Construct365 rankings

UK Construction League Tables

Our own rankings of the UK's leading contractors, architects, consultants and housebuilders — ranked live by filed-accounts turnover, with a full SIC-code directory alongside.

Paid promotion never affects ranking position. League-table positions are based solely on financial figures (turnover or net worth); promoted businesses are highlighted visually but ranked exactly like everyone else.

Beta: League table data is still being populated and verified during beta — rankings and financial figures may be incomplete and will improve as we add more companies.

Our rankings

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Electrical installation

Industry lists:Contractors 100Top 100 ContractorsArchitects 100Top 100 ArchitectsConsultants 150Top 150 ConsultantsHousebuilders 50Top 50 HousebuildersContractors & HB 150Top 150 Contractors & HousebuildersPlant Hirers 100Top 100 Plant Hirers

Top 3 — Annual Turnover

Full Rankings — Annual Turnover

250 companies

Rows marked with show figures sourced from Companies House filed accounts.

#			Reg No.		Previous Period		Year End	Status
🥇	TCLARKE CONTRACTING LIMITED ltdTclarke.co.uk	London	00189434	£846.7m Estimated	—	—	—	active
🥈	DALKIA GROUP LIMITED ltdEssc-india.org	London	09752439	£656.6m Estimated	—	—	—	active
🥉	ALTRAD SERVICES LIMITED ltdaltrad.com	Warrington	03337119	£550.9m Estimated	—	FY2023	—	active
4	ABB LIMITED ltdAbb.com	Warrington	03780764	£449.6m Estimated	—	—	—	active
5	BILFINGER UK LIMITED ltdIs-uk.bilfinger.com	Warrington	05384376	£418.2m Estimated	—	—	—	active
6	NG BAILEY LIMITED ltdngbailey.co.uk Contractors 100 #21Contractors & HB 150 #38	Leeds	00342778	£346.1m Estimated	—	FY2023	—	active
7	OCS FM LIMITED ltdOcs.co.uk Contractors & HB 150 #65	Ipswich	00806888	£333.0m Estimated	—	—	—	active
8	HITACHI ENERGY UK LIMITED ltdAbb.com	Birmingham	02985756	£330.0m Estimated	—	—	—	active
9	PHOENIX ME LIMITED ltdPhoenixme.co.uk Contractors & HB 150 #72	London	00255476	£319.1m Estimated	—	FY2025	30 Sept 2025	active
10	SOLARPRO HOLDING PLC plcSolarpro.bg	London	11682894	£299.8m Estimated	—	—	—	active
11	C.L.C. CONTRACTORS LIMITED ltdClcgroup.com	Southampton	01230435	£287.6m Estimated	—	—	—	active
12	SKANSKA RASHLEIGH WEATHERFOIL LIMITED ltdSkanska.co.uk	Leavesden	00798550	£270.5m Estimated	—	—	—	active
13	GRATTE BROTHERS GROUP LIMITED ltdGratte.com Contractors & HB 150 #79	London	02732546	£242.5m Estimated	—	—	—	active
14	DALKIA ENGINEERING LIMITED ltdImtech.co.uk	Nottingham	00443522	£234.3m Estimated	—	—	—	active
15	NORDEX UK LIMITED ltdNordex-online.com	Manchester	04218191	£225.7m Estimated	—	—	—	active
16	GRATTE BROTHERS LIMITED ltdGratte.com	London	00411138	£199.6m Estimated	—	—	—	active
17	CBES LIMITED ltdCbes.co.uk	Glasgow	SC288763	£183.4m Estimated	—	—	—	active
18	ESSEX GROUP HOLDINGS INTERNATIONAL LIMITED ltd	Rochford	10217582	£163.8m Estimated	—	—	—	active
19	ESSEX SERVICES GROUP LIMITED ltdEsgplc.com	Romford	01224662	£163.7m Estimated	—	—	—	active
20	DATALEC POWER INSTALLATIONS LIMITED ltdDatalecltd.co.uk	Buntingford	08235914	£161.8m Estimated	—	—	—	active
21	DODD GROUP (MIDLANDS) LIMITED ltdDoddgroup.com Contractors & HB 150 #82	Shropshire	01179878	£160.8m Estimated	—	—	—	active
22	H&MV ENGINEERING SERVICES LIMITED ltdHmveng.co.uk	London	12164983	£146.2m Estimated	—	—	—	active
