| 1 | Canary Wharf Limited London Turnover £43.3M | £1.3bn | £43.3M |
| 2 | HQCB Investments Limited Turnover £42.0M | £801.6M 2024 accounts | £42.0M |
| 3 | Rwe Renewables UK Dogger Bank South (East) Limited Swindon | £700.2M | — |
| 4 | Canary Wharf Central Limited London | £666.5M 2024 accounts | — |
| 5 | Rwe Renewables UK Dogger Bank South (West) Limited Swindon | £644.3M | — |
| 6 | Monte Blackburn Limited Blackburn | £383.6M 2024 accounts | — |
| 7 | Canary Wharf Investments (BP4) Limited London Turnover £3.1M | £381.0M | £3.1M |
| 8 | Thameswey Housing Limited London Turnover £13.9M | £355.4M 2024 accounts | £13.9M |
| 9 | Shanly Homes Limited Beaconsfield Turnover £57.6M | £236.5M 2023 accounts | £57.6M |
| 10 | O&H Properties Limited London | £221.7M 2025 accounts | — |
| 11 | Road Management Services (Darrington) Limited London | £213.0M | — |
| 12 | Vertus E1/2 Limited London Turnover £7.2M | £212.6M 2024 accounts | £7.2M |
| 13 | Wood Wharf Finance Company Limited London | £211.7M 2024 accounts | — |
| 14 | Urban&Civic Alconbury Limited London Turnover £6.2M | £198.4M | £6.2M |
| 15 | Alder Oak Limited London | £172.5M | — |
| 16 | Harron Homes Limited Leeds Turnover £156.9M | £171.2M | £156.9M |
| 17 | Canary Wharf Properties (Crossrail) Limited London Turnover -£102.1k | £170.0M 2024 accounts | -£102.1k |
| 18 | NQ6 Holdings Limited London | £150.3M | — |
| 19 | NQ6 Property Limited London | £149.6M | — |
| 20 | Newfoundland Propco Limited London Turnover £16.8M | £148.1M 2024 accounts | £16.8M |
| 21 | Pickerings Hire Limited Swadlincote Turnover £70.6M | £143.6M 2024 accounts | £70.6M |
| 22 | Amey Rail Limited London Turnover £229.9M | £138.4M | £229.9M |
| 23 | Canary Wharf Investments (Three) London Turnover £8.0k | £131.9M 2024 accounts | £8.0k |
| 24 | Duglas Alliance Ltd. London Turnover £12.9M | £128.6M | £12.9M |
| 25 | CW 10 Park Drive Limited London Turnover £25.8M | £125.6M 2024 accounts | £25.8M |
| 26 | Purfleet Real Estate Limited London Turnover £6.1M | £124.7M | £6.1M |
| 27 | Canary Wharf Developments Limited London | £121.7M 2024 accounts | — |
| 28 | Fasadgruppen UK Bidco Limited Sheffield | £118.0M | — |
| 29 | Vertus A2 Limited London Turnover £3.9M | £116.1M 2024 accounts | £3.9M |
| 30 | Canary Wharf Retail Finance Limited London | £111.6M 2024 accounts | — |
| 31 | CW One Park Drive Limited London Turnover £47.2M | £107.9M 2024 accounts | £47.2M |
| 32 | Metka - Egn Limited London Turnover £150.4M | £103.3M | £150.4M |
| 33 | Trammell Crow UK Limited London Turnover £742.4k | £100.0M 2022 accounts | £742.4k |
| 34 | Dar RE Finance Co Limited London Turnover £16.8k | £99.9M | £16.8k |
| 35 | CW Properties (B2) Limited London Turnover £8.5M | £92.8M 2024 accounts | £8.5M |
| 36 | Matthew Homes Limited St.Albans | £90.3M 2024 accounts | — |
| 37 | Merthyr (South Wales) Limited Newport | £87.1M | — |
