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Commerce, Oakland County

ADU Construction in Commerce, MI

Compare general contractors who handle adu construction in Commerce, see what the job includes, and get free quotes in minutes.

ADU Construction in Oakland County
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ADU Construction in Commerce

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The job

What adu construction usually includes

  • A zoning check with the local planning office before design starts
  • Site plan and construction drawings suitable for permit review
  • Building permit, plus separate electrical, plumbing and mechanical permits by licensed trades
  • Foundation designed for Michigan frost depth and local soil
  • Utility connections for water, sewer, power and heat
  • Scheduled inspections through final approval to occupy
  • A written contract with a payment schedule tied to milestones
Price

What drives the cost of adu construction in Commerce

  • Type: detached cottage, above-garage unit, or attached or basement conversion
  • Size, layout and number of bathrooms
  • Distance and condition of sewer and water connections
  • Electrical service capacity and whether a new service is needed
  • Heating and cooling approach (separate system or shared)
  • Site access, grading and foundation type
  • Finish level for kitchen, bath and flooring
  • The age of the home: the typical Commerce home was built around 1991, so original parts may be near the end of their life

Before you hire in Commerce

Mid-century and newer systems

Most homes here date from 1991 or later. Original furnaces, water heaters and roofs from that era are well past their service life, so replacement planning matters more than repair.

Michigan basements

Freeze-thaw cycles and clay soils make foundation cracks and wet basements common across Metro Detroit. Foundation and sump pump checks belong on every spring list.

Permits: check with the Commerce building department before work starts.

Compare quotes

How to compare adu construction quotes

  • Confirm with the local zoning office that an ADU is allowed on your lot before paying for full plans.
  • Get written quotes built on the same drawings and finish list.
  • Verify the residential builder license on the LARA lookup and ask for proof of insurance.
  • Ask who pulls each permit and which trades are subcontracted.
  • Compare schedules, payment milestones and the written warranty.

Other general contractor services in Commerce

ADU Construction near Commerce

ADU Construction in Commerce: FAQ

It depends on the municipality. Rules vary widely across the six counties, so check with the local planning or zoning office for your exact parcel.
Some communities allow rental ADUs and some limit them to family members or require the owner to live on site. Rental use may also trigger local rental registration and inspection.
It needs safe connections for water, sewer, power and heat. Whether those are separate meters or shared depends on the utility and local rules.
Compare the pros on this page, starting with verified and claimed profiles, or send one free request and it goes to pros who serve Commerce.
It depends on the scope. Ask the Commerce building department, and expect a licensed contractor to pull any permit the job needs.

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2026 lists

The 2026 list

For general contractors: be one of 5 on the Best General Contractors for ADU Construction in Commerce of 2026 list5 of 5 spots left
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