Summary of significant accounting policies (Tables)

12 Months Ended

Dec. 31, 2024

Schedule of property, plant and equipment

		Expected useful life
Office premises		47 to 51 years
Leasehold improvements		Over terms of the leases or the useful lives whichever is less
Furniture, fixtures and office equipment		3 to 5 years
Motor vehicles		4 years
Testing equipment		3 years

Schedule of reconciliation of backlog representing the amount of revenue

		US$’000

Contract revenue on uncompleted contracts at December 31, 2022			523
New contract awards during the year			9,044
Contract adjustment			252
Contract revenue recognized for the year			(5,797	)
Backlog at December 31, 2023			4,022

Contract revenue on uncompleted contracts at December 31, 2023			4,022
New contract awards during the year			5,621
Contract adjustment			30
Contract revenue recognized for the year			(5,834	)
Backlog at December 31, 2024			3,839

ZHEJIANG TIANLAN

Schedule of property, plant and equipment

	Land use right	Over terms of the leases
	Buildings and leasehold improvements	11 to 50 years, with 5% residual value
	Furniture, fixtures and office equipment	5 years, with 5% residual value
	Motor vehicles	5 years, with 5% residual value
	Plant and machineries	5 to 10 years, with 5% residual value