23	JOSEPH GALLAGHER GROUP LIMITED ltdJosephgallagher.co.uk	Orsett	03792735	£135.9m Estimated	—	—	—	active
24	POWERTEAM ELECTRICAL SERVICES (UK) LIMITED ltdOmexom.co.uk	Belfast	NI034635	£130.3m Estimated	—	—	—	active
25	BRIGGS & FORRESTER ENGINEERING SERVICES LIMITED ltdBriggsandforrester.co.uk	Kingsthorpe	01106549	£124.3m Estimated	—	—	—	active
26	HOUSING MAINTENANCE SOLUTIONS LIMITED ltdHousingmaintenancesolutions.org	St. Helens	07237932	£121.6m Estimated	—	—	—	active
27	POWER ON CONNECTIONS LTD ltdPoweronconnections.co.uk	Bury St. Edmunds	04912774	£120.4m Estimated	—	—	—	active
28	THE BARNES GROUP LIMITED ltdbarnesconstruction.co.uk	Ipswich	01359667	£117.5m Estimated	—	—	—	active
29	ERIC WRIGHT WATER LIMITED ltdEricwright.co.uk	Preston	01835168	£116.2m Estimated	—	—	—	active
30	TILBURY DOUGLAS ENGINEERING LIMITED ltdInterserve.com	London	03044398	£110.5m Estimated	—	—	—	active
31	SPL POWERLINES UK LIMITED ltdPowerlines-group.com	Coatbridge	SC202412	£107.2m Estimated	—	—	—	active
32	LORNE STEWART PLC plclornestewart.co.uk Contractors & HB 150 #139	Harrow	01348218	£106.7m Estimated	—	FY2023	—	active
33	J C A ENGINEERING LTD ltdJca.co.uk	London	04433957	£104.0m Estimated	—	—	—	active
34	BRIGGS & FORRESTER LIVING LIMITED ltdCombinedenergysolutions.com	Kingsthorpe	01867941	£103.4m Estimated	—	—	—	active
35	AIDAN STRAIN ELECTRICAL ENGINEERING LIMITED ltdAseeltd.com	Newry	NI038846	£102.6m Estimated	—	—	—	active
36	KING & MOFFATT UK LIMITED ltdKingmoffatt.com	Wolverhampton	07023887	£94.5m Estimated	—	—	—	active
37	QUARTZELEC LTD ltdQuartzelec.com	Rugby	02364716	£93.8m Estimated	—	—	—	active
38	P.I.P. ELECTRICS LIMITED ltdPip.uk.com	Basildon	00968629	£91.3m Estimated	—	—	—	active
39	JOHN TURNER CONSTRUCTION GROUP LTD ltdJohnturner.co.uk	Preston	02343739	£84.8m Estimated	—	—	—	active
40	DERRY BUILDING SERVICES LIMITED ltdDerry-bs.co.uk	Newark	01481063	£80.2m Estimated	—	—	—	active
41	BRITISH GAS SOCIAL HOUSING LIMITED ltdPhjones.co.uk	Windsor	01026007	£77.7m Estimated	—	—	—	active
42	IRWIN M&E LIMITED ltdIrwinelectrical.com	Craigavon	NI036731	£76.1m Estimated	—	—	—	active
43	CENTREGREAT LIMITED ltdCentregreatengineering.co.uk	Bridgend	01169341	£75.7m Estimated	—	—	—	active
44	MAP GROUP (UK) LIMITED ltdMapgroupuk.com	Stockton-On-Tees	02853596	£75.6m Estimated	—	—	—	active
45	WINGATE ELECTRICAL PLC plcWingate.co.uk	Hampshire	01153427	£71.9m Estimated	—	—	—	active
46	BANCROFT LIMITED ltdBancroft.uk.com	London	02907123	£69.6m Estimated	—	—	—	active
47	CLARKSON EVANS LIMITED ltdClarksonevans.co.uk	Gloucester	03843351	£69.2m Estimated	—	—	—	active
48	BJF CONNECTIONS LTD ltdBjfconnections.co.uk	Maidstone	06056699	£68.5m Estimated	—	—	—	active
49	THE CASTLE BUILDING SERVICES ORGANISATION LIMITED ltdcastlebs.co.uk	Hebburn	08331581	£66.3m Estimated	—	—	—	active
50	CENTRICA BUSINESS SOLUTIONS UK LIMITED ltdEnerg-group.com	Windsor	01874716	£65.8m Estimated	—	—	—	active
51	POWERSYSTEMS UK LTD ltdPowersystemsuk.com	Bristol	01534161	£63.5m Estimated	—	—	—	active
52	UK POWER NETWORKS SERVICES (COMMERCIAL) LIMITED ltdUkpowernetworks.co.uk	London	02965182	£61.0m Estimated	—	—	—	active
53	MAYA5 LTD ltdGlostermep.co.uk	London	09371849	£60.6m Estimated	—	—	—	active
54	A&B ENGINEERING MEP LIMITED ltdAbeng.co.uk	Liverpool	14455715	£59.9m Estimated	—	—	—	active
