Construction is the biggest single sector on UK Companies House, ~600,000 active companies across SIC 41–43. Leadistry slices that volume by sub-trade (electrical, plumbing, joinery), region, and growth stage so you can target the segment your B2B service actually fits.
SIC 43210 = electrical, 43220 = plumbing/HVAC, 43320 = joinery, 43342 = painting/decorating. Each is its own micro-market with distinct outreach needs. Leadistry's 5-digit SIC filter picks them apart cleanly.
SIC 41100 (development of building projects) is where the residential developers live. Filter by incorporation age 5+ years for established firms with multiple sites, or 0–3 for new entrants likely to need partner trades.
Construction is local. Filter by postcode prefix (e.g. M, BB, OL for Greater Manchester) and your search returns only companies in your service radius, no wasted outreach.
Owner-director + named-personal email + registered/trading address + website (often basic, sometimes none, see /for/marketing-agencies if you sell digital). Useful for material suppliers, subcontracted trades, plant hire, fleet insurance, and SaaS targeting construction.
~600,000 active UK companies under SIC codes 41–43 as of the most recent Companies House refresh. Leadistry indexes every one and refreshes daily, so newly-incorporated trades show up within 24 hours.
Indirectly, by accounting category (micro / small / medium). A company filing micro accounts has fewer than 10 employees; small is 10–50; medium is 50+. This is the strongest size proxy Companies House publishes without forcing you to scrape balance sheets.
It's an opportunity. A company with no website discovered is still just 1 lead on Leadistry, the same as any other delivered company, so the no-website cohort costs you nothing extra. If you sell digital services to construction, see /for/marketing-agencies.
Other use cases: UK accountants · UK recruitment agencies · UK marketing and digital agencies · UK estate and letting agents · UK solicitors and law firms · UK commercial cleaning companies · UK logistics, haulage, and freight · UK hospitality and leisure suppliers · UK IFAs and financial advisors · UK SaaS and software vendors
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