| 38 | Canary Wharf Properties (RT5) Limited London Turnover £5.9M | £86.7M 2024 accounts | £5.9M |
| 39 | Vertus E1/2 Holdings Limited London | £84.9M 2024 accounts | — |
| 40 | Lightspeed Networks Ltd Peterborough | £84.5M 2024 accounts | — |
| 41 | Shardell Limited London | £83.7M | — |
| 42 | Wood Wharf Infrastructure Development Company 2 Limited London Turnover £24.6M | £83.0M | £24.6M |
| 43 | Tide Construction Limited Marylebone Turnover £177.5M | £74.6M 2022 accounts | £177.5M |
| 44 | Eastbrook Facilities Limited London | £71.2M | — |
| 45 | Ocu Utility Services Limited Stockport Turnover £206.1M | £70.2M 2022 accounts | £206.1M |
| 46 | McAleer & Rushe Contracts UK Limited London Turnover £627.7M | £69.9M | £627.7M |
| 47 | Norfolk Homes Limited London Turnover £53.6M | £68.1M 2025 accounts | £53.6M |
| 48 | Baker Estates Limited Newton Abbot | £66.8M | — |
| 49 | Kebbell Development Limited Beaconsfield Turnover £32.2M | £66.7M | £32.2M |
| 50 | Swegon Limited Ashby-De-La-Zouch Turnover £34.1M | £66.6M 2024 accounts | £34.1M |
| 51 | Stanmore Contractors Limited Erith | £65.6M | — |
| 52 | Strata Homes Yorkshire Limited Doncaster Turnover £166.9M | £63.2M | £166.9M |
| 53 | CWG (Wood Wharf Two) Limited London Turnover £4.9M | £62.8M | £4.9M |
| 54 | BL Falkirk Limited London Turnover £8.4M | £61.6M | £8.4M |
| 55 | Low Carbon Farming 5 Limited London | £61.5M 2024 accounts | — |
| 56 | BL Merthyr Limited London Turnover £9.1M | £59.0M | £9.1M |
| 57 | Sof-10 Him Assetco Limited London Turnover £11.8M | £58.4M | £11.8M |
| 58 | Newland Homes Limited Gloucester Turnover £59.0M | £57.5M 2024 accounts | £59.0M |
| 59 | Thames Plaza PLC London | £57.4M | — |
| 60 | Malcolm Allan Housebuilders Limited Kintore Turnover £12.1M | £57.4M 2021 accounts | £12.1M |
| 61 | Winchburgh Developments Limited Broxburn | £57.3M | — |
| 62 | BL Middlesbrough Limited London Turnover £5.6M | £56.4M | £5.6M |
| 63 | City & St James Property Holdings Limited London | £55.3M 2025 accounts | — |
| 64 | Axis CLC Solutions Limited Southampton | £54.9M 2023 accounts | — |
| 65 | Marshall Construction (West Yorkshire) Limited West Yorkshire | £53.2M 2024 accounts | — |
| 66 | BL Ravenhead Limited London Turnover £5.5M | £52.9M | £5.5M |
| 67 | G.S. Brown Construction Limited Perthshire | £52.7M 2024 accounts | — |
| 68 | Eco-Bos Development Limited Liskeard | £51.4M | — |
| 69 | Galldris Services Ltd Harrow | £50.6M | — |
| 70 | The Papworth Trust Huntingdon Turnover £14.5M | £50.5M | £14.5M |
| 71 | Cameron Homes Limited Burntwood Turnover £63.5M | £50.2M 2023 accounts | £63.5M |
| 72 | S Hotels and Resorts (UK) Ltd. London | £50.1M 2020 accounts | — |
| 73 | Low Carbon Farming 6 Limited London | £49.8M 2024 accounts | — |
| 74 | Percy Village Limited London | £49.0M | — |
| 75 | J. Reddington Ltd Borehamwood Turnover £298.1M | £46.7M 2025 accounts | £298.1M |