55	OPENVIEW SECURITY SOLUTIONS LIMITED ltdOpenviewgroup.com	Essex	03376202	£59.2m Estimated	—	—	—	active
56	WHITEHEAD BUILDING SERVICES LIMITED ltdWhiteheadbs.co.uk	Newport	01394970	£58.7m Estimated	—	—	—	active
57	SMITH AND BYFORD LIMITED ltdSmithandbyford.com	Sutton	01074356	£58.5m Estimated	—	—	—	active
58	CEMA GROUP LTD ltdNottinghamcranehire.com	Nottingham	09874998	£57.9m Estimated	—	—	—	active
59	MICHAEL NUGENT LTD ltdMichaelnugent.co.uk	Co Tyrone	NI040434	£56.8m Estimated	—	—	—	active
60	MUNRO BUILDING SERVICES LIMITED ltdMunrobuildingservices.co.uk	Belper	02554373	£56.1m Estimated	—	—	—	active
61	EAST WEST GROUP LIMITED ltdChaswest.co.uk	Chelmsford	05839797	£55.3m Estimated	—	—	—	active
62	JOURNEO PLC plc21stplc.com	Ashby-De-La-Zouch	02974642	£55.0m Estimated	—	—	—	active
63	GEOFFREY ROBINSON LIMITED ltdGeoffreyrobinson.co.uk	Billingham	01042638	£53.5m Estimated	—	—	—	active
64	STOTHERS (M. & E.) LIMITED ltdStothersm-e.co.uk	Ravenhill Avenue	NI024313	£53.4m Estimated	—	—	—	active
65	HALSALL MECHANICAL & ELECTRICAL LIMITED ltdHalsall-electrical.co.uk	Cannock	03299063	£53.2m Estimated	—	—	—	active
66	DODD GROUP (EASTERN) LIMITED ltdDoddgroup.com	Shropshire	02842232	£53.2m Estimated	—	—	—	active
67	G & A BARNIE GROUP LIMITED ltdGabarnie.co.uk	United Kingdom	SC265415	£52.9m Estimated	—	—	—	active
68	ACTEMIUM UK LIMITED ltdTwyver.co.uk	Birmingham	00065493	£52.0m Estimated	—	—	—	active
69	BARLOWS (U.K.) LIMITED ltdBarlows-electrical.com	Malpas	02857344	£51.9m Estimated	—	—	—	active
70	PREMIER ELECTRICS LIMITED ltdPremierelectrics.com	Magherafelt	NI034252	£51.7m Estimated	—	—	—	active
71	C WATKINS PLUMBING LIMITED ltdWatkins-group.co.uk	Ramsgate	05399944	£50.7m Estimated	—	—	—	active
72	EAST WEST CONNECT LIMITED ltdEastwestconnect.com	Chelmsford	02321487	£50.3m Estimated	—	—	—	active
73	BRIDGES TOPCO LIMITED ltd	Radstock	13698536	£50.0m Estimated	—	—	—	active
74	BRIDGES (ELECTRICAL ENGINEERS) LIMITED ltdBridgesltd.co.uk	Midsomer Norton	02837204	£50.0m Estimated	—	—	—	active
75	EJ PARKER TECHNICAL SERVICES (CENTRAL) LTD ltdWtparker.co.uk	Staffordshire	01270585	£49.2m Estimated	—	—	—	active
76	INTEGRATED UTILITY SERVICES LIMITED ltdIus.co.uk	Newcastle Upon Tyne	02964844	£48.6m Estimated	—	—	—	active
77	HIGH VOLTAGE SYSTEMS AND SERVICES LIMITED ltdHvss.uk.com	Kettering	07413253	£48.3m Estimated	—	—	—	active
78	EMICO LIMITED ltdEmico.co	Hemel Hempstead	03385107	£47.6m Estimated	—	—	—	active
79	AMEON LIMITED ltdAmeon.co.uk	Blackpool	03167223	£45.3m Estimated	—	—	—	active
80	GLOSTER MEP LIMITED ltdGlostermep.co.uk	Tunbridge Wells	07769221	£45.2m Estimated	—	—	—	active
81	ABCA SYSTEMS LIMITED ltdAbcasystems.co.uk	Newcastle Upon Tyne	06294877	£43.6m Estimated	—	—	—	active
82	ARTIC BUILDING SERVICES LIMITED ltdArticbuildingservices.com	London	03529819	£43.1m Estimated	—	—	—	active
83	CARMEL (UK) LIMITED ltdCarmel-uk.com	Epsom	05179749	£42.7m Estimated	—	—	—	active
84	THE JAMES MERCER GROUP LIMITED ltdJamesmercergroup.co.uk	Ashton On Ribble, Preston	03917286	£42.3m Estimated	—	—	—	active
85	ARC GROUP LONDON LIMITED ltdArcgroupuk.com	Upper Edmonton	05536599	£42.1m Estimated	—	—	—	active
86	POLYTECK BUILDING SERVICES LIMITED ltdPolyteck.co.uk	London	05498728	£42.0m Estimated	—	—	—	active
87	DODD GROUP (SOUTH) LIMITED ltdDoddgroup.com	Shropshire	01486338	£41.7m Estimated	—	—	—	active
