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Summary of significant accounting policies (Tables) | 12 Months Ended
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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

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