs and maintenance tasks.
Ask this: "What written warranty do you provide for workmanship, and how do you handle manufacturer warranties for materials? What is your post-completion follow-up and service recovery process, and will you provide a documented sign-off at project closeout?"
What to expect: the supplier should provide a written warranty for workmanship and confirm that manufacturer warranties cover specified materials, with clear instructions for warranty claims. Given that isolated review feedback for local contractors can flag follow-up gaps, request a written service recovery procedure and a sign-off form that documents final acceptance and any outstanding items to be addressed. Requesting a maintenance plan that lists seasonal checks also helps keep your investment in good condition.
Ask bidders to show the exact warranty text and the procedure they use for follow-up so you are not relying on verbal promises alone.
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7. Scheduling, site access and seasonality: when can the work actually happen?
Why it matters: in the GTA, weather windows and municipal inspection cycles shape realistic start and completion dates. Landscaping and existing site features also affect staging, material delivery and protection for plants or hardscapes.
Ask this: "What is your earliest start date, how long will the work take, which weather delays are built into the schedule, and how will you protect existing landscaping and provide site access? Will municipal inspections affect the timeline?"
What to expect: a credible contractor offers a phased schedule that accounts for inspections and seasonal constraints, describes how they will protect existing lawns, beds and paving during construction, and explains logistics for material deliveries and parking. If your property has limited access or precious plants, ask for a written staging and protection plan. Good local providers will propose a start window that reflects municipal inspection lead times and typical seasonal constraints for Mississauga and the GTA.
Before you sign: a short document checklist
Ask every bidder to supply these items in writing so you can compare apples to apples:
- Itemized written scope with inclusions and exclusions
- Materials list, brand names and manufacturer data sheets
- Footing and structural details or a statement that engineered drawings will be provided
- Permit plan or a written statement describing permit responsibilities
- Insurance certificate and proof of worker coverage
- Schedule with milestones, inspection points and payment terms
- Written workmanship warranty and explanation of manufacturer warranties
- Three recent references with photos or links to completed projects
Frequently asked questions
Do I always need a permit to build a deck in Mississauga or the GTA
Not always. Permit requirements depend on deck height, distance to property lines and whether the deck changes occupancy or creates enclosed space. A professional contractor should identify permit needs during the site visit and either file on your behalf or show why a permit is not required. Insist on written confirmation of the permit plan before work begins.
How long should a deck contractor warranty last and what should it cover
Expect written coverage for workmanship and a separate reference to manufacturer warranties for specific products. The contractor should state what is covered, the start date and the procedure for service claims. Insist on written warranty terms rather than verbal assurances so you have a clear process if repairs are needed.
What documents should I insist on before any work starts
Insist on an itemized scope of work, materials list, footing and structural details, permit plan or permit applicant information, proof of insurance, a project schedule with milestones, and a clear payment schedule. Keep copies of all change orders and make final payment contingent on a written sign-off agreeing that specified work is complete.
How can I verify a deck contractor’s insurance and references
Request a current liability insurance certificate and call the insurer to confirm coverage and effective dates if you have doubts. Ask for proof of worker coverage such as WSIB details where applicable. For references, request recent projects similar in scope, call the reference contacts, and view before and after photos. Also check recent online reviews and any public project photos to confirm consistency with the contractor’s claims.
Next step
If you want an on-site consultation that covers the seven questions above and delivers a detailed, maintenance-minded quote, request a visit from HR Greenroots Landscaping. Their design-build approach includes on-site assessment, documented base preparation and grading recommendations, and written maintenance planning so you have clear, comparable proposals and a project plan tailored to Mississauga and the GTA.
