Deck Building in Marshall, WI
Insert Content
Outdoor Living Built on Footings That Never Move
Wisconsin's dwelling code puts deck footings at least 48 inches below grade, and a deck poured shallower than that will heave, rack its railings, and pull its ledger loose from the house within a few freeze-thaw seasons. Greenline Construction, Inc. builds custom decks in Marshall, WI and throughout Sun Prairie, Columbus, Watertown, Lake Mills, and Deerfield, from on-site evaluation and frost-depth footings through framing, ledger attachment, decking, railings, stairs, and multi-level designs in pressure-treated lumber or composite.
We also repair and rebuild aging decks, carefully guide you through the local permitting and inspection process, and help you honestly weigh wood against composite based on your budget and maintenance habits. Our work reflects 30+ years of building outdoor structures that hold up to Wisconsin weather, and every deck is covered by a 1-year labor warranty. Send your ideas and a few photos of your yard through our contact page to schedule an evaluation.
Custom Decks We Design and Build
Site Evaluation and Layout
Together we walk the yard to determine the ideal location, size, height, and orientation for your new deck, considering sun exposure, door placement, grade changes, and how you plan to use the space for cooking, dining, or lounging.
Frost-Depth Footings
Concrete footings are placed at least 48 inches below grade to sit beneath the frost line, then sized to carry the deck's load without settling. Solid footings are the single most important factor in a deck that stays level for decades.
Framing and Ledger Attachment
Joists are spaced for the decking you choose, beams are sized to span tables, and the ledger is bolted and flashed so water cannot reach the house's rim board. This hidden framework is what keeps a deck from developing bounce or soft spots.
Wood and Composite Decking
Pressure-treated lumber offers a lower upfront cost in exchange for regular sealing, while composite resists moisture, insects, and fading with minimal upkeep. Either way, boards are gapped and fastened for drainage and expansion through Wisconsin's wide temperature swings.
Railings, Stairs, and Multi-Level Designs
Guardrails are built to the height and baluster spacing Wisconsin code requires, stairs are cut with consistent rise and run, and multi-level layouts step the deck down a sloped yard to create distinct areas for grilling, dining, and relaxing.
Deck Repair and Rebuilds
Loose railings, rotted boards, and failing ledgers are repaired when the frame is sound. When rot is widespread or the ledger is pulling away from the house, a rebuild on new footings is safer and more cost-effective than patching.

See Our Work
Explore our deck-building projects and see how we create durable, inviting outdoor spaces designed for relaxing and entertaining.
FAQ's
How deep do deck footings need to be in Wisconsin?
Footings should extend at least 48 inches below grade in this area to sit below the frost line and prevent movement during freeze-thaw cycles. Shallower footings heave upward when the ground freezes, which loosens railings and stresses the ledger connection.
What is the difference between wood and composite decking?
Wood costs less up front but requires regular staining or sealing to prevent rot and fading. Composite resists moisture and insects with far less maintenance, though it costs more initially and can feel hotter underfoot in direct summer sun.
How far apart should deck posts and footings be spaced?
Spacing depends on beam size, joist span, and decking material, and is set by code span tables rather than a single rule. Greenline Construction Inc. sizes footings and beams for every deck in Marshall, WI so the frame carries its load without bounce.
Why do some decks develop soft spots over time?
Inadequate joist spacing, poor drainage, or framing lumber that was never properly treated lets moisture penetrate and rot the structure from underneath. By the time deck boards feel spongy underfoot, the joists below have usually been deteriorating for years.
When should an old deck be rebuilt instead of repaired?
If the framing shows widespread rot, the ledger board is pulling away from the house, or the railings are unstable, a rebuild is usually safer and more cost-effective than piecemeal fixes. Isolated board or railing damage on a sound frame can be repaired.
Do I need a permit to build a deck in Marshall?
Most deck projects over a certain size or height require a building permit along with inspections of footing depth, framing, and railings. Greenline Construction Inc. guides Marshall, WI homeowners through that process so the permit is in hand before footings are dug.
How long does it take to build a deck?
A typical deck takes 1 to 2 weeks from footings to final railing, depending on size, material, and any multi-level or stair work. Concrete cure time and weather can add days, so builds are scheduled for the drier months when possible.