| 76 | Collins Earthworks Limited Ripley Turnover £81.8M | £46.0M 2020 accounts | £81.8M |
| 77 | Knight Build Limited Billericay | £45.5M | — |
| 78 | G R Potter Plant Hire Limited Thirsk | £45.5M | — |
| 79 | B.P. Mitchell Haulage Contractors Limited Hatfield | £45.4M | — |
| 80 | C.J.L. Construction Limited Bristol Turnover £64.7M | £44.4M | £64.7M |
| 81 | Higgins Partnerships 1961 PLC Essex | £44.1M 2024 accounts | — |
| 82 | Oliver Connell and Son Limited South Greenford | £44.0M 2025 accounts | — |
| 83 | Canary Wharf Investments (RSNQ) Limited London | £43.9M 2024 accounts | — |
| 84 | CW 8 Harbord Square Limited London Turnover £7.9M | £43.7M 2024 accounts | £7.9M |
| 85 | Vision Modular Systems UK Limited Bedford Turnover £86.0M | £43.7M 2023 accounts | £86.0M |
| 86 | Orion Oxford Propco Limited London Turnover £10.4M | £43.6M 2024 accounts | £10.4M |
| 87 | Mulberry Property Developments Ltd Northampton Turnover £70.4M | £43.2M | £70.4M |
| 88 | Midgard Ltd Borehamwood Turnover £579.6M | £43.1M 2025 accounts | £579.6M |
| 89 | Molo Hotels (London Luton) Limited Sale Turnover £9.6M | £43.0M 2024 accounts | £9.6M |
| 90 | Morrisroe Limited Hertfordshire Turnover £80.7M | £43.0M 2019 accounts | £80.7M |
| 91 | Mammoet (UK) Limited Wallsend | £42.9M | — |
| 92 | LHMF 5 Draper 1 Limited London Turnover £0 | £42.0M | £0 |
| 93 | BL Didcot 1 Limited London Turnover £5.8M | £41.5M | £5.8M |
| 94 | Connolly Homes Limited Luton Turnover £10.8M | £40.9M | £10.8M |
| 95 | BL Warwickshire Limited London Turnover £8.8M | £40.8M | £8.8M |
| 96 | Bancroft Limited London Turnover £69.6M | £40.3M 2024 accounts | £69.6M |
| 97 | Egis UK - Consulting and Engineering Limited London Turnover £8.3M | £39.7M | £8.3M |
| 98 | William Wilson Holdings Limited Aberdeen | £39.5M 2021 accounts | — |
| 99 | Cuerden Estates Ltd. Wigan Turnover £30.8M | £38.9M | £30.8M |
| 100 | M.P.B. Structures Ltd Northamptonshire | £38.8M 2024 accounts | — |
| 101 | BSG Civil Engineering Limited Maghera Turnover £36.5M | £37.8M 2024 accounts | £36.5M |
| 102 | Buxted Construction Limited Nr Uckfield Turnover £92.8M | £37.6M | £92.8M |
| 103 | Ashwood Homes Limited Spalding Turnover £43.3M | £37.2M | £43.3M |
| 104 | Domis Construction Limited Wigan | £36.6M | — |
| 105 | Bennett PLC Bury St Edmunds Turnover £21.7M | £36.0M 2019 accounts | £21.7M |
| 106 | Vertus A2 Holdings Limited London | £35.8M 2024 accounts | — |
| 107 | WJ North Limited Newcastle Under Lyme | £35.8M | — |
| 108 | Rose Builders (Properties) Limited Manningtree | £35.8M | — |
| 109 | Jaysam Contractors Limited Middlesex | £35.6M | — |
| 110 | Keltbray Built Environment Limited Thames Ditton Turnover £320.4M | £35.6M | £320.4M |
| 111 | Urban&Civic Corby Limited London Turnover £11.8M | £35.1M | £11.8M |
| 112 | Mervyn Lambert Plant Limited Ipswich Turnover £21.9M | £34.8M | £21.9M |
