Building Assistant

Every detail, calculated. Explore 118 building tools, organize your projects, and turn on-site estimates into polished reports. 13 essential calculators are free.

A little clarity. A better build.

Building Assistant brings your everyday construction and site-planning calculations into one thoughtfully designed workspace. From the first sketch to the final pour, keep the numbers close and the work moving.

A TOOLKIT FOR REAL WORK Explore 118 calculators across construction and urban design. Estimate concrete, reinforcement, masonry, finishes, earthwork, formwork, roofing, tanks, and waterproofing. Work through floor area ratios, site coverage, parking, and more.

SEE THE RESULT AS YOU WORK Enter your measurements, choose metric or imperial units, and see quantities update. Clear unit labels, waste allowances, and visible formulas help you follow the calculation.

GIVE EVERY PROJECT A HOME Keep your calculations with a project, add client and site details, and save the notes that matter. Search your history, star useful results, and reuse previous inputs without changing the original record.

GOOD WORK, WELL PRESENTED With Pro, turn calculations into clean PDF reports with your company name, project, inputs, results, and site notes. Preview the report before sharing it.

READY ON SITE Calculations, projects, and history work offline. No account is required. Your work stays on your device, with backup export and import when you need to keep a separate copy or move devices.

MAKE IT YOURS Choose from five architectural color palettes, with light, dark, and system appearance.

START FREE Use 13 essential calculators, create up to 3 projects, and save up to 15 calculations. Reading existing projects and saved results remains available even when you have more than the free limits.

BUILDING ASSISTANT PRO A monthly subscription unlocks all 118 calculators, unlimited projects and saved calculations, and PDF reports. Prices and any eligible introductory offer are shown in the app. Purchases and subscription management require an internet connection. Subscriptions renew automatically unless canceled in your Apple account settings.

Calculations are planning estimates. Verify inputs, assumptions, and applicable local requirements before ordering materials or building.

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