You can fit a full bathroom with tub/shower combination in a room that measures 40-square feet. However, on average, a smaller bath (with just a stand-up shower) or a half-bath usually needs to be about 30-square feet for comfort and functionality. Depending on the basement space and layout, you may be able to go with a larger 60-square feet or more bathroom space. Creating bathroom with a separate water closet may require 100-square feet or more.
Local planning departments usually have specific regulations on ceiling height, access doors, radon ventilation, waterproofing and other details of the basement remodeling process. Many building codes now require upgrades such as residential fire sprinklers for new construction or major remodeling projects. Ask about local requirements and get all required permits (or make sure the contractor does this). Depending on the location, permit costs can be next to nothing or extremely expensive; find out exactly what they are and include them in the project's budget.
Your foundation should be inspected prior to finishing your basement. You don’t want to cover up any structural damage that would be identified in an inspection by installing framing and drywall. If items such as pipes have rust, the problem may be humidity instead of a leak, but it can be just as damaging. Waterproofing the basement and using a dehumidifier helps reduce dampness and the risk of mold development.
This online basement remodeling cost calculator is here to give you a basic estimate for finishing your basement. Finishing your basement includes many different variables, so it’s a good idea to get a good idea of the cost as early as possible. Circumstances, materials, and the like can change over time, but a good “ballpark” estimate will give you a basic idea of where you’re starting from. We provide you with this calculator so you can get a better understanding of roughly what finishing your basement will cost.

Your foundation should be inspected prior to finishing your basement. You don’t want to cover up any structural damage that would be identified in an inspection by installing framing and drywall. If items such as pipes have rust, the problem may be humidity instead of a leak, but it can be just as damaging. Waterproofing the basement and using a dehumidifier helps reduce dampness and the risk of mold development.
According to real estate agents and appraisers, a bedroom must have a door, window and closet. Adding a closet to your basement bedroom is crucial to adding value to your basement addition. There are a few components that will affect the cost, the size of the closet being the biggest. The average cost to install a closet is $1,779, with most homeowners spending between $1,272 and $1,917. More than likely, your closet cost will be lower seeing that the size of the closet won’t be nearly as large as your master bedroom or other main bedrooms.
Drywall must be applied to any framed basement walls you have and must be applied to any additional walls used to create your basement bedroom. A standard 8’ by 4’ panel will cost between $10 and $20, depending on the thickness. The cost to install these panels varies, but most homeowners report spending around $1.50/sf. The total cost of your project will range between $1,152 and $1,982, with an average cost of $1,915 to install a wall.
Complete remodel of our walk-out basement. Gutted and replaced literally everything, from the framing to new custom windows and solid doors. Reconfigured plumbing and remodeled the 3-piece bathroom with high-end finishes; completed the laundry room, guest bed room with walk-in-closet, and family room with solid wood custom cabinetry/wet bar, island, built-ins, and gas fireplace with granite surround. Also demolished and rebuilt exterior concrete steps to basement entrance. All finishes are high-end and remodel included many upgrades (in-cabinet/under cabinet lighting, stainless-steel beverage center, central speaker system, etc.) Love the end-result but process was extremely long.
If you want to increase the amount of living space in your home, remodeling your basement makes a lot more sense than adding on a new addition. A finished basement has an ROI of around 70%, making it one of the better investments you can make in your home. A typical basement remodel costs around $90 a square foot, assuming moderate decor and finishes. With the average project size of 600 square feet, this puts the cost of the average basement remodel around $55,000.
If you choose a basic do-it-yourself makeover, including adding moisture control, framing in walls and adding decor and furnishings, your cost will run between $10,000 and $27,000. Waterproofing sealants and additional insulation are just a few of the considerations that will be factored into the final finished basement cost. The price will, of course, also be affected by how much renovating is being done.
Homeowners wishing to enclose basement appliances should take note of air-supply requirements for both the furnace and water heater, which are powered by electricity or natural gas, oil or propane. Fuel-burning appliances use room air for combustion and require an unrestricted air supply. Any enclosure requires installation of a louvered door between living areas and the furnace room to ensure an adequate air supply and ventilation in your basement. Without sufficient air, a house may fill with dangerous gases, including carbon monoxide or radon.

Insulation will help to control the temperature and moisture, and it can act as an additional soundproofing agent. Spray-applied closed-cell foam insulation prices range from $700 to $4,000 or $32 – $80.50 per cubic square foot, per 1” of thickness sprayed. Foam is recommended for basement insulation because it is not air permeable—it won’t cause condensation to build up between the insulation and concrete walls.
If time is critical, consider a basement finishing kit. A finishing kit has insulated wall panels, and some include a walkable flooring surface and ceiling material for DIY installation. Depending on the size of your basement, these kits can be installed in a weekend. However, the floor won't be carpeted, the walls won't be painted, and there will be no electrical or plumbing. Other features such as doors, trim work, and more also need to be added.
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