Smart Lock Budget Builder (BOM & TCO)

Build an itemized budget for your smart lock project. Toggle optional parts, set tax/shipping, contingency, and quantity. Get **per-door**, **one-time total**, **annual recurring**, and **3-year TCO** — then **download CSV**.

🧰 Niche-aware: Options reflect real installs — buck converters for 5 V locks, fuse & glands for 12 V runs, gasket & reinforcement for thin doors, and an optional micro-solar kit for off-grid autonomy.

Hardware & Options (per door)

Smart Lock Hardware ($)

Reinforcement Plate ($)

Weather Gasket ($)

Wiring Kit (AWG, ferrules) ($)

Inline Fuse & Holder ($)

Cable Glands / Grommets ($)

Buck Converter (12→5 V) ($)

Tools/Rental (crimper, hole saw) ($)

Quantity (doors)

Optional Micro-Solar Kit (per project)

Include micro-solar kit

Panel ($)

Controller ($)

Mounting/Brackets ($)

Solar Wire & Lugs ($)

Annual Consumables

Batteries ($/yr)

Maintenance (lube, desiccants) ($/yr)

TCO Horizon (years)

Tax / Shipping / Contingency

Sales Tax (%)

Shipping (%)

Contingency (%)

Optional Labor (one-time $)

Budget Summary

Per-Door Hardware & Options	—
Doors × Quantity	—
Optional Solar Kit (project)	—
Tax + Shipping	—
Contingency	—
Optional Labor (one-time)	—
Total One-Time Cost	—

Annual Consumables (batteries + maintenance)	—
TCO (3 years default)	—

Use a preset or adjust inputs, then click Calculate.

Notes: Percent adders apply to (hardware/options × qty + solar kit). Annual consumables scale with the number of doors. Adjust the horizon to see TCO for 1–5 years.