Basement Finishing Checklist: Your Complete Step-by-Step Guide

Basement Finishing Checklist: Your Complete Step-by-Step Guide

Finishing a basement involves dozens of steps in a specific order. Skip one or do them out of sequence and you create expensive problems. This checklist covers every phase, use it whether you’re hiring a contractor or managing the project yourself.

Phase 1: Pre-Construction Planning

Assessment & Testing

• Moisture test - Tape plastic sheeting to the floor and walls for 48 hours. Any moisture underneath means you have issues to address first
• Radon test - Buy a short-term test kit ($15) or hire a professional ($150). Parts of Utah, especially along the Wasatch Front, have elevated levels
• Measure and document - Total square footage, ceiling height at multiple points, location of existing plumbing/HVAC/electrical, support columns, and obstructions
• Check existing rough-ins - Many Utah homes have pre-plumbed drains and supply lines. Find them before designing your layout
• Inspect the foundation - Look for cracks, efflorescence (white mineral deposits), and water staining. Address any structural issues before finishing

Design & Planning

• Create a floor plan - Room layout including all rooms, hallways, doors, and storage. Consider traffic flow and how spaces connect
• Plan electrical layout - Outlet locations, switch locations, lighting plan, dedicated circuits for high-draw items (heaters, mini kitchen appliances)
• Plan plumbing layout - Bathroom locations near existing rough-ins save thousands. Wet bars and kitchenettes need supply and drain lines
• Plan HVAC extensions - Where will supply and return vents go? Is the existing furnace sized for the additional space?
• Select finish level and materials - Flooring, paint colors, fixtures, lighting. Having these decided before construction starts prevents expensive delays
• Get 2-3 contractor quotes - If hiring out. Compare scope of work, not just price. Ask for references from Utah projects
• Set a realistic budget - Use our cost calculator for a starting estimate, then add 10-15% contingency

Permits & Approvals

• Check local requirements - Contact your city’s building department. All Utah cities require permits for basement finishing
• Submit permit application - Include floor plan, electrical plan, and plumbing plan. Budget 1-3 weeks for approval
• HOA approval - If applicable, submit plans to your HOA. Some have restrictions on exterior changes (egress windows)
• Schedule inspections - Know which inspections are required and when. Typically: framing, electrical rough-in, plumbing rough-in, insulation, and final

Phase 2: Pre-Drywall Construction

Do these in order. Each step depends on the previous one.

Waterproofing & Foundation

• Repair foundation cracks - Epoxy injection or hydraulic cement, depending on crack type
• Install moisture barrier - Specify bulk-water drainage, air sealing and vapor-control layers for the approved assembly; do not add interior polyethylene by habit
• Install interior drain system - If moisture testing revealed issues. French drain along the footing perimeter connecting to a sump pump
• Address radon - If testing showed levels at or above 4 pCi/L, plan a qualified mitigation system and verify it by retesting

Egress Windows

• Cut foundation opening - Professional concrete cutting required
• Install window well - Corrugated steel, stone, or prefabricated well
• Install window - Selected from actual net-clear-opening data and the applicable approved area/height/width requirements
• Install window well cover - Keeps out debris and rain while allowing emergency exit
• Grade around well - Ensure water drains away from the well, not into it

Framing

• Lay out walls - Snap chalk lines on the floor marking all wall locations
• Frame exterior walls - Pressure-treated bottom plates on concrete. Leave gap from foundation wall for moisture management
• Frame interior walls - Standard lumber for walls not touching concrete
• Frame soffits and bulkheads - Box in ductwork, pipes, and beams that can’t be moved
• Install door frames and headers - Size headers appropriately for load-bearing vs. partition walls
• Build closets - Bedroom closets must meet minimum depth requirements
• Frame bathroom walls - Use moisture-resistant bottom plates in wet areas

Electrical Rough-In

• Run wire for all circuits - 15-amp for lighting, 20-amp for outlets, dedicated circuits for appliances
• Install outlet boxes - Per code spacing (every 12 feet along walls, within 6 feet of doorways)
• Install switch boxes - At every room entrance, at top and bottom of stairs
• Run low-voltage wiring - Ethernet, coax for TV, speaker wire, security system wire
• Install recessed light housings - Before insulation goes in
• Install bathroom fan housing - Vented to exterior, not just into the attic
• Wire smoke and CO detectors - Required in every bedroom, outside sleeping areas, and near furnace

