Insinööritoimisto Risto Castren Oy is a limited company based in Lahti, registered in 1974. Its taxable income in 2024 was 58 t€ and its income taxes 12 t€.
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Taxes
Measured by taxable income, Insinööritoimisto Risto Castren Oy is in the upper half of the industry class engineering design and technical consultancy incidental to heating, plumbing and air-conditioning (216 companies with taxable income; median 23 t€, 2,6 times the median).
Taxable income is the profit as calculated for taxation, not revenue. Public data from the Finnish Tax Administration; figures for 2025 are published in November 2026. Revenue, financial ratios and employee numbers are shown once the company has filed its financial statements digitally.