Get Your Foundation Plans
Every package is a stamped, site-specific planset + calculation package from a licensed PE. The only question is which path your project takes:
1-Day Instant Plans
Delivered in 24 business hours
Built from our proven state template libraries and made site-specific to your parcel. Buy online, send your site info, permit-ready tomorrow.
- Stamped planset + calculation package
- Slab, stem wall, or block & pier
- Site-specific loads, soils & anchorage
- One revision cycle included
- Same-day rush sometimes available — call first
Custom Engineering
Typically 3–5 business days · rush available
For every other state, and for complex sites anywhere — steep slopes, flood zones, unusual soils, multi-module configurations, or jurisdictions with special requirements.
- Engineered from scratch for your site & jurisdiction
- All 50 states — PE-licensed in 39, partner network for the rest
- Wind & seismic calculations included
- One revision cycle + plan-check support
- Rush processing available (+$500)
- Engineer consultation call
Florida note: Boxabl units are pending DBPR approval, so all FL projects run through this pathway — see the Florida guide.
Not sure which you need? Take the 2-minute lot quiz or call 813-694-8989.
Adding a pitched roof?
The State Approval Covers the Box — Not the Roof.
Gable, hip, and shed roof options are site-built construction, so your building department wants separate site-specific engineering — truss design criteria, connection and bracing details, nailing schedules, and seismic orientation. We deliver it PE-stamped for a flat $449, in 5 business days, in all 21 instant states.