Deck Building in Duluth, MN & Superior, WI

At least 5 feet in the Minnesota counties around Duluth and at least 48 inches in Wisconsin. Minnesota sets the 5-foot frost footing depth in Minn. R. 1303.1600, and Wisconsin requires footings at least 48 inches deep or below the frost line, whichever is deeper (Wis. Admin. Code SPS 321.16). Shallower footings get pushed up a little by frost heave each winter, which is how stairs pull loose and decks start to lean. We set deck footings below frost depth and size them for the load they carry.

Yes. A slope changes how a deck is built more than how it looks: downhill posts get taller and need bracing, every footing still reaches frost depth, open sides high above the yard need guards, and the stairs get longer. In Duluth, a deck more than 30 inches above grade needs a building permit even if it's detached, and on a steep slope the low side usually ends up above that. If the hillside itself is shifting or washing out, that gets fixed first with a retaining wall or terracing.

Often the better answer is a detached deck. Stone and old block foundations are a poor place to anchor a ledger board, so a detached deck gets its own beam and footings right beside the house and carries its load without hanging on the wall. If your house has a sound wood rim joist above the foundation, a bolted and flashed ledger can work. Many homes in Duluth's older neighborhoods have stone or block foundations, so we check which you have before designing the deck.

Yes, if the hot tub is part of the plan from the start. A filled tub with people in it weighs far more than the furniture and foot traffic a typical deck is framed for, so the section under it needs its own joists, beams and footings sized for that load. Or set the tub on a ground-level pad and build the deck around it. Send the tub's model or filled weight with your quote request; our hot tub page covers the tub itself.

Yes. We tear off the old deck, check what's underneath, and build the new one to current code on the same footprint or a new one. Old footings stay only if they're deep enough and sound; older decks sometimes sit on shallow piers or blocks, and those get replaced with footings below frost depth. A replacement follows the same permit rules as a new deck. If the old frame is still solid, deck repair or resurfacing may be all you need.

Our planning range for a new deck is $45–$90 per square foot, installed with materials included: footings below the frost line, framing, decking, railing and stairs, from our cost guide. Size, height, decking material, stairs and the site move the total, and every deck gets a written quote you approve before work starts.

Mostly because of what you can't see. Deck footings here have to go below frost (Minnesota code puts the minimum at five feet in the counties around Duluth, and Wisconsin's is at least 48 inches), and the framing, hardware rated for treated lumber, ledger flashing, railings and stairs add up to more than the boards on top. Cutting those corners is why decks start heaving or pulling away from the house after a few winters.

In Duluth, MN, yes for most decks. A deck needs a permit if it is attached to the house, more than 30 inches above grade, or part of an accessible route; only low, detached platforms are exempt (City of Duluth). In Superior, WI, a new deck needs a building permit, but replacing deck boards and stair treads is on the city's list of work that needs no permit. For anything beyond boards and treads, we check what your address needs before we quote.

Late winter or early spring. The Northland building season is short and footings can't go in until the ground thaws, so early bookings get the earliest start dates. Repairs and staining fit into the season more flexibly, but a new build booked in midsummer may not start until late in the season.

Not automatically; the site decides. On flat ground a patio skips the footings, framing, stairs and railings a deck needs. On a slope a deck often comes out ahead, because a patio there needs excavation, fill and sometimes a retaining wall to make level ground. Price both for the same usable area and weigh the upkeep too. If the slope needs a wall before anything else, see retaining walls.

Often, yes. Minnesota requires a residential building contractor or remodeler license from the Department of Labor and Industry for anyone working in more than one special-skill area; single-skill specialists and contractors under the state's small-volume gross-receipts limit who hold a Certificate of Exemption are exempt. Ask any deck builder for their license status, certificate of insurance, and who pulls the permit. The full rules, and how Wisconsin differs, are in our Minnesota handyman license guide.

The calendar is set less by the carpentry than by permit review, concrete cure and the ground itself. The order runs design and material ordering, permit review, footing layout, digging, concrete cure, framing, inspections, then decking and rails. The waits are in permit review, which the City of Superior asks applicants to allow 10 business days for, in the concrete cure, and in frozen ground that can't be dug. Dates and sequence are laid out in your quote.

