Decks Porches Additions in Mahtomedi
Deck and porch construction in Mahtomedi typically runs $14 to $30 per sq ft for a pressure treated deck and $24 to $45 per sq ft for a composite deck, depending on deck size and height, material selection and railings and stairs. 18 local contractors serving Mahtomedi. We are still vetting a TenPenny pro for this area.
- 18 local providers
- Washington County, Minnesota
From Stillwater porches to Woodbury decks
In Stillwater the outdoor project is often a porch that has to answer to a historic streetscape; in Woodbury it is a deck for a walkout that the builder left as a door to nowhere. Washington County contains both, plus every era in between.
A local crew fluent in both worlds designs to match the house, handles each city's permitting, and sets footings for frost that does not care what decade your house is from. The benefit is outdoor space that looks born with the house and stays solid.
Mahtomedi is in Washington County. See all trades in Washington County Decks Porches Additions across Minnesota and Wisconsin
What it costs
| Job | Typical range |
|---|---|
| Pressure Treated Deck | $14 - $30 per sq ft |
| Composite Deck | $24 - $45 per sq ft |
| Pressure-Treated Wood Deck | $8,000 - $15,000 |
| Cedar or Redwood Deck | $15,000 - $25,000 |
| Three-Season Porch | $20,000 - $50,000 |
| Four-Season Room Addition | $40,000 - $100,000 |
| Covered Porch/Pergola | $10,000 - $30,000 |
Regional note: Twin Cities metro trends higher than rural areas.
Cost estimates updated July 2026. Estimates only; get a firm quote from a local contractor.
What affects your price
Your quote depends on more than square footage. In Mahtomedi, these are the details that move the price:
- Deck size and height
- Material selection
- Railings and stairs
- Permits and local inspection requirements
- Seasonal timing and crew availability
Local contractors in Mahtomedi
18 local providers in our directory.
For contractors
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Claim exclusive vetted statusCommon questions
How much does a deck cost in Mahtomedi?
Pressure-treated decks in the area typically run $14 to $30 per square foot and composite decks $24 to $45 per square foot, based on size, height, railings, and stairs.
Do I need a permit to build a deck in Washington County?
Most decks over a set height or attached to the house need a permit and frost-depth footings. Check the Washington County permit rules before you start.
Do I need a permit to build a deck in Mahtomedi?
Yes, decks over a set height and any attached structure in Mahtomedi need a building permit and inspections. Local code calls for frost-depth footings so the deck does not heave over winter, and your builder normally handles the permit.
What decking material holds up best in Mahtomedi?
Composite and cedar both perform well in Mahtomedi, with composite trading a higher upfront cost for less upkeep against snow and moisture. Pressure-treated framing with proper flashing is standard underneath either choice.
When should I schedule a deck build in Mahtomedi?
Book a Mahtomedi deck early in the year, since spring and summer fill up fast and footings are easier to dig once the ground thaws. Winter design and quotes let you start as soon as the season opens.
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