Home addition
What it really costs to add new space
Real numbers and a real process, based on 50 permitted addition projects and over 20 years of renovation experience.
$140K–$360K+
Turn-key investment range
2026 investment summary
Where your addition budget actually goes
Adding new space starts below the floor and ends with the finishes. Here’s the breakdown across 50 turn-key, permitted addition projects, typically adding 200 to 1,000 square feet.
| Category | What it covers | 2026 range |
|---|---|---|
| Demolition & foundation | Slab or crawlspace foundation work | $15K – $40K |
| Framing, roofing & siding | Vinyl, brick, or Hardie board siding | $30K – $80K |
| Windows & doors | Single hung or casement to fully custom | $10K – $50K |
| HVAC, electrical & plumbing | Adding new lines or extending existing systems | $30K – $75K |
| Drywall, trim & paint | Full interior finish work | $20K – $40K |
| Flooring | LVP, tile, or hardwood | $10K – $35K |
| Architectural & engineered documents | Full stamped plans for permitting | $10K – $15K |
| Lavish design & implementation | Full design, project management, and coordination | $15K – $25K |
Turn-key average investment range
Average price per square foot $300 – $500
$140K – $360K
These ranges include everything — design, permitting, materials, project management, and licensed installers — for additions ranging from 200 to 1,000 square feet, based on over 20 years of experience.
The 5-phase process
How a kitchen remodel actually unfolds
Click through each phase to see the duration, investment, payment trigger, and what gets done — specific to a kitchen project.
- Onsite design and vendor walkthroughs to land the vision
- Define budget and investment priorities for the new space
- Initial selections: flooring, hardware, lighting, windows, doors, roofing, siding, paint
- Engineering or survey documents obtained as required
- Architectural drawings for exterior elevations (30–90 days)
- Build & design internal plan review meeting
Duration
7–20 weeks
Investment
$25K – $50K
Design hours
30–60 hrs
- Construction agreement signed and approved
- Permits applied for (avg. 10–45 days)
- All materials ordered and delivery scheduled
- Job site expectations set: access, storage, dumpster, pets
- Timeline projections confirmed in writing
Duration
9–13 weeks
Investment
$50K – $160K
Design hours
20–30 hrs
- Site cleared and prepared; foundation work begins
- Unforeseen conditions (rot, mold, code issues) addressed transparently
- Framing alterations completed, structural or aesthetic, floor to ceiling
- Electrical, plumbing, and HVAC rough-in completed
- Onsite meeting to finalize behind-wall locations before close-up
Duration
6–12 weeks
Investment
$35K – $95K
Design hours
15–20 hrs
- Drywall and trim installed with primer and first coat of paint
- Final height and location of lighting, plumbing, and HVAC set onsite
- Plumbing, lighting, electrical, and HVAC connected
- Flooring installation or refinishing completed
- Interior painting completed
Duration
6–12 weeks
Investment
$20K – $40K
Design hours
10–20 hrs
- Final safety inspections passed: plumbing, electrical, HVAC, fire
- Certificate of completion delivered (1-year warranty)
- Punch list created and every item resolved
- Final professional cleaning and photo shoot
- Leadership approval and full team sign-off
What’s included
Specialized for the way an addition works
Additions start from the ground up — foundation, structure, and systems before a single finish goes in. Here’s what we specifically account for.