88	ANTRIM ELECTRICAL & MECHANICAL ENGINEERS LIMITED ltdAem-ltd.com	Belfast	NI029339	£41.5m Estimated	—	—	—	active
89	JOHN G. MACKINTOSH LIMITED ltdJgm.co.uk	Loanhead	SC281061	£41.0m Estimated	—	—	—	active
90	RGE SERVICES LIMITED ltdRgeservices.co.uk	Chigwell	03305853	£40.9m Estimated	—	—	—	active
91	INTEGRUM POWER ENGINEERING LTD ltdIntegrumpower.co.uk	Stockport	10956687	£40.9m Estimated	—	—	—	active
92	GUARDIAN ELECTRICAL COMPLIANCE LIMITED ltdGuardianelectrical.co.uk	Castleford	07388602	£40.2m Estimated	—	—	—	active
93	ROCK POWER CONNECTIONS LTD ltdRockpowerconnections.co.uk	London	08247808	£40.1m Estimated	—	—	—	active
94	ENVEVO LIMITED ltdEnvevo.co.uk	Glasgow	SC619434	£39.0m Estimated	—	—	—	active
95	DARKE & TAYLOR LIMITED ltdDarkeandtaylor.co.uk	Witney	00999233	£38.7m Estimated	—	—	—	active
96	IPSUM POWER (PRIVATE NETWORKS) LIMITED ltdSpec-ltd.com	Chorley	04051023	£38.3m Estimated	—	—	—	active
97	HEB GROUP UK LTD ltdHebarnes.com	Sheffield	02793873	£37.3m Estimated	—	—	—	active
98	TOTUS ENGINEERING GROUP HOLDINGS LIMITED ltdTotus.co.uk	Nr Exeter	12973605	£36.4m Estimated	—	—	—	active
99	STS DEFENCE LIMITED ltdSts-defence.com	Gosport	03193298	£35.7m Estimated	—	—	—	active
100	INTOHEAT LIMITED ltdIntoheat.co.uk	Bristol	02069640	£34.8m Estimated	—	—	—	active
101	IQA OPERATIONS GROUP LIMITED ltdIqagroup.co.uk	Edinburgh	SC235142	£34.6m Estimated	—	—	—	active
102	WYSEPOWER LIMITED ltdWysegroup.co.uk	Frodsham	05379085	£34.2m Estimated	—	—	—	active
103	VVB ENGINEERING (UK) LIMITED ltdVvb-eng.com	London	11553738	£33.8m Estimated	—	—	—	active
104	CORRIGENDA LIMITED ltdChurches.co.uk	London	03920337	£33.6m Estimated	—	—	—	active
105	SIGMA M&E LIMITED ltdRelay-electrical.co.uk	Castleford	08302195	£33.1m Estimated	—	—	—	active
106	ELITE ELECTRICAL CONTRACTING LIMITED ltdEliteelectrical.co.uk	Sutton	03790772	£31.2m Estimated	—	—	—	active
107	R B EMERSON LIMITED ltdEmersons.uk.com	Southend On Sea	00591433	£30.5m Estimated	—	—	—	active
108	TPT FIRE SYSTEMS GROUP LTD. ltdTpt-fire.co.uk	Basingstoke	05189142	£30.2m Estimated	—	—	—	active
109	STONEGROVE LTD. ltdStonegrove.co.uk	Kent	01228559	£30.2m Estimated	—	—	—	active
110	AIRA HOME UK LTD ltdAirahome.com	Stretford	14146166	£30.1m Estimated	—	—	—	active
111	SEE SERVICES LTD ltdSoutheastern.co.uk	Ilford	08854191	£29.9m Estimated	—	—	—	active
112	PAUL EARL LIMITED ltdPaulearl.co.uk	Albourne	02460613	£29.8m Estimated	—	—	—	active
113	MSL CABLING LIMITED ltdMslrecruitment.co.uk	Feltham	11913117	£29.7m Estimated	—	—	—	active
114	IMPACT DATA SOLUTIONS LIMITED ltdImpactds.com	Borehamwood	07038550	£29.5m Estimated	—	—	—	active
115	CHC GROUP LIMITED ltdChcltd.com	Co.Armagh	NI007500	£29.2m Estimated	—	—	—	active
116	SEC LIGHTING SERVICES TRADING LIMITED ltdSseenterprise.co.uk	Leeds	03267621	£29.1m Estimated	—	—	—	active
117	INTELECT (UK) LIMITED ltdIntelectuk.com	Middlesbrough	03444420	£29.1m Estimated	—	—	—	active
118	SURESERVE ENERGY SERVICES NORTH LIMITED ltdDysonenergyservices.co.uk	London	01956726	£28.7m Estimated	—	—	—	active
119	TRIPLE SOLAR LTD ltdTriplesolar.co.uk	Harlow	07556187	£28.6m Estimated	—	—	—	active
120	LASER ELECTRICAL SERVICES LIMITED ltdElectricianlondon.co.uk	Chelmsford	03510913	£28.4m Estimated	—	—	—	active
121	CEMA LIMITED ltdCemaltd.co.uk	Nottingham	02527559	£28.1m Estimated	—	—	—	active
