Room Addition Project Playbook
Calculate framing, drywall, paint, tile, and flooring for a new room addition.
5 phasesDays 1–5 – Days 16–18HardMediumEasy
Get Personalized Quantities
Enter your dimensions in the calculator to get exact material counts, then print your playbook.
Start PlanningPreparation Checklist
- Obtain building permit — room additions always require permits and inspections
- Verify foundation meets local frost depth requirements
- Hire licensed trades for electrical and plumbing rough-in
- Order materials in phases — foundation first, then framing, then finishes
Tools & Equipment
Drywall lift (panel hoist)rent
Tile wet sawrent
Miter saw for trim workbuy
Drywall taping knives and mud panbuy
Paint sprayer or roller kitbuy
Safety dust mask and drop clothsbuy
Execution Timeline
1
Foundation & Rough Framing
Days 1–5Hard
Pour foundation, frame walls, install roof trusses or rafters, and sheath exterior.
Hire Pro (Foundation and structural)
2
Rough Electrical & Plumbing
Days 6–8Hard
Run wiring, outlets, switches, and plumbing lines through framed walls before insulation.
Hire Pro (Licensed trade required)
3
Insulation & Drywall
Days 9–12Medium
Install insulation, hang and tape drywall, apply joint compound and sand smooth.
DIY (Rent drywall lift)
4
Flooring & Trim
Days 13–15Medium
Install tile or flooring, baseboards, door casings, and window trim.
DIY (Tile cutting takes practice)
5
Paint & Finish
Days 16–18Easy
Prime and paint walls and ceiling, install light fixtures and switch plates, final cleanup.
DIY
Common Mistakes
- Skipping the permit and inspection process (unpermitted additions are flagged during home sales).
- Not insulating exterior walls to local code R-value requirements (leads to high energy costs).
- Placing electrical boxes too shallow for final drywall thickness (code violation).
- Installing flooring before drywall finishing is complete — dust and debris damage new floors.
Cleanup Checklist
- Dispose of construction debris — drywall dust, scrap lumber, packaging
- HVAC filters replaced after all drywall sanding is complete
- Final clean — wipe all surfaces, vacuum floors, clean windows
- Return unused flooring, tile, and paint within supplier return window
Maintenance Tips
- Check for settling cracks in drywall after first year — patch as needed
- Keep gutters clean to prevent water infiltration near new foundation
- Monitor humidity levels in new room — consider dehumidifier if above 60%
- Re-caulk trim, baseboards, and window casings as seasonal movement occurs