● 13 house plans · 18 ADU plans · Customizable · Permit-ready
House & ADU plans,
customized and permitted.
From backyard studios to 6-bedroom family homes. Buy any plan as-is or make it yours with one flat customization fee. Hire us with the right package and we guarantee your custom design and your permit.
Every plan is engineered by licensed Professional Engineers, not drafters or AI.
- ✓ Licensed Professional Engineers
- ✓ Signed & sealed for permit
- ✓ Engineering since 2002
7,500+
Projects completed
2002
Engineering since
24 + D.C.
PE-stamp coverage
14 days
Delivery · 5-day rush
Three ways in. One engineering team behind every line.
Studio to 3-bed. Every plan can be stamped.
Any plan, made yours. Design and permit, guaranteed.
Step 1
Pick a house or ADU plan
13 single-family homes and 18 ADUs and garage conversions, from studios to 6 bedrooms.
Browse plansStep 2
Customize it for $950 flat
Move walls, resize rooms, add a bedroom, change windows or finishes. One price for any changes, added at checkout.
Step 3
We guarantee the result
Your custom design is guaranteed. Choose the Complete Permit Package and we guarantee the permit too, handling every revision until it's issued.*
*Permit Success Guarantee applies to eligible Complete Permit Packages, confirmed during engineer review.
A complete ADU floor plan. Yours, free.
The Tallow is a 400 sq ft studio designed by our engineering team. Use it to price, plan and pitch your backyard home.
- Dimensioned floor plan
- Window & door layout
- Cost + rent snapshot for your ZIP
- Path to PE-stamped permit set
Go as far as you need. Every step credits the next.
Concept Plan
$149
"I want to price and plan."
- +Floor plan & elevations
- +Get builder quotes
- +Not for permit
Engineer Review
$349
"Can I build this on my lot?"
- +PE reviews your exact lot
- +Zoning, setbacks, utilities
- +Fee credited toward plans
PE-Stamped Plans
from $1,997
"I'll handle the permit."
- +Architectural + structural + MEP
- +Signed & sealed by a PE
- +14 days, or 5-day rush +30%
Permit Package
from $4,997
"Handle it all for me."
- +Everything in PE-Stamped
- +Site, drainage, utility plans
- +All revisions + guarantee*
Build more units.
Wait less for paper.
QuiPlans Pro gives builders a stamped-plan pipeline: license any library plan as often as you build it, and get engineering at member pricing on every lot.
Unlimited
plan-set licenses
Up to 40%
off stamped engineering
7-day
priority turnaround
1
dedicated coordinator
Sheet A-101 · Builder license · Rev 03
See what an ADU earns before you build.
Illustrative national ranges. Your free plan includes a snapshot for your ZIP code.
Est. build cost
$110K–$165K
Monthly rent
$1,800–$2,400
Annual income
$21,600–$28,800
Value increase
$110K–$180K
Estimated annual ROI
14–19%
"Every set that leaves this office is reviewed by a licensed engineer. Not a template. Not a guess. A professional who signs their name to it."
Dr. Mir Emad Mousavi, Ph.D., P.E.
Founder · Lead Reviewer
- Licensed Professional Engineer (P.E.)
- Residential, commercial & industrial background
- Flood zones, hillside, coastal & windstorm sites
- Permitting & inspection experience across states
"We didn't know if our lot was buildable. The engineer review gave us a clear answer in days, not months. We're now permitted and breaking ground."
Marcus T.
Sacramento, CA
"We run eight ADUs a year. Having one engineering team that knows our counties cut our pre-construction time in half."
Builder member
Austin, TX
"The permit package was the best money we spent. They handled every city comment so we didn't have to."
Homeowner
Phoenix, AZ