What is the difference between an attached and a freestanding deck?
An attached deck ties into the house with a flashed, bolted ledger board and shares the home's structure on that side. A freestanding deck stands on its own posts and beams, which avoids penetrating the house wall but requires extra footings.
Why Choose Us for Deck Building
A Deck That Stays Level Through Every Thaw
Because footings go below the frost line and framing is sized correctly, the deck you step onto in April sits exactly where it did in October. No heaved posts, no racked railings, and no gaps opening at the house.
Water Kept Away From Your House
Ledger flashing, proper board gapping, and drainage planning protect the most vulnerable spot on any home, the point where the deck meets the wall. Rot at the rim joist is expensive to fix and surprisingly easy to prevent.
Honest Guidance on Wood Versus Composite
We explain the real trade-offs, including upkeep, heat underfoot, cost, and appearance, so you choose the material that fits how you will maintain and use the deck. There is no upsell, just the option that suits your household.
Railings and Stairs That Pass Inspection
Guard height, baluster spacing, and stair dimensions are built to current Wisconsin code the first time. Inspections go smoothly, and the people leaning on your railing during a summer cookout are standing behind something built to hold them safely.
Permits and Inspections Guided for You
Nearly every deck project in the area requires a building permit and inspections of footing depth, framing, and railings. We walk you through exactly what is needed and schedule those inspections so paperwork never stalls your build for a week.
Built to Be Used for Decades
Every deck we build is covered by a 1-year labor warranty, but it is designed to outlast that by a wide margin. Correct footings, sound framing, and durable decking mean more summers enjoyed and fewer weekends spent on repairs.
More Summers Outside, Fewer Weekends Repairing
A deck should be the easiest room in the house to enjoy, not the one you inspect nervously every spring for heaving posts and loose boards. Greenline Construction, Inc. builds decks around Marshall, WI that meet the depth, framing, and railing standards Wisconsin weather demands, in the wood or composite that fits your life. Whether you are planning a simple platform off the kitchen, a multi-level layout down a sloped yard, or a rebuild of a deck that has seen better days, we can lay out the options and a schedule. Request an evaluation through our contact page and let's start on your outdoor space.
Why Choose Us
Quality Craftsmanship
I take pride in delivering high-quality workmanship on every construction and remodeling project. I focus on durable materials, careful execution, and attention to detail from start to finish.
Personalized Service
I work closely with each homeowner to understand their vision, needs, and goals. I provide personalized solutions that make every project feel tailored to the customer’s home and lifestyle.
Versatile Services
I offer a wide range of construction and remodeling services, from new home construction and additions to kitchens, bathrooms, basements, decks, and custom projects. This allows me to handle projects of all sizes and scopes.
Reliable Project Management
I prioritize clear communication, dependable service, and organized project management throughout every job. I strive to keep projects moving efficiently while maintaining high standards for quality and customer satisfaction.
"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum consectetur dapibus rhoncus. Curabitur et congue odio. Donec consequat consequat velit. Vestibulum in congue neque. Morbi iaculis lorem sed enim tincidunt finibus. Suspendisse egestas nulla et eros sodales dignissim. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos"
- Maecenas Elementum
"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum consectetur dapibus rhoncus. Curabitur et congue odio. Donec consequat consequat velit. Vestibulum in congue neque. Morbi iaculis lorem sed enim tincidunt finibus. Suspendisse egestas nulla et eros sodales dignissim. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos"
- Maecenas Elementum
- Maecenas Elementum
"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum consectetur dapibus rhoncus. Curabitur et congue odio. Donec consequat consequat velit. Vestibulum in congue neque. Morbi iaculis lorem sed enim tincidunt finibus. Suspendisse egestas nulla et eros sodales dignissim. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos"
Read Our Reviews
Areas We Serve
Marshall, WI
Columbus, WI
Sun Prairie, WI
Lake Mills, WI
Johnson Creek, WI
Watertown, WI
Deerfield, WI
Waunakee, WI
Stoughton, WI
Beaver Dam, WI
DeForest, WI
Cambridge, WI
Fort Atkinson, WI
Whitewater, WI
McFarland, WI
Monona, WI
Cottage Grove, WI
Milton, WI