| 113 | JBM Solar Projects 13 Limited Swindon Turnover £0 | £34.5M | £0 |
| 114 | Advance Northumberland (Developments) Limited Northumberland | £33.8M | — |
| 115 | C3 Construction Limited Leicester Turnover £122.2M | £33.2M 2024 accounts | £122.2M |
| 116 | City Lifting Limited South Ockendon | £33.0M | — |
| 117 | City & Country Residential Ltd Stansted | £32.9M | — |
| 118 | Thomas Homes Limited Southampton Turnover £1.8M | £32.6M | £1.8M |
| 119 | Dream Doors Ltd Brackley Turnover £13.3M | £32.6M 2024 accounts | £13.3M |
| 120 | Dodd Group (Midlands) Limited Shropshire | £32.6M | — |
| 121 | G K R Scaffolding Limited London | £32.0M | — |
| 122 | George Leslie Limited Glasgow | £31.8M | — |
| 123 | Front Line Construction Limited Glasgow | £31.7M 2024 accounts | — |
| 124 | J. H. Turkington & Sons Limited Portadown | £31.4M | — |
| 125 | Ocu Services Limited Stockport Turnover £99.8M | £31.2M 2022 accounts | £99.8M |
| 126 | Qed (Slough) Limited Preston Turnover £4.3M | £31.2M | £4.3M |
| 127 | Ballymore Deanston Limited London | £30.8M 2022 accounts | — |
| 128 | Carey London Limited St. Albans Turnover £96.6M | £30.7M | £96.6M |
| 129 | Galamast Limited Bromley Turnover £54.5M | £30.5M | £54.5M |
| 130 | TGW Limited Market Harborough Turnover £248.8M | £30.4M | £248.8M |
| 131 | Gateway14 Limited Ipswich | £30.1M | — |
| 132 | Huyton Asphalt Limited Liverpool Turnover £43.4M | £30.1M | £43.4M |
| 133 | Pentland Homes Limited Folkestone Turnover £36.1M | £30.1M | £36.1M |
| 134 | Thames Reinforcements Limited Borehamwood Turnover £65.5M | £29.9M 2025 accounts | £65.5M |
| 135 | Next Energy Solutions Ltd Warrington | £29.6M 2025 accounts | — |
| 136 | Vascroft Contractors Limited London | £29.6M | — |
| 137 | T. G. Tunnelling Limited London | £29.4M | — |
| 138 | Network Plus Services Ltd Manchester Turnover £223.5M | £29.3M 2021 accounts | £223.5M |
| 139 | Carver (Wolverhampton) Limited Turnover £43.3M | £29.2M 2024 accounts | £43.3M |
| 140 | Brown and Mason Group Limited Dartford Turnover £46.6M | £29.1M | £46.6M |
| 141 | Techaid Facilities Limited High Wycombe Turnover £2.8M | £28.9M | £2.8M |
| 142 | Tryon Street Limited London | £28.4M 2019 accounts | — |
| 143 | Enigma Industrial Services Ltd Newton-Le-Willows Turnover £62.8M | £28.2M 2022 accounts | £62.8M |
| 144 | Strongvox Limited Taunton Turnover £39.5M | £28.1M | £39.5M |
| 145 | Bugler Developments Limited Rickmansworth | £27.8M 2025 accounts | — |
| 146 | Sarens (UK) Ltd Middlesbrough Turnover £70.8M | £27.5M 2024 accounts | £70.8M |
| 147 | Morro Partnerships Limited Cannock Turnover £56.2M | £27.3M 2022 accounts | £56.2M |
| 148 | Langridge Homes Limited Nottingham | £26.7M | — |
| 149 | E.W. Beard Limited Swindon Turnover £230.2M | £26.5M | £230.2M |
| 150 | Wetherby Wall Systems Limited Golborne Turnover £48.2M | £26.2M | £48.2M |
