HoolieHaus Builder Journal

Floor Plan Design & Home Building Blog

Actionable architectural layout tips, framing cost breakdowns, and building code guides—published on a staggered schedule alongside our interactive planning tools.

How to Design a Custom Barndominium or ADU Floor Plan That Saves $15,000+ in Framing & Plumbing

Floor Plan Design Guide

2026-11-055 min read

How to Design a Custom Barndominium or ADU Floor Plan That Saves $15,000+ in Framing & Plumbing

Learn the 4 structural layout rules professional builders use—standard 4-foot bay widths, back-to-back wet walls, clear-span trusses, and mudroom shop buffers—plus test your own dimensions in our Interactive 2D Floor Plan Builder.

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