Inside the House in 2026: What Floors, Walls, Basements and Attics Cost

Interior remodeling costs look simpler than roofs or HVAC, and that is exactly why budgets slip. The price of a floor or a paint job depends as much on what is underneath, the old flooring, the subfloor, the condition of the walls, as on the material you choose. This guide prices the main interior projects with 2026 data and shows where the hidden costs hide.

Flooring: what each type costs installed

For material alone, This Old House puts standard vinyl plank at $2 to $7 per square foot and luxury vinyl plank at $3 to $10. Several 2026 industry guides describe luxury vinyl plank as the most installed flooring type in the U.S., mainly because it is waterproof, durable and DIY-friendly.

The prep costs that change a flooring quote

A quote that looks cheap often leaves out removal, leveling or transitions. Ask for each to be listed. Older homes may have flooring or adhesive that contains asbestos, so have old vinyl or tile tested before tearing it out. Compare materials in hardwood vs. laminate vs. vinyl.

Painting: walls, ceilings and trim

Angi reports interior painting at about $2 to $6 per square foot, with an average whole-interior project around $2,022. Two numbers help you read quotes:

• About $2.75 per square foot for walls only
• About $4.70 per square foot when walls, trim and ceilings are included

A room of around 100 square feet costs roughly $200 to $600 to paint professionally, and painting the whole interior of a 2,000-square-foot home runs about $4,000 to $12,000. Paint itself costs about $20 to $70 a gallon, with each gallon covering 300 to 400 square feet.

Prep extras: sanding and patching run about $0.50 to $0.75 per square foot, and popcorn ceiling removal about $1 to $6 per square foot, more if testing finds asbestos. In homes built before 1978, painting that disturbs old paint must follow the EPA's lead-safe renovation rules.

Should you do it yourself? Labor is most of the cost, so DIY saves the most on painting of any interior project, if you have the time and patience for prep. See interior painting: DIY vs. pro.

Basements: finishing vs full remodel

Basement numbers online seem to contradict each other because they describe different jobs:

• Basic finishing work on an already dry, code-ready shell, such as framing, insulation, drywall, flooring and paint, runs about $7 to $23 per square foot, according to Angi.
• A full basement remodel, with electrical, plumbing, lighting and separate rooms, runs about $30 to $75 per square foot. Angi's 2026 national average basement remodel was $22,882, based on 7,253 projects.
• HomeGuide puts a typical finished basement at $30 to $50 per square foot, or $15,000 to $75,000 in total.

Line items that add up:

The rule that matters most: fix water first. Finishing a damp basement traps moisture behind walls and invites mold. Look for efflorescence on concrete, musty smells and water after heavy rain, and solve drainage before framing a single wall. Bedrooms in basements also need code-compliant emergency exits, which can add significant cost. See our basement finishing guide when it publishes.

Attics and insulation

Attic projects range from simple insulation upgrades to full conversions. The energy case for insulation is strong: ENERGY STAR estimates homeowners can save an average of 15% on heating and cooling costs, about 11% of total energy costs, by sealing air leaks and adding insulation in attics, floors over crawl spaces and basement rim joists. Air-seal before adding insulation, and make sure bathroom and kitchen fans vent outdoors, not into the attic. See why your energy bill is so high.

What order should interior projects follow?

Doing interior work in the wrong order means paying twice. A sensible sequence:

1. Fix water and moisture problems in the basement, roof and plumbing
2. Handle electrical and plumbing rough-ins while walls are open; see when a house needs rewiring
3. Insulate and air-seal
4. Drywall, patch and prime
5. Paint walls and ceilings
6. Install flooring last, so it is not damaged by ladders and paint

How do you get accurate quotes?

• Measure rooms and list what is being removed
• Ask each contractor to itemize removal, prep, materials and installation
• Confirm who moves furniture and disposes of old materials
• Ask about permits for basements, electrical and plumbing
• Get at least three quotes; see how to read a contractor quote

Where to go next

• Hardwood vs. laminate vs. vinyl
• Interior painting: DIY vs. pro
• Kitchen and bath remodel costs
• Hidden costs homeowners forget