| 151 | K W Bell Group Limited Cinderford | £25.9M | — |
| 152 | Chestnut Homes Limited Langworth Turnover £37.8M | £25.8M | £37.8M |
| 153 | Integra Contracts Limited Beckenham | £25.8M | — |
| 154 | Strata Homes Limited Doncaster | £25.7M | — |
| 155 | Alliance Groundworks and Civils Limited Walsall Turnover £123.3M | £25.6M | £123.3M |
| 156 | Gelstar Limited London | £25.5M | — |
| 157 | Clipfine Limited London Turnover £88.1M | £25.0M 2024 accounts | £88.1M |
| 158 | Enerveo Limited Fareham Turnover £218.4M | £24.9M 2024 accounts | £218.4M |
| 159 | Breck Homes Limited Preston | £24.6M | — |
| 160 | Ferns Surfacing Limited Maidstone | £24.4M | — |
| 161 | Forkers Limited West Bromwich Turnover £91.6M | £24.4M | £91.6M |
| 162 | Oakmere Homes (Longtown) Ltd Kendal | £24.3M | — |
| 163 | Luddon Construction Limited Glasgow | £24.3M | — |
| 164 | Forsyth of Denny Limited Stirling | £23.6M | — |
| 165 | Hallway Properties Limited London Turnover £5.0M | £23.5M | £5.0M |
| 166 | Peter Duffy Limited Warrington Turnover £32.4M | £23.5M | £32.4M |
| 167 | Alltask Limited Rochester Kent Turnover £50.6M | £23.2M | £50.6M |
| 168 | Robert Heath Heating Limited New Malden | £23.2M | — |
| 169 | Regency Homes Limited Sawbridgeworth | £23.1M | — |
| 170 | Breheny Civil Engineering Limited Needham Market Turnover £131.5M | £23.0M 2025 accounts | £131.5M |
| 171 | John Gunn & Sons Limited Caithness | £22.9M | — |
| 172 | Morbaine Limited Hale Bank Turnover £7.9M | £22.8M 2024 accounts | £7.9M |
| 173 | Faircloth Construction Limited Tunbridge Wells | £22.8M 2024 accounts | — |
| 174 | Simnat PLC London | £22.7M | — |
| 175 | Urban&Civic Waterbeach Limited London Turnover -£22.6k | £22.5M | -£22.6k |
| 176 | Allaway Acoustics Limited Herts | £22.4M | — |
| 177 | Borthwick Heating Insulation UK Ltd Hartlepool Turnover £64.2M | £22.3M | £64.2M |
| 178 | Waitings Limited Penrith | £22.2M 2023 accounts | — |
| 179 | T.S.G. Building Services PLC Potters Bar | £22.0M 2023 accounts | — |
| 180 | Skyline Arcomet Limited Rainham | £21.8M 2024 accounts | — |
| 181 | T & W Civil Engineering Limited Sheffield | £21.8M | — |
| 182 | Cubico (UK) Limited Wakefield Turnover £110.3M | £21.7M | £110.3M |
| 183 | Mulberry Commercial Developments Midlands Limited Northampton Turnover £8.7M | £21.4M | £8.7M |
| 184 | Shropshire Homes Limited Shrewsbury Turnover £50.5M | £21.4M 2024 accounts | £50.5M |
| 185 | Lioncourt Homes (Development No.1) Limited Worcester Turnover £27.9M | £21.2M 2025 accounts | £27.9M |
| 186 | Roffey Homes Limited Worthing | £21.0M | — |
| 187 | Thomas White Oxford Limited Oxford | £20.9M 2019 accounts | — |
| 188 | J. Hopkins (Contractors) Limited Manchester | £20.9M | — |
| 189 | Gcu (UK) Limited Derry Turnover £42.4M | £20.9M | £42.4M |
| 190 | Corserv Solutions Limited Redruth Turnover £99.0M | £20.8M 2020 accounts | £99.0M |
