Stop guessing and start building with confidence. This planner sizes your solar system, calculates insulation R-values by climate zone, checks weight distribution for safe towing, designs your plumbing layout, and flags building code requirements by state — all in one conversation. ## What's included - **Solar system sizing** — watts needed, battery capacity, panel count, charge controller, inverter - **Insulation R-value calculator** by climate zone (DOE Zones 1-7) - **Weight distribution check** for trailer-based builds (THOW, skoolie, van) — tongue weight, axle limits, payload - **Plumbing layout** — fresh / grey / black water, pump sizing, water heater type - **Building code lookup** by state — RV codes, ANSI/RVIA, NFPA, jurisdiction-specific tiny house rules - **Materials BOM** — every 2x4, sheet of plywood, fastener with quantity - **Cost estimator** — material + tool + labor (if hired help) - **Power load calculator** — what you can run simultaneously (fridge + induction + AC) ## Limitations - **Not a code-compliance certifier** — flags requirements; a structural engineer or building inspector still signs off - **Solar sizing is starting point** — actual production varies with shading, panel angle, weather - **Single-build scope** per session - **U.S.-focused** for codes; international builders adapt - **Doesn't replace tradespeople** for electrical / plumbing — calculations don't substitute for licensed work ## Best fit DIY tiny house, van, and skoolie builders + homesteaders building small. Especially valuable for first-time builders who don't know what they don't know — flagging weight distribution before you build out the kitchen prevents the most expensive class of rookie mistake.
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