122	ROCMEP LIMITED ltdRocelectrical.com	Crawley	05029997	£28.0m Estimated	—	—	—	active
123	CONCEPT BESPOKE INTERIORS LIMITED ltdConcept-bespoke-interiors.co.uk	Isleworth	05599090	£27.9m Estimated	—	—	—	active
124	PLATINUM FACILITIES & MAINTENANCE SERVICES LIMITED ltdPfms.co.uk	Fareham	00936149	£27.9m Estimated	—	—	—	active
125	DELATIM LIMITED ltdDelatim.co.uk	London	05475170	£27.4m Estimated	—	—	—	active
126	INFINITY RENEWABLES GROUP LTD. ltdInfinity-renewables.com	Crawley	11154487	£27.4m Estimated	—	—	—	active
127	J & J FIRE ENGINEERING LIMITED ltdJjfe.co.uk	Rossendale	15053264	£27.4m Estimated	—	—	—	active
128	J & J DESIGN LTD ltdJjsprinklers.co.uk	Rossendale	03673124	£27.4m Estimated	—	—	—	active
129	EVOENERGY LIMITED ltdEvoenergy.co.uk	Nottingham	06259559	£27.2m Estimated	—	—	—	active
130	ECO-1 ELECTRICAL SOLUTIONS LTD ltdEco-1.co.uk	Walsall	03186655	£27.2m Estimated	—	—	—	active
131	PICOW ENGINEERING LIMITED ltdPicow.co.uk	Runcorn	01466425	£27.1m Estimated	—	—	—	active
132	GRATTE BROTHERS SECURITY MANAGEMENT LIMITED ltdGratte.com	London	00350139	£26.9m Estimated	—	—	—	active
133	MPACT GROUP LTD ltdMpactbuildingservices.com	Loanhead	SC354345	£26.9m Estimated	—	—	—	active
134	CARTER ELECTRICAL SERVICES LIMITED ltdCarterelectrical.co.uk	Stoke On Trent	04288118	£26.9m Estimated	—	—	—	active
135	W.H. GOOD LIMITED ltdWhgood.co.uk	Rossendale	04528366	£26.6m Estimated	—	—	—	active
136	HARLAXTON HOLDINGS LIMITED ltdHarlaxton.com	Grantham	09438175	£26.3m Estimated	—	—	—	active
137	ROLEC SERVICES LIMITED ltdRolecserv.com	Boston	02294468	£26.2m Estimated	—	—	—	active
138	ELECTRACOM PROJECTS (UK) LTD ltdElectracomprojects.com	Burnham	06718635	£26.0m Estimated	—	—	—	active
139	IKAN PROJECTS LIMITED ltdElectracomprojects.com	Burnham	07985439	£26.0m Estimated	—	—	—	active
140	H.B.H. WOOLACOTTS LIMITED ltdHbh-woolacotts.co.uk	Cornwall.	01131322	£26.0m Estimated	—	—	—	active
141	MURPHY TECHNICAL SERVICES LIMITED ltdMurphygroup.co.uk	London	00931022	£25.8m Estimated	—	—	—	active
142	PAINE MANWARING LIMITED ltdPainemanwaring.co.uk	Worthing	02739418	£25.7m Estimated	—	—	—	active
143	PRIMECH BUILDING SERVICES LIMITED ltdPrimechservices.com	Gillingham	09400686	£25.6m Estimated	—	—	—	active
144	SKERRITT ELECTRICAL LTD. ltdSkerritts.com	Birmingham	01980263	£25.3m Estimated	—	—	—	active
145	ARC-TECH (SCOTLAND) LIMITED ltdC-c-g.co.uk	United Kingdom	SC127099	£25.0m Estimated	—	—	—	active
146	T.C & D CONSTRUCTION LTD. ltdTcdconstruction.co.uk	Swanley	05820206	£25.0m Estimated	—	—	—	active
147	A. & B. ENGINEERING (ELECTRICAL SERVICE DIVISION) LIMITED ltdAbeng.co.uk	United Kingdom	01179302	£24.8m Estimated	—	—	—	active
148	EASTGATE ENGINEERING SERVICES LTD ltdEastgateengineering.com	Stockton On Tees	10053319	£24.7m Estimated	—	—	—	active
149	KIRKMAN AND JOURDAIN LIMITED ltdKirkmanandjourdain.com	Essex	01766240	£24.6m Estimated	—	—	—	active
150	KIRKMAN AND JOURDAIN CONSTRUCTION LIMITED ltdKirkmanandjourdain.com	Waltham Abbey	11119670	£24.6m Estimated	—	—	—	active
151	JOURNEO FLEET SYSTEMS LIMITED ltd21stcenturycctv.com	Ashby-De-La-Zouch	01209516	£24.3m Estimated	—	—	—	active
152	SALUTE MISSION CRITICAL (EUROPE) LIMITED ltdKeysource.co.uk	Gatwick	03663128	£24.2m Estimated	—	—	—	active
153	SCOMAC SERVICES LTD ltdScomac.co.uk	Aldershot	03554289	£24.2m Estimated	—	—	—	active