| 191 | Edenstone Homes Limited Caldicot | £20.7M 2023 accounts | — |
| 192 | Blenpark Properties Limited London | £20.7M | — |
| 193 | Gallagher Limited Maidstone | £20.6M | — |
| 194 | Wordsworth Excavations Limited Barnsley Turnover £56.8M | £20.2M | £56.8M |
| 195 | Kingstown Works Limited Hull Turnover £38.2M | £20.2M 2021 accounts | £38.2M |
| 196 | Molo Hotels (Edinburgh) Limited Sale Turnover £6.4M | £20.0M 2024 accounts | £6.4M |
| 197 | Modebest Builders Limited Northolt Turnover £84.5M | £20.0M | £84.5M |
| 198 | Lowry Building & Civil Engineering Ltd Castlederg Turnover £51.5M | £20.0M 2024 accounts | £51.5M |
| 199 | Alpine Fire Engineers Limited Bury Turnover £63.7M | £20.0M | £63.7M |
| 200 | Berks Insulation Limited Slough Turnover £81.2M | £19.9M 2024 accounts | £81.2M |
| 201 | Jones Bros. Ruthin (Civil Engineering) Co. Limited Ruthin Turnover £150.5M | £19.9M 2025 accounts | £150.5M |
| 202 | R.N. Wooler & Company Limited Lawkholme Lane Turnover £41.5M | £19.8M | £41.5M |
| 203 | Bell Contracting Limited Cinderford | £19.8M | — |
| 204 | West Point Construction Limited Redditch Turnover £81.6M | £19.7M | £81.6M |
| 205 | Clark Contracts Limited | £19.7M | — |
| 206 | Broadgate Homes Limited Weston Hills Spalding | £19.6M 2025 accounts | — |
| 207 | A D Bly Construction Limited Hertfordshire | £19.4M 2024 accounts | — |
| 208 | Guildhouse UK Limited | £19.4M 2024 accounts | — |
| 209 | H.W. Martin (Traffic Management) Limited Alfreton Turnover £100.4M | £19.3M 2022 accounts | £100.4M |
| 210 | Liberty Guard (U.K.) Limited Doncaster Turnover £11.8M | £19.3M 2024 accounts | £11.8M |
| 211 | Bell Group Ltd Airdrie Turnover £96.6M | £18.9M 2021 accounts | £96.6M |
| 212 | Kellogg Brown & Root (U.K.) Limited Leatherhead Turnover £150.6M | £18.8M 2024 accounts | £150.6M |
| 213 | McDermott Building and Civil Engineering Ltd Birmingham | £18.6M | — |
| 214 | Lubenham 1 Limited Derby Turnover £40.0M | £18.6M | £40.0M |
| 215 | Fred Champion Groundworks Limited Liskeard Turnover £81.1M | £18.6M 2024 accounts | £81.1M |
| 216 | Cotswold Homes Limited Bristol Turnover £22.6M | £18.4M 2024 accounts | £22.6M |
| 217 | FI Facilities Management Limited Chorley | £18.4M 2025 accounts | — |
| 218 | South Bank Square Ltd Maghera Turnover £13.7M | £18.3M 2024 accounts | £13.7M |
| 219 | BL Didcot 2 Limited London Turnover £3.4M | £18.3M | £3.4M |
| 220 | Thomas Panels & Profiles Limited Herefordshire Turnover £60.6M | £18.3M 2022 accounts | £60.6M |
| 221 | Newlonbuild Limited London Turnover £19.1M | £18.3M 2024 accounts | £19.1M |
| 222 | Heyrod Construction Limited Chadderton | £18.3M | — |
| 223 | Fawley Waterside Limited Southampton Turnover £2.8M | £18.2M | £2.8M |
| 224 | Kirkwood Homes Limited Aberdeen | £18.1M 2024 accounts | — |
| 225 | Applebridge Construction Limited Middlesbrough Turnover £82.9M | £18.1M 2024 accounts | £82.9M |
