Maintenance & Repair

Deck Repair in Canmore & the Bow Valley

Heaved piers, sagging joists, loose ledgers, rotted stair stringers, code-deficient railings - fixed properly, not patched. Same-week response on genuine safety issues; written assessment on every job.

What's included

Our deck repair service starts with a 50-point structural assessment and ends with a code-current, written-warranty repair. We don't patch. Every fix addresses the root cause - heaved footings get replaced with helical piles below frost, not shimmed; loose ledgers get re-bolted with proper Maze nails or through-bolts and re-flashed, not screwed back into wet wood; sagging joists get sistered or replaced with the correct hardware, not braced from below. Repairs come with the same lifetime workmanship guarantee we put on our new construction.

Most common Bow Valley repairs we handle: heaved-pier retrofits to helical piles, ledger reattachment with proper through-bolting and step flashing, joist sistering or full replacement, rotted stair stringer replacement, code-deficient railing modernization (36" to 42" with through-bolted posts), deck-board replacement for rot or fastener pullout, and post-base hardware retrofits to Simpson ABU standoff bases. We also handle the small things - squeaky boards, loose handrail returns, gapping cap rail - that don't get a separate line item but show up in every repair we do.

Signs you need this

Deck tilts or one corner sits noticeably lower - usually frost-heaved or settled piers
Visible mid-span sag in the deck surface, especially after a heavy winter
Ledger board gap from the house wall - water has been getting behind it for years
Railings move when you push laterally - posts are no longer secure
Soft spots on the deck surface or visible rot at board ends or fastener heads
Stair stringers show split lines, soft wood at the base, or visible movement under foot
Squeaks or pops consistently in the same area - fastener has lost its grip
Pre-sale inspection report flagged the deck for code or structural issues
Insurance renewal requested a deck safety verification

Our process

Same-week assessment for safety calls; 2-week scheduling for non-urgent. On-site walkthrough with a structural sound-test, fastener pullout check, and code-compliance review.
Written 50-point report. Itemized list of every issue found, prioritized by safety, with photos. You see what we see.
Repair vs. rebuild conversation. Honest assessment of whether targeted repairs make sense or whether you've crossed the threshold where rebuild is the better value.
Quoted scope and parts order. Helical piles, lumber, hardware (Simpson Strong-Tie standard), decking and railing material to match existing where possible.
Repair execution. Most repairs complete in 1-4 days on site. Temporary support installed for the duration where needed.
Final walk-through and warranty. Lifetime workmanship guarantee on everything we touched; written documentation for resale or insurance.

Common repair types and pricing

Repair type	Typical cost	Timeline	Notes
Heaved pier → helical pile	$850-1,400 per pier	1 day per 2-3 piers	Eliminates the heave cycle permanently
Ledger reattachment + flashing	$1,200-2,800	1-2 days	Re-bolt with Maze, step-flash to house
Joist sistering	$180-340 per joist	2-4 joists/day	Restores load capacity
Stair stringer replacement	$480-850 per stringer	1 day per flight	Often paired with closed-riser upgrade
Railing modernization (42")	$85-140 per linear ft	1-3 days	Through-bolted posts, code-current
Decking board replacement	$22-48 per sq ft	Per 100 sf/day	Spot replacement or full re-deck

Pricing factors

Access - decks with low ground clearance or restricted side-yard access cost more in labour for helical pile installs and substructure work.
Scope creep risk - opening up a ledger or substructure often reveals additional rot. We quote known issues fixed-price and provide hourly rates for any additional work discovered.
Material match - replacing a few cedar boards in an existing cedar deck requires sourcing matching stock; aged cedar can be harder to match visually than premium new boards.
Permit requirement - most repairs don't trigger a permit; structural work (new beams, new footings, ledger replacement, decks over 0.6 m off grade with major work) does. Permit fees add $150-450.
Season - winter helical pile installs are possible and we schedule them year-round, but mid-deck or board-level work waits for spring thaw.

Bow Valley local context

Three Canmore conditions drive every repair we make. Frost first: Town of Canmore design frost depth is 1.2 m, and the single biggest source of structural deck failure in the Bow Valley is footings set above that depth - concrete pads, paver footings, short sonotubes, or wood posts set on grade. Every spring the freeze-thaw cycle pushes these footings up, and within 3-5 winters the deck is visibly out of square. The fix is helical piles driven to 1.6 m or engineered concrete piers below the frost line; we've installed over 500 helical pile retrofits since 2015 specifically for heave remediation. Second is snow load: the Town of Canmore design ground snow load is 2.5 kPa (~52 psf), but decks built before the 2010 NBCC update were often sized to 1.9 kPa. After a normal winter the older framing can show mid-span sag of 15-25 mm - visible to the naked eye and a sign the joists are working beyond their design load. We sister or replace joists and add mid-span beams where the original framing can't be brought up to spec. Third is UV: at 1,400 m elevation the UV index runs roughly 20% higher than Calgary (NRC alpine UV data), so cedar and larch boards check and split faster than the same material would at lower elevation. Most of our board-replacement work is UV-driven on decks that were never refinished on the proper 2-3 year cycle.