154	SLOUGH ELECTRICITY CONTRACTS LIMITED ltdSseenterprise.co.uk	Reading	02902219	£24.0m Estimated	—	—	—	active
155	WHEELER ELECTRICAL LIMITED ltdWheelerelectrical.com	Hailsham	00801027	£23.9m Estimated	—	—	—	active
156	DPL GROUP LIMITED ltdDpl-group.co.uk	Ipswich	04162465	£23.9m Estimated	—	—	—	active
157	F B TAYLOR (CABLE CONTRACTORS) LIMITED ltdFbtaylor.co.uk	North Yorkshire	01271884	£23.7m Estimated	—	—	—	active
158	TPT FIRE PROJECTS LTD. ltdTptfire.co.uk	Basingstoke	05188030	£23.1m Estimated	—	—	—	active
159	NEIL SHACKLOCK PLUMBING AND HEATING CONTRACTORS LIMITED ltdShacklocks.com	Brierley Park Close Stanton Hill	00929449	£23.0m Estimated	—	—	—	active
160	BTU (INSTALLATION & MAINTENANCE) LIMITED ltdBtu-installation.com	Surrey	01561231	£23.0m Estimated	—	—	—	active
161	ENERGY AND SYSTEM TECHNICAL LIMITED ltdEast-solutions.co.uk	Downham Market	06996921	£22.9m Estimated	—	—	—	active
162	OAK ELECTRICAL LIMITED ltdOak-electrical.com	Castleford	03125754	£22.7m Estimated	—	—	—	active
163	HEWER FACILITIES MANAGEMENT LIMITED ltdHewerfm.co.uk	Cheltenham	05832269	£22.5m Estimated	—	—	—	active
164	DLP SERVICES (NORTHERN) LIMITED ltdDlpservices.com	Pendleton Salford	02650749	£22.4m Estimated	—	—	—	active
165	MORRISON FACILITIES SERVICES LIMITED ltdMearsgroup.co.uk	Motherwell	SC120550	£22.1m Estimated	—	—	—	active
166	NRT BUILDING SERVICES GROUP LIMITED ltdN-r-t.com	Banstead	03229578	£21.8m Estimated	—	—	—	active
167	A. & J. KEITH LIMITED ltdAjkeithltd.co.uk	Wallsend	02321244	£21.6m Estimated	—	—	—	active
168	ELECTRACT LIMITED ltdElectract.co.uk	Coalville	00479653	£21.4m Estimated	—	—	—	active
169	PMCK HOLDINGS LIMITED ltdPmkelectrical.com	Dungannon	NI650995	£21.2m Estimated	—	—	—	active
170	MORRIS LINE ENGINEERING (HOLDINGS) LIMITED ltdMorrisline.co.uk	Bridgend	11722493	£21.0m Estimated	—	—	—	active
171	BRIDGEGATE ELECTRICAL LIMITED ltdBridgegateuk.com	Maidenhead	03413028	£21.0m Estimated	—	—	—	active
172	ASHLEY & MCDONOUGH LIMITED ltdTheamgroup.co.uk	London	05426731	£20.9m Estimated	—	—	—	active
173	WEST LANCASHIRE GROUP LTD ltdWestlancsgroup.co.uk	Poulton-Le-Fylde	08132710	£20.9m Estimated	—	—	—	active
174	LLOYD MORRIS ELECTRICAL LIMITED ltdLloydmorris.co.uk	Wrexham	01185881	£20.7m Estimated	—	—	—	active
175	A C ELECTRICAL (NORTH) LIMITED ltdAcelectrical.co	Dukinfield	05704087	£20.3m Estimated	—	—	—	active
176	G.R. ELECTRICAL SERVICES LIMITED ltdGr-electrical.co.uk	Sherburn In Elmet	01845054	£20.1m Estimated	—	—	—	active
177	J.D. MCGEOWN LIMITED ltdJdmcg.co.uk	Belfast	NI014309	£19.9m Estimated	—	—	—	active
178	PWP BUILDING SERVICES LIMITED ltdPwp-ltd.co.uk	Nottingham	02827817	£19.6m Estimated	—	—	—	active
179	ILLUMINO IGNIS LIMITED ltdIlluminoignis.co.uk	Yaxley	06251415	£19.6m Estimated	—	—	—	active
180	ROBERTS & PROWSE (SWINDON) LIMITED ltdRobertsandprowse.com	Exeter	03834098	£19.6m Estimated	—	—	—	active
181	DL M & E BUILDING SERVICES LTD ltdDl-bsl.co.uk	Bolton	05633906	£19.2m Estimated	—	—	—	active
182	GB ELECTRICAL AND BUILDING SERVICES LTD ltdGbhereford.co.uk	Hereford	05392639	£19.1m Estimated	—	—	—	active
183	FIELD SYSTEMS DESIGNS LIMITED ltdFsdl.co.uk	Dorking	02892302	£19.0m Estimated	—	—	—	active
184	W.G.WIGGINTON LIMITED ltdWigginton.co.uk	Greenford	00533562	£18.9m Estimated	—	—	—	active
