# Build Specs — Jobsite Trade Calculators > Construction trade calculators for plumbing, electrical, and structural design. (iPhone/iPad app by Luke Kazmierowicz.) - Source: https://appshunter.io/ios/app/build-specs/id6764092071 (this page in markdown: same URL + `.md`) - Developer: [Luke Kazmierowicz](https://appshunter.io/developer/902786228) - Category: Utilities, Productivity - Price: Free with in-app purchases - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 15.1 · 57 MB - Languages: American English - Released: 2026-04-29 - Data updated: 2026-08-15 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/build-specs/id6764092071/reviews.md ## What is Build Specs? Build Specs turns code charts and sizing tables into simple field tools. More than just a calculator, it helps you lay out residential gas and water systems, size decks, calculate stair rise and runs, and check voltage drop. Tools included: **Stair Calculator** Calculate risers, treads, stair count, total rise, and layout. Includes a detailed stringer cut diagram. **Gas Line Sizer** Build a visual gas piping layout with fixtures, BTU loads, pipe lengths, and sizing guidance. **Water Line Sizer** Lay out a water supply system visually and estimate pipe sizing based on fixtures and run lengths. **Deck Joist & Beam Sizer** Check common deck joist and beam sizing based on span, spacing, and lumber type. **Voltage Drop Calculator** Estimate voltage drop using wire size, distance, amperage, and voltage. Always verify final designs with local codes, manufacturer specs, and qualified professionals when required. Terms of Use (EULA): https://corvora.app/buildspecs/terms Privacy Policy: https://corvora.app/buildspecs/privacy ## Key features - Stair layout and stringer diagram - Gas line sizing with visual layout - Water line sizing and estimation - Deck joist and beam sizing - Voltage drop calculation - Residential system design tools ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Build Specs Pro | $39.99 | per year | | Build Specs Pro | $9.99 | per month | ## Frequently asked questions about Build Specs ### What is Build Specs used for? Build Specs is a utility app designed to simplify complex construction calculations for tradespeople. It offers tools for laying out residential gas and water systems, sizing decks and stairs, and calculating voltage drop, transforming code charts into practical field tools. ### Does Build Specs have ads? No, Build Specs does not contain advertisements. The app is free to download and use, with optional in-app purchases for advanced features or a pro subscription. ### What are the subscription options for Build Specs Pro? Build Specs Pro offers two subscription plans: a monthly plan for $9.99 with a 7-day free trial, and an annual plan for $39.99, also with a 7-day free trial. These plans unlock additional features and capabilities beyond the free version. ### How accurate are the calculations in Build Specs? While Build Specs provides precise calculations based on industry standards, users are advised to always verify final designs with local codes, manufacturer specifications, and qualified professionals. The app aims to be a helpful tool but does not replace professional judgment. ### What devices is Build Specs compatible with? Build Specs is currently available for iPhone and iPod devices. It runs on iOS and is designed for mobile use in the field. ### How often is Build Specs updated? The latest version of Build Specs, 1.0.5, was released on June 23, 2026. Updates are provided regularly to improve functionality and add new features, ensuring the app remains current with industry needs. ### What specific trade calculations can Build Specs perform? Build Specs includes specialized calculators for stair layout, gas line sizing, water line sizing, deck joist and beam sizing, and voltage drop. Each tool provides detailed diagrams and sizing guidance relevant to its specific trade. ### What is the age rating for Build Specs? Build Specs has an age rating of 4+, making it suitable for a wide range of users. This rating indicates that the app's content is generally appropriate for young children and older audiences. ## Version history (last 5 releases) ### 1.0.5 — 2026-06-23 Adds metric support to the Stair Calculator, including metric measurements and stringer length guidance. ### 1.0.3 — 2026-06-22 New in this version: Added a full stringer diagram to the Stair Calculator, making it easier to visualize your stair layout, tread marks, and cuts before you start building. Also includes small layout improvements and refinements. ### 1.0.2 — 2026-05-05 Improved clarity in subscription options. ### 1.0.1 — 2026-05-05 Subscription loading issue resolved. ### 1.0 — 2026-04-29 No release notes. ## Apps similar to Build Specs | App | Rating | Price | Category | | --- | --- | --- | --- | | [Construction Master Pro Calc](https://appshunter.io/ios/app/construction-master-pro-calc/id370406446) | 4.8 (39,303) | Free | Utilities | | [Stair Calculator: Construction](https://appshunter.io/ios/app/stair-calculator-construction/id1493037366) | 4.1 (738) | Free | Utilities | | [Decking calculator, material](https://appshunter.io/ios/app/decking-calculator-material/id1516587759) | 4.5 (175) | Free | Utilities | | [Construction Calculator](https://appshunter.io/ios/app/construction-calculator/id1092417398) | 4.6 (619) | Free | Utilities | | [Construction Master 5 Calc](https://appshunter.io/ios/app/construction-master-5-calc/id370412148) | 4.8 (13,042) | Free | Utilities | | [RedX Roof - Rafter Calculator](https://appshunter.io/ios/app/redx-roof-rafter-calculator/id1519896740) | 4.7 (847) | Free | Utilities | ## More apps by Luke Kazmierowicz - [Succession - Rack-O style game](https://appshunter.io/ios/app/succession-rack-o-style-game/id952902924) - [Trumpify - Text like Trump](https://appshunter.io/ios/app/trumpify-text-like-trump/id1116455388) - [ScripterCam](https://appshunter.io/ios/app/scriptercam/id6774347836) All apps by Luke Kazmierowicz: https://appshunter.io/developer/902786228 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-15.*