Construction Calculator for Japan

Free construction calculators preconfigured for Japan. FRELUX runs every calculation with this market's template defaults: local wall units, 25kg cement bags, and local electrical and plumbing practice. Prices come from the live price database in JPY (¥).

Japan building-practice defaults

• Default wall unit: JIS C-Block 120 (390x190x120mm) (390 x 190 x 120 mm)
• Cement bag weight: 25 kg
• Currency: JPY (¥)

Electrical practice

• Standards: Electrical Appliance and Material Safety Law (DENAN), JIS C 8305 & JIS C 3342
• Nominal voltage: 100V single-phase (100V/200V split-phase for air conditioners)
• Typical wiring: Flat vinyl insulated vinyl sheathed cable (Type VVF 600V) stapled directly inside timber post-and-beam frame cavities

Plumbing practice

• Standards: JIS S 3200 (Water Supply Equipment), SHASE-S 206 & Waterworks Law (Suido-ho)
• Water supply piping: Cross-linked polyethylene pipe (JIS K 6769 PEX) with central header distribution (Sayakan header system)

Start a calculation

• Build-to-Roof Estimator: full construction cost from foundation to roof
• BOQ Generator: bill of quantities with VAT and contingency
• Electrical Estimator: wiring takeoff per Japan practice
• Plumbing Estimator: water supply and drainage takeoff
• Regional Cost Index: current material price levels

Are these figures certified for Japan?

They are template starting defaults for quantity takeoffs, referenced to the standards listed above. Always confirm sizes, materials and current prices with your local supplier or licensed professional before purchasing.