| 226 | Tinnelly Construction Limited Newry Turnover £25.2M | £18.0M | £25.2M |
| 227 | Thomas Armstrong (Construction) Limited Maryport Turnover £37.2M | £17.9M | £37.2M |
| 228 | Hermiston Securities Limited Inverkeithing, Fife | £17.8M | — |
| 229 | Bronzeshield Lifting Limited Crayford Turnover £7.4M | £17.7M | £7.4M |
| 230 | Atlip House Limited Harrow | £17.6M | — |
| 231 | M.J. McBride Construction Ltd Magherafelt Turnover £11.4M | £17.5M | £11.4M |
| 232 | Logan Construction (South East) Ltd Eltham Turnover £61.0M | £17.5M | £61.0M |
| 233 | Conlon Limited Swindon Turnover £34.9M | £17.4M 2024 accounts | £34.9M |
| 234 | Cotswold Roller Hire Limited Blackpool | £17.2M | — |
| 235 | Kilnbridge Construction Services Ltd. London | £17.1M 2024 accounts | — |
| 236 | Dodd Group (Eastern) Limited Shropshire | £17.1M | — |
| 237 | Abca Systems Limited Newcastle Upon Tyne | £17.0M 2024 accounts | — |
| 238 | Gloster Mep Limited Tunbridge Wells Turnover £45.2M | £17.0M | £45.2M |
| 239 | Rge Services Limited Chigwell | £16.9M | — |
| 240 | Dewsbury & Proud Limited Bilston | £16.9M | — |
| 241 | Opecprime Development Limited London | £16.8M | — |
| 242 | Halsall Mechanical & Electrical Limited Cannock Turnover £53.2M | £16.7M 2025 accounts | £53.2M |
| 243 | Swift Brickwork Contractors Limited Maldon | £16.7M | — |
| 244 | Aptus Utilities Limited Bolton | £16.6M 2024 accounts | — |
| 245 | Canary Wharf (FSLP) Limited London | £16.5M 2024 accounts | — |
| 246 | WJ South Limited Milton Keynes | £16.5M | — |
| 247 | Callan Connect Limited Birmingham Turnover £40.2M | £16.5M 2022 accounts | £40.2M |
| 248 | SBC (Uganda) Limited Birmingham | £16.4M | — |
| 249 | Glanville Cleansing Limited Harrogate Turnover £31.4M | £16.4M 2024 accounts | £31.4M |
| 250 | Trovex Limited Dereham | £16.4M | — |
| 251 | AC Electrical Services (NW) Ltd Blackpool Turnover £17.6M | £16.3M 2024 accounts | £17.6M |
| 252 | Chase Broxbourne Residential Limited Welwyn Garden City | £16.3M 2021 accounts | — |
| 253 | Joe Roocroft and Sons Limited Leyland Turnover £13.0M | £16.2M | £13.0M |
| 254 | O'Hara Bros. Surfacing Limited Middlesex Turnover £38.0M | £16.2M 2024 accounts | £38.0M |
| 255 | Deane Roofing and Cladding Ltd Northampton | £16.2M | — |
| 256 | Classic Builders (South West) Limited Plymouth Turnover £79.6M | £16.1M | £79.6M |
| 257 | Gmi Construction Group PLC Leeds Turnover £233.0M | £16.0M | £233.0M |
| 258 | Tulloch of Cummingston Limited Hopeman | £16.0M 2024 accounts | — |
| 259 | Repton Property Developments Limited Norwich Turnover £14.9M | £16.0M 2025 accounts | £14.9M |
| 260 | Eight Industrial (Wrexham 4) Limited Lancashire | £16.0M | — |
| 261 | I&C Limited Dawlish | £15.9M | — |
| 262 | Addington (Formwork) Limited London Turnover £14.0M | £15.9M 2024 accounts | £14.0M |
| 263 | ZTL Contracting Ltd Middlesbrough Turnover £19.5M | £15.8M 2024 accounts | £19.5M |
