Custom Projects in Marshall, WI
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When the Job Does Not Fit a Category, We Build It Anyway
A screened porch, a pergola, and a detached workshop each need posts on footings set at least 48 inches below grade under Wisconsin code, yet none fits neatly into a standard remodeling package, which is why so many of these projects get quoted badly or never built. Greenline Construction, Inc. takes on custom projects in Marshall, WI and across Sun Prairie, Columbus, Watertown, Lake Mills, and Deerfield, including combination interior and exterior work, specialty structures, and multi-trade upgrades.
Each project begins with a consultation about what you want the finished result to do, what constraints your site presents, and how older structures, existing utilities, or access limitations affect the plan. We bring 30+ years of solving problems that template builders avoid, from matching historic details to building on difficult grades, and our 1-year labor warranty covers the completed work. Describe your idea through our contact page and we will tell you what is possible.
One-of-a-Kind Projects We Build
Screened Porches and Sunrooms
Covered, screened outdoor rooms are built on frost-depth footings with roofs tied properly into the house, giving you mosquito-free evenings from May through September. Sunroom conversions add insulated walls, windows, and heat so the same space works year-round.
Pergolas and Outdoor Structures
Pergolas, covered patios, and outdoor kitchens are designed to complement the house and anchored on footings that will not heave in spring. Post spacing, beam sizing, and roofing or lattice details are engineered for Wisconsin snow load and wind.
Combination Interior and Exterior Projects
Projects that pair a kitchen remodel with a new deck, or a basement finish with an egress window and exterior grading, are planned as one coordinated scope. Shared site work, permitting, and scheduling keep the whole job efficient.
Historic and Farmhouse Details
Matching original trim profiles, window proportions, and siding patterns on century-old farmhouses takes one-off fabrication and patience. New work is integrated so it looks intentional and period-appropriate rather than obviously modern, preserving the character that made you buy the place.
Difficult Sites and Grades
Sloped lots, tight access, existing utilities, and structures that have settled or shifted call for tailored foundations, drainage, and framing solutions. We plan around what is actually there instead of forcing a standard approach onto a site that resists it.
Multi-Trade Specialty Upgrades
Upgrades that require carpentry, electrical, plumbing, HVAC, and specialty fabrication to come together in sequence are coordinated under one plan. You deal with a single point of contact rather than juggling five separate contractors who have never met each other.

See Our Work
View our custom projects and see how Greenline Construction Inc. brings unique ideas to life with skilled craftsmanship and attention to detail.
FAQ's
What makes a project custom rather than standard?
Unique materials, nonstandard dimensions, combination scopes, or site-specific problems without a template solution all push a project into custom territory. A pergola on a sloped yard, a porch on a farmhouse, or a workshop with heavy-duty power are typical examples.
Do I need a permit for a screened-in porch or pergola?
Most jurisdictions require a permit for a screened porch because it adds a roofed structure on a foundation. Pergolas often need one above a certain footprint or when attached to the house. Greenline Construction Inc. confirms requirements for Marshall, WI projects during planning.
What is the difference between a screened porch and a sunroom?
A screened porch is an open-air room enclosed with screening and a roof, used in warm months. A sunroom is fully enclosed with windows, insulation, and often heating, so it functions year-round. Many porches are built so they can be converted later.
Why do some custom projects take longer than expected?
Unforeseen conditions uncovered during demolition, delayed deliveries of special-order items, and weather interruptions can extend timelines, particularly for outdoor work during winter months. Locking in decisions early and ordering long-lead materials up front reduces most of that risk.
When should design changes be finalized on a custom build?
The earlier decisions are locked in, the smoother construction proceeds. Some adjustments are inevitable once framing is exposed or utilities are accessed, but layout, materials, and finishes should be settled before ordering begins to keep costs and schedule predictable.
What happens if the original plan does not work once construction starts?
Your project is adjusted based on what is found in the field, with your input on how to proceed in a way that meets the original intent within the revised constraints. Every change is documented and priced before the work continues.
How do I combine several projects into one build?
Bundling a deck, porch, and garage into one plan lets shared site work, permitting, and scheduling cover all of them at once. Greenline Construction Inc. sequences combined projects in Marshall, WI so each structure supports the next instead of competing for the calendar.
Does a screened porch add square footage to my home's value?
Screened porches are usually counted as porch or bonus space rather than heated living area in an appraisal, but they add real value and appeal to buyers. Converting to a fully enclosed, heated sunroom is what moves the space into finished square footage.
Why Choose Us for Custom Projects
Your Vision Drives the Plan
Scope is built around what you want the finished space to do, not around a preset package. If the idea in your head does not match anything in a catalog, that is usually a sign it needs a custom builder.
Problems Solved Before They Surface
Access limits, buried utilities, settled foundations, and drainage are identified during planning so they inform the design instead of derailing construction. Surprises still happen in older homes, but far fewer of them, and each one is priced before work continues.
Phasing That Fits Your Life and the Seasons
Larger custom projects can be split into stages that respect occupied spaces, budget cycles, and Wisconsin weather, with outdoor structures scheduled for the building season and interior phases through winter. You set the pace and we build to it.
Materials Balanced for Cost and Durability
You get honest recommendations on where a premium material earns its price and where a mid-range option performs just as well. Custom does not have to mean expensive; it means every material was chosen deliberately for your project.
Flexibility When Conditions Change
If framing reveals something unexpected, the plan adjusts with your input to meet the original intent within the new constraints. Decisions are made together and documented, so the finished project still matches what you set out to build.
Finished Work That Looks Intentional
Whether it is a pergola, a porch, or a workshop with a loft, the completed structure looks like it belongs to the property and performs reliably year after year. Our 1-year labor warranty stands behind every one-of-a-kind build we complete.
Built for the Way You Want to Use Your Property
Some of the most rewarding projects we take on are the ones that started with a homeowner saying nobody else would quote it. Greenline Construction, Inc. has spent 30+ years around Marshall, WI figuring out how to build screened porches on old farmhouses, pergolas on sloped yards, workshops with real power, and combination projects that touch every trade, and the finished results look like they were always meant to be there. If your idea does not fit a typical service page, that is exactly where we would like to start the conversation. Request a consultation through our contact page and tell us what you are picturing.
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.
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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