185	CILANTRO ENGINEERING UK LTD ltdCilantroeng.co.uk	London	07233102	£18.8m Estimated	—	—	—	active
186	JORDAN ELECTRICS LIMITED ltdJordanelectrics.com	Motherwell	SC115448	£18.6m Estimated	—	—	—	active
187	T. M. BROWNE LIMITED ltdtmbrowneltd.co.uk	Kings Lynn	04443068	£18.5m Estimated	—	—	—	active
188	EJ MUSK PROCESS SERVICES (PETERBOROUGH) LTD ltdPeme.co.uk	Warrington	02727513	£18.3m Estimated	—	—	—	active
189	THE WIGGETT GROUP LTD ltdWiggettelectrical.com	Brentwood	09644698	£18.2m Estimated	—	—	—	active
190	SHIELD MECHANICAL ELECTRICAL & FACILITIES SERVICES LTD ltdShieldenvironmental.co.uk	Bristol	09748445	£18.1m Estimated	—	—	—	active
191	ALPINE WORKS LIMITED ltdAlpineworks.co.uk	London	04412871	£17.9m Estimated	—	—	—	active
192	EJ PARKER TECHNICAL SERVICES (SCOTLAND NORTH) LTD ltdKorrie.co.uk	Inverness	SC386013	£17.9m Estimated	—	—	—	active
193	DERRY LIMITED ltdDerryltd.co.uk	Newark	04597236	£17.9m Estimated	—	—	—	active
194	GMR HENDERSON BUILDERS LTD ltdGmrhenderson.co.uk	Wick	SC337487	£17.7m Estimated	—	—	—	active
195	HARLAXTON ENGINEERING SERVICES LIMITED ltdHarlaxton.com	Grantham	03491492	£17.6m Estimated	—	—	—	active
196	AC ELECTRICAL SERVICES (NW) LTD ltdAc-elec.co.uk	Blackpool	04500487	£17.6m Estimated	—	—	—	active
197	DPS GROUP LTD ltdRoss-eng.com	Glenrothes	SC328334	£17.2m Estimated	—	—	—	active
198	WINTERS ELECTRICAL SERVICES LIMITED ltdWinterselectrical.co.uk	Crawley	02671206	£17.2m Estimated	—	—	—	active
199	GLOBAL SUBSTATION SOLUTIONS LIMITED ltdGss.eu.com	Hebburn	05727574	£17.0m Estimated	—	—	—	active
200	PERFORMANCE ELECTRICAL LIMITED ltdPerformanceelectrical.co.uk	Lancs	01404578	£17.0m Estimated	—	—	—	active
201	PERFORMANCE ELECTRICAL HOLDINGS LIMITED ltdPerformanceelectrical.co.uk	Bury	09404582	£17.0m Estimated	—	—	—	active
202	P MCK LTD ltdPmkelectrical.com	Dungannon	NI062901	£16.9m Estimated	—	—	—	active
203	AMEON UTILITIES LIMITED ltdAmeon.co.uk	Blackpool	06679409	£16.8m Estimated	—	—	—	active
204	VIABL LTD ltdAble-group.co.uk	Leigh-On-Sea	11955942	£16.8m Estimated	—	—	—	active
205	REDWORX MEP LIMITED ltd	London	15205241	£16.8m Estimated	—	—	—	active
206	NEPTUNE BUILDING SERVICES LTD ltdNeptunebs.co.uk	Gloucester	01810549	£16.7m Estimated	—	—	—	active
207	WATT ENERGY SAVER LTD ltdWattenergysaver.co.uk	Newark	07511276	£16.5m Estimated	—	—	—	active
208	GRANTS (DUFFTOWN) LIMITED ltdForsyths.com	Aberlour	SC031694	£16.4m Estimated	—	—	—	active
209	ALTITUDE SERVICES LIMITED ltdAltitudeservices.co.uk	Burnley	03350786	£16.3m Estimated	—	—	—	active
210	UK SAFETY MANAGEMENT LTD ltdUksafetymanagement.co.uk	Castleford	08817304	£16.2m Estimated	—	—	—	active
211	ALARM COMMUNICATION LIMITED ltdAcl.uk.com	London	01804961	£15.9m Estimated	—	—	—	active
212	MARCOE ENGINEERING LIMITED ltdMarcoe.co.uk	Welwyn Garden City	03754286	£15.7m Estimated	—	—	—	active
213	PARK, GATE AND COMPANY LIMITED ltdPark-gate.co.uk	Carlisle	00422148	£15.6m Estimated	—	—	—	active
214	J.A. RICHARDSON (ELECTRICAL) LIMITED ltdRichardsonelectrical.co.uk	United Kingdom	00761378	£15.1m Estimated	—	—	—	active
215	CAPRI MECHANICAL SERVICES LIMITED ltdCaprimechanical.co.uk	Essex	01160845	£15.1m Estimated	—	—	—	active
216	FIRE SYSTEMS LIMITED ltdFiresystems.co.uk	Kingston Upon Thames	02607182	£14.9m Estimated	—	—	—	active
217	NRC SERVICES LIMITED ltdNrcservices.co.uk	Sheffield	03235366	£14.9m Estimated	—	—	—	active
