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Compare verified contractors for three-season rooms, four-season sunrooms and porch enclosures. Get free quotes, check licenses, and hire with confidence.
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Sunroom Additions in Metro Detroit: what to expect
A sunroom adds a bright room with lots of glass, usually off the back of the house. The two main types are a three-season room, which is not heated and is used spring through fall, and a four-season room, which is insulated, heated and built like any other part of the house.
Michigan winters make the choice important. A three-season room costs less but is cold from about November to March. A four-season room needs insulated walls and roof, high-performance glass and a heat source, and it is treated as habitable space under the building code.
Many sunrooms are built on an existing deck or patio, but the base must be able to carry the new walls and roof. Footings below frost depth and a roof tie-in that does not leak or cause ice dams are key.
What a proper job includes
- Choice of three-season or four-season design
- Foundation or deck structure checked for the new load
- Framing or a manufactured sunroom system
- Roof tie-in, flashing and gutters
- Windows and doors suited to the season rating
- Electrical and heating by licensed trades
- Building permit and inspections
What drives the price
- Three-season versus four-season construction
- Size and roof style
- New foundation versus building on an existing deck or slab
- Glass type and number of windows
- Heating and cooling approach
- Flooring, lighting and outlets
- Siding and roofing to match the house
Rebuild Detroit does not publish price ranges. Get written quotes for the same scope and compare.
Permits and licensing in Michigan
Sunrooms and porch enclosures require a building permit under the Michigan Residential Code, with electrical and mechanical permits for wiring and heat. In Detroit, permits and inspections go through BSEED; elsewhere, the city or township building department (or the county or state, where they enforce) issues them.
Michigan licenses residential builders and maintenance and alteration contractors through LARA under Article 24 of the Occupational Code. A license is required for paid residential work above a threshold set by state law. Michigan rules require the agreement and any changes to be in writing and signed by both parties.
Verify: LARA license lookup Michigan building permit information Detroit BSEED How We Vet
How to compare quotes
- Decide three-season or four-season before getting quotes.
- Ask how the foundation or existing deck will be verified for the load.
- Compare window glass specs and energy performance.
- Verify the license on the LARA lookup and ask for proof of insurance.
- Compare structural, glass and workmanship warranties in writing.
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Sunroom Additions FAQ
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