Tiny House Build: 400 sq ft on Budget
Step-by-step case study of a 400 sq ft tiny house built on a tight budget—design, materials, systems, costs, and lessons for DIY builders.
Tiny House Build: 400 sq ft on Budget This tiny house case study walks through how an owner-builder delivered a 400 sq ft eco-friendly home on a tight budget. It shows the design choices, foundation and framing decisions, insulation and finish materials, mechanical and off-grid systems, and a realistic timeline and budget so readers can replicate the results. The article uses the tiny house case study as the organizing frame and gives concrete numbers (cost ranges, R-values, PV sizing, labor-hours) and sources so budget-conscious DIY builders can plan their own project. TL;DR: - Final delivered spec: 400 sq ft, one loft bedroom, completed cost $45k–$85k (DIY labor included), airtightness target ~1.5–3.0 ACH50. - Biggest savings: compact footprint, stick framing, reclaimed finishes; spend on insulation and windows to cut ongoing energy costs. - Recommended systems: 6–9k BTU ductless mini-split, 1.5–3.5 kW PV array for major offset, HRV/ERV for ventilation. Project overview — Tiny House ...