218	CENTRECO (UK) LIMITED ltdCentreco.co.uk	Birchwood	08844718	£14.6m Estimated	—	—	—	active
219	STS SPECIALIST TECHNICAL SERVICES UK LIMITED ltdSts-group.co.uk	Kingston Upon Thames	09904384	£14.4m Estimated	—	—	—	active
220	JOHN WRIGHT ELECTRICAL & MECHANICAL SERVICES LIMITED ltdJohnwrightelectrical.co.uk	York	03449243	£14.3m Estimated	—	—	—	active
221	JOHN WRIGHT GROUP LTD ltdJohnwrightelectrical.co.uk	York	14358724	£14.3m Estimated	—	—	—	active
222	CAREL U.K. LTD. ltdCarel.com	Chessington	03639249	£14.1m Estimated	—	—	—	active
223	KEMADA LIMITED ltdKemada.co.uk	Leeds	06654928	£13.7m Estimated	—	—	—	active
224	A.S.M. ENGINEERING LIMITED ltdAsmeng.co.uk	London	01522080	£13.3m Estimated	—	—	—	active
225	PHASE 3 CONNECTORS LTD ltdP3connectors.com	Liverpool	09858827	£13.2m Estimated	—	—	—	active
226	VALLECTRIC (HOLDINGS) LIMITED ltdVallectric.co.uk	Leeds	05846208	£12.7m Estimated	—	—	—	active
227	VALLECTRIC LIMITED ltdVallectric.co.uk	Leeds	00639416	£12.7m Estimated	—	—	—	active
228	JONES LIGHTING LTD ltdJoneslighting.co.uk	Leyland	06643355	£12.3m Estimated	—	—	—	active
229	MCTEAR CONTRACTS LIMITED ltdMctearcontracts.co.uk	Wishaw	SC309568	£12.2m Estimated	—	—	—	active
230	CENTRAL POWER LIMITED ltdCentralpower.co.uk	Altrincham	05195903	£11.8m Estimated	—	—	—	active
231	JPR MECHANICAL AND ELECTRICAL SERVICES LIMITED ltdJpr-engineering.com	Staffordshire	01087200	£11.7m Estimated	—	—	—	active
232	A COPELAND GROUP LIMITED ltdCopelandgroup.co.uk	Ashton-Under-Lyne	01176225	£10.9m Estimated	—	—	—	active
233	WRIGHT BUILD LTD. ltdWrightbuild.org.uk	Preston	01401191	£10.7m Estimated	—	—	—	active
234	BARDEN FM LIMITED ltdBardenfm.co.uk	Petersfield	06799409	£10.6m Estimated	—	—	—	active
235	ORBIT GLOBAL SOLUTIONS LIMITED ltd	Scarborough	05482698	£10.3m Estimated	—	—	—	active
236	SPOKEMEAD MAINTENANCE LIMITED ltdSpokemead.co.uk	London	05122953	£10.2m Estimated	—	—	—	active
237	MULTITECH SITE SERVICES LIMITED ltdTemporaryelectrics.com	Gt Dunmow	03595923	£10.0m Estimated	—	—	—	active
238	CLEARWAY FIRE AND SECURITY LIMITED ltdSitewatchsecurity.co.uk	London	04312828	£8.8m Estimated	—	—	—	active
239	LOVELL POWERMINSTER LIMITED ltdMorgansindallpropertyservices.com	London	01870042	£8.6m Estimated	—	—	—	active
240	TSG POWER UK LTD ltdUcpchoice.co.uk	Birmingham	08878963	£7.8m Estimated	—	—	—	active
241	RENEWABLE OIL SERVICES LIMITED ltdLonsdorfer.co.uk	North Shields	06582483	£7.7m Estimated	—	—	—	active
242	IPSUM POWER (TRYDAN) LIMITED ltdOtlltd.com	Chorley	02339189	£6.7m Estimated	—	—	—	active
243	R. DUNHAM (UK) LIMITED ltdR-dunham.co.uk	London	04552613	£6.2m Estimated	—	—	—	active
244	RENEWABLE CLEAN ENERGY LIMITED ltdAvivainvestors.com	London	07208883	£2.6m Estimated	—	—	—	active
245	FREE SOLAR (STAGE 1) LIMITED ltdIdealhomegroup.co.uk	Reading	07573455	£2.6m Estimated	—	—	—	active
246	FREE SOLAR (STAGE 2) LIMITED ltdIdealhomegroup.co.uk	London	07573467	£2.4m Estimated	—	—	—	active
247	TOGETHER ROOF ENERGY SPV LIMITED ltdTogetherhousing.co.uk	Halifax	07706436	£2.0m Estimated	—	—	—	active
248	GRIDCORE POWER LIMITED ltdLynxforecourt.co.uk	Fleet	09580353	£1.8m Estimated	—	—	—	active
249	DELATIM HOLDINGS LIMITED ltdDelatim.co.uk	London	12357197	£1.6m Estimated	—	—	—	active
250	GLOBAL RESELLERS & CONTRACTORS UK LTD ltd	London	12071076	£39k Filed accounts	—	FY2025	—	active