Permit note: most repairs (board replacement, railing post replacement, stair tread replacement) don't require a Town of Canmore permit. Structural repairs - new footings, beam replacement, ledger replacement, major joist work - do require a building permit when the deck is more than 0.6 m off grade. We confirm the permit path before quoting and handle the application where required. In Banff, Parks Canada review applies to any change in exterior material or finish.

Why choose Canmore Deck Builders

Same-week safety response

We work in the community we live in, and an unsafe deck isn't acceptable. Genuine safety calls - collapsing stair, pulling ledger, loose 2nd-storey railing - get same-week assessment and most often same-week temporary stabilization. Permanent repair is scheduled inside 2-3 weeks.

Same-week response · 100% of safety calls 2024-2025

Root-cause fixes, not patches

Every repair addresses the actual cause. Heaved piers get replaced with helical piles below frost, not shimmed. Loose ledgers get re-bolted with proper flashing, not screwed back into wet wood. We don't sell repeat visits - we sell repairs that hold.

0 repeat-repair callbacks · internal data 2015-2025

Honest repair-vs-rebuild assessment

Roughly 40% of the decks we assess are past the threshold where repair makes economic sense. We tell you when that's the case rather than burning $4,000 on patches to a deck that needs $9,000 to truly be sound. You get a transparent recommendation, not a sales pitch toward the more profitable option.

40% of assessments recommend rebuild over repair

Available across the Bow Valley

We deliver this service in Canmore, Banff, Exshaw, Dead Man's Flats, and Kananaskis.

Common Questions

Frequently asked - deck repair

What are the most common deck problems in Canmore?

Five issues account for roughly 90% of our repair calls in the Bow Valley: (1) heaved piers from frost-heave on shallow footings, (2) sagging joists from snow-load overstress or undersized framing, (3) loose ledger connections from water intrusion at the house-to-deck interface, (4) rotted stair stringers where snow has trapped against end-grain, and (5) code-deficient railings (36-inch height, loose posts) that fail current Alberta Building Code. We diagnose all five on every repair assessment.

How quickly can you respond to a deck safety issue?

For genuine safety issues - a loose railing on a 2nd-storey deck, a visibly collapsing stair, a ledger pulling away from the house - we offer same-week assessment and most often same-week temporary stabilization. Permanent repair is scheduled inside 2-3 weeks depending on parts and weather. We work safety issues into our schedule ahead of new construction work because we live in the community and a fall isn't acceptable.

Can a deck be repaired or does it need to be rebuilt?

Roughly 60% of the decks we assess are repairable. The deciding factors: (1) is the ledger sound or rotted, (2) are footings frost-heaved beyond shimmable tolerance, (3) is more than 30% of the joist count compromised, and (4) is the deck structure built to a code that's now obsolete enough that retrofit isn't economical. Patchable issues run $800-3,500; full structural rebuilds start at $8,000+. We give you a transparent assessment, not a sales pitch toward whichever is more profitable.

Why do Canmore deck piers heave every spring?

Canmore's design frost depth is 1.2 m per the Town of Canmore Building Bylaw. Concrete pads, paver footings, or short sonotubes set above that depth will heave with the freeze-thaw cycle every spring - water in the soil under the footing expands roughly 9% when it freezes and pushes the footing upward. The retrofit fix is helical piles driven to 1.6 m, which engage frost-free soil and eliminate the heave cycle. We've installed over 500 helical pile retrofits since 2015.

What does a deck repair assessment include?

Our standard 50-point assessment covers: ledger connection (bolts, flashing, rot), joist condition (sag, crowning, fastener pullout), beam and post integrity, footing condition (heave, settlement, rot at post base), decking board condition (rot, splitting, fastener heave), railing height and load capacity, stair geometry and stringer condition, and code-current compliance (rail height, sphere rule, guard load). We deliver a written report with prioritized repairs and pricing options.

How much do typical deck repairs cost in Canmore?

Common Bow Valley repair ranges: heaved pier retrofit to helical pile $850-1,400 per pier; ledger reattachment with proper flashing $1,200-2,800; joist sistering (per joist) $180-340; rotted stair stringer replacement $480-850 per stringer; railing modernization to 42-inch code-compliant $85-140 per linear foot. A typical multi-issue repair runs $2,500-5,500. Major structural overhaul beyond $8,000 usually triggers a rebuild conversation.

Concerned about your deck? Get an honest assessment.

Free 50-point on-site assessment across the Bow Valley. Written report, prioritized repairs, repair-vs-rebuild guidance.

Get a free assessment Call 403-678-2345