Concrete parking lot building in Forest Lake MN - a lot that drains and holds up to trucks

Forest Lake requires a durable, dustless surface such as concrete or asphalt for parking in commercial, industrial and mixed use districts and on non-residential sites, and concrete meets that rule. The surfacing also has to be finished before the building is occupied unless you've made other arrangements with the city, so we plan the pour backward from your opening date.

Usually not, because the state's stormwater manual says permeable pavements have been used where traffic is light, like parking lots and driveways, but aren't proven where trucks pass often. In Forest Lake, permeable pavers or pervious asphalt also depend on the city choosing to consider them as part of a stormwater system, so if trucks come through every day, concrete is the simpler path.

You get your plans reviewed and approved by the city before construction starts, because Forest Lake reviews any new, enlarged, reduced, reconfigured or altered parking lot except at single-family and two-family homes. The City Engineer approves the surfacing and drainage plans, so it's fair to ask every bidder how they'll prepare those. If any work reaches into the right-of-way, the public land along the street, contact the city before it begins.

If your site is inside the Comfort Lake-Forest Lake Watershed District, you need a permit from the district when the job moves or stockpiles 50 cubic yards or more of earth, or disturbs 5,000 square feet or more of land. On non-residential or multifamily sites there, creating 5,000 square feet or more of new or rebuilt hard surface also calls for stormwater management, and every site needs erosion controls like silt fences and biologs, which are fiber rolls that hold soil in place. We confirm early on whether your site falls inside the district, since that decides which of these rules apply.

Yes, as long as the fresh concrete is protected, because cold slows setting and can freeze new concrete before it gains strength. A concrete trade guide counts it as cold weather whenever the air falls to, or is expected to fall below, 40°F while new concrete is being protected, so early-fall and late-spring nights need planning too. The same guide advises using sand for traction and no deicers during the new lot's first winter.

The figure for your lot comes from a written estimate after I walk the site, and it lists what the price covers. A bigger footprint, heavy truck traffic, extra drainage or a cold-weather pour that needs protection pushes the cost up, while a simple layout on ground that's already close to grade keeps it down. I wouldn't save by skimping on the base, since a national concrete guide says lots designed and built around how parking lots differ can serve for many years with little maintenance.