A floating deck is a low, detached deck on blocks or short piers instead of frost footings, not attached to the house. Duluth calls that a platform and needs no building permit when it's 30 inches or less above grade, not attached, not on frost-depth footings and not part of an accessible route (City of Duluth; see our permit guide). Superior requires a building permit for new decks. Since frost can shift it, it suits a patio-height platform, not a landing at a door.

They can do both, which is why they only suit low platforms. A precast deck block sits on the surface, so soft soil lets it settle under load, and frost lifts it each winter, then drops it unevenly at the thaw. On a low floating deck that movement is tolerable and can be shimmed out. On an attached deck or anything with stairs, it pulls connections apart. A compacted gravel bed under the blocks cuts settling but doesn't stop heave; footings below frost depth do.

A 12x12 deck is 144 square feet, so multiply that by our planning range of $45–$90 per square foot, installed with materials included, for a first budget. Small decks often land toward the upper end per square foot, because the stairs, railing and footings don't shrink as much as the deck does. Height, decking material and the number of steps move the total most. Send photos and rough dimensions, and you'll get a flat written quote to approve before work starts.

There isn't a reliably cheap season; timing mostly changes when you can start. Lumber and composite prices follow the market rather than the calendar, and footings can't go into frozen ground, so Northland deck building runs from thaw to freeze-up. Booking in late winter gets you an early place on the schedule and time to compare materials. The surest ways to lower the price are design choices: a simpler shape, a lower height, fewer stairs and pressure-treated decking instead of composite.

You replace the board, or the damaged length of it, rather than patching it. Wood filler and surface patches don't hold up to foot traffic, water and freeze-thaw, so a split, soft or rotted board comes out and a new piece is cut to break over the center of a joist, then screwed down with fasteners rated for treated lumber. The joist under it gets checked while it's open, since rot often starts there. For bigger jobs, see deck repair.

Yes, especially for a low deck. Grass and weeds left under a deck die off in the shade, hold moisture against the framing and can grow up between the boards. The usual prep is to strip the sod, grade the ground so water drains away from the house, then lay landscape fabric and cover it with gravel. A taller deck gets more airflow underneath, but clearing and grading still keeps moisture and weeds down. Ask for the site prep to be spelled out in any deck quote.

It adds living space, and for taxes it counts as an improvement. IRS Publication 523 lists a deck among the additions that increase your home's basis, the figure used to work out your gain when you sell, while ordinary repairs and maintenance can't be added. What a buyer will pay for a deck depends on your house, your market and the deck's condition, so there's no set return. Build it for how you'll use it, and keep the permit, plans and invoices.

Either can meet code if the fastener suits the lumber. The American Wood Council's prescriptive deck guide fastens wood decking to each joist with two 8d threaded nails or two #8 screws, and requires screws, bolts and nails used with preservative-treated wood to be hot-dipped galvanized, stainless steel, silicon bronze or copper. So a nail gun is fine as long as its nails meet those rules. Composite and PVC boards follow the fastener system in their maker's installation guide instead. Ask which fasteners any deck quote specifies.

Multiply the deck's area, length times width in square feet, by a per-square-foot range; our planning range is $45–$90 per square foot, installed with materials included. Then adjust for the parts that don't shrink with the deck: stairs, railing length, height above grade, footings and the decking material. That's why a small, tall deck with a long stair run costs more per square foot than a bigger, lower one. Send photos and rough dimensions, and the written price spells out each of those parts.

Twin Ports Contracting & Repair builds new decks in Duluth, Superior, Hermantown and the towns around them, on a firm written quote. Text photos and rough dimensions to (715) 919-7956 and many decks can be priced before anyone visits. When a visit is needed it is a flat $95, waived when you approve the work, with no mileage charge. Permit questions come first: we check what your address needs, and who the office requires to pull the permit, before we quote.

Big enough for the furniture you'll really use, plus room to walk around it. Set your table, chairs and grill on the lawn where the deck will go and mark the edges with stakes or a garden hose; if it feels tight on the grass, it will feel tighter with railings around it. Leave clear space outside the door and at the top of the stairs. Since our planning range is priced per square foot, size for use rather than for the biggest footprint the yard allows.