Plumbing Rough-In

• Run supply lines - Hot and cold to each fixture location
• Install drain lines - Connect to existing sewer lines. Proper slope is critical
• Set toilet flange - At correct height for your finished floor level
• Install shower/tub drain - Before the concrete patch if breaking the slab
• Pressure test - All supply lines must hold pressure before being closed in

HVAC

• Extend ductwork - Supply and return runs to each room
• Install dampers - To balance airflow between basement and upper floors
• Verify capacity - HVAC system must handle the additional square footage. May need a larger blower motor or supplemental unit
• Install bathroom exhaust fan - Duct to exterior. Minimum 50 CFM for small baths, 1 CFM per sqft for larger

Inspection Checkpoint

• Schedule and pass rough-in inspection - Framing, electrical, plumbing, and mechanical all reviewed before closing walls. This is where inspectors catch issues. Fix anything flagged before proceeding

Phase 3: Insulation & Drywall

Insulation

• Insulate exterior walls - Utah energy code requires specific R-values. Rigid foam, fiberglass batts, or spray foam depending on wall assembly
• Insulate rim joist/band joist - Often missed but a major source of heat loss. Spray foam or cut-and-cobble rigid foam
• Sound insulation - Fiberglass batts in the ceiling between basement and main floor if noise transfer is a concern. Confirm any acoustical specification rather than assuming every theater requires one insulation type
• Insulate plumbing lines - Prevent condensation on cold water pipes, which causes dripping onto new drywall

Inspection Checkpoint

• Schedule and pass insulation inspection - Required before drywall in most Utah cities

Drywall

• Hang drywall - 1/2” standard for most walls and ceilings. Moisture-resistant (green board or purple board) in bathrooms
• Tape and mud joints - Multiple coats with sanding between. This is where quality shows
• Apply texture - Orange peel, knockdown, or smooth. Match the upstairs texture for consistency
• Prime walls - PVA primer on new drywall before paint

Phase 4: Finish Work

Flooring

• Install flooring - LVP, engineered hardwood, tile, or carpet. Choose appropriate materials for below-grade application
• Install transitions - Between rooms with different flooring types
• Install baseboards - After flooring is complete

Paint

• Paint walls - Two coats of finish paint. Use quality basement-rated paint with mildew resistance
• Paint ceiling - Flat white for maximum light reflection
• Paint trim - Semi-gloss for durability and easy cleaning

Fixtures & Trim

• Install interior doors - Pre-hung doors are easiest. Match style to upstairs doors
• Install door hardware - Knobs, hinges, stops
• Install trim - Window casing, crown molding (if applicable), chair rail
• Install electrical devices - Outlets, switches, and cover plates
• Install light fixtures - Recessed lights, pendants, sconces
• Install bathroom fixtures - Toilet, vanity, faucets, mirror, shower fixtures, towel bars
• Install kitchen/bar fixtures - Sink, faucet, cabinets, countertop, appliances

Phase 5: Final Steps

• Final cleaning - Construction dust gets everywhere. Professional post-construction cleaning is worth it
• Touch-up paint - Inevitable scuffs and marks from installation work
• Final inspection - Schedule with your city. Inspector verifies all work meets code
• Certificate of occupancy - Some cities require this, especially for ADUs or rental units
• HVAC balancing - Adjust dampers so basement temperature is comfortable without making upstairs too cold or hot
• Test everything - Every outlet, every light, every faucet, every drain. Run the shower for 10 minutes and check for leaks
• Document warranties - Collect warranty info for all materials and workmanship

Timeline Expectations

Ready to Start?

Print this checklist and use it to track your project. Whether you’re hiring a professional basement finishing contractor or managing subs yourself, knowing the process prevents surprises.

Request a free estimate to start your basement project, or call 801-515-3473 to discuss your plans.

Inspection and safety references

Do not cover framing, trade rough-ins or insulation before the required approvals. Coordinate the exact inspection sequence with the building department. EPA recommends fixing radon at 4 pCi/L or more and considering mitigation at 2-4 pCi/L.

• Greater Salt Lake MSD permit and inspection guidance
• EPA radon action level