| 264 | Ecl Civil Engineering Limited Loughborough Turnover £104.9M | £15.7M | £104.9M |
| 265 | F I Construction Limited Lancashire | £15.6M 2025 accounts | — |
| 266 | Wearmouth Construction and Plant Limited Yarm Road | £15.6M | — |
| 267 | 8Build Limited London | £15.3M | — |
| 268 | Crowland Cranes Limited Peterborough Turnover £12.9M | £15.3M | £12.9M |
| 269 | S 1 Developments Limited London | £15.2M | — |
| 270 | Pentland Properties Limited Folkestone Turnover £7.3M | £15.1M 2025 accounts | £7.3M |
| 271 | Edgewater Contracts & Specialist Joinery Ltd Toomebridge Turnover £110.3M | £14.9M | £110.3M |
| 272 | WJ Groundwater Limited Kings Langley | £14.9M | — |
| 273 | Checkmate Fire Solutions Limited Elland Turnover £52.5M | £14.9M | £52.5M |
| 274 | P. Casey & Co., Limited Rochdale Turnover £44.3M | £14.7M 2020 accounts | £44.3M |
| 275 | Bespoke Construction Services Limited Telford | £14.7M | — |
| 276 | Gaiger Brothers Limited Devizes Turnover £19.0M | £14.7M | £19.0M |
| 277 | Amber Construction Services Limited Barking Turnover £42.3M | £14.6M | £42.3M |
| 278 | Collins Construction Ltd Croydon Turnover £108.0M | £14.5M | £108.0M |
| 279 | A. Connolly Limited Wigan | £14.4M | — |
| 280 | P C E Limited Tamworth | £14.4M 2024 accounts | — |
| 281 | R.J. Heathman (Contractors) Limited North Somerset Turnover £58.2M | £14.3M | £58.2M |
| 282 | Urban&Civic Middlebeck Limited London Turnover £290.1k | £14.3M | £290.1k |
| 283 | Lagan Aviation & Infrastructure Limited Belfast Turnover £63.1M | £14.3M 2024 accounts | £63.1M |
| 284 | Steve Hoskin Construction Limited Pensilva Liskeard Turnover £77.8M | £14.3M | £77.8M |
| 285 | Acorn Construction (Yorkshire) Ltd. Leeds | £14.2M | — |
| 286 | P.M.C. Construction and Development Services Limited Portsmouth Turnover £46.1M | £14.2M | £46.1M |
| 287 | Stanford Industrial Concrete Flooring Limited West Midlands | £14.1M | — |
| 288 | Cheetham Hill Construction Limited Lancashire Turnover £27.1M | £14.1M | £27.1M |
| 289 | Cloister Court Properties PLC Ilford Turnover £873.0k | £14.0M | £873.0k |
| 290 | Pbu (UK) Ltd England | £14.0M | — |
| 291 | Lawrence Baker Limited Oxford | £14.0M | — |
| 292 | Mackenzie Construction Limited | £14.0M 2024 accounts | — |
| 293 | Chichester Homes Developments Limited Barnstaple Turnover £15.1M | £13.9M | £15.1M |
| 294 | Baylis Estates Limited Bristol Turnover £22.7M | £13.9M 2024 accounts | £22.7M |
| 295 | Ken Biggs Contractors Limited Bristol | £13.8M | — |
| 296 | CWG (Wood Wharf Four) Limited London | £13.8M 2024 accounts | — |
| 297 | R.J.T. Excavations Limited Glasgow | £13.8M 2023 accounts | — |
| 298 | Hollywell Building Services Limited Luton Turnover £56.5M | £13.8M | £56.5M |
| 299 | Powersystems UK Ltd Bristol | £13.8M 2024 accounts | — |
| 300 | J.Browne Construction Company Limited Leeds Turnover £47.0M | £13.8M 2020 accounts | £47.0M |