CARTER SYNERGY LIMITED

Active
Company number 00176807Private limited companyIncorporated 1921

Key figures

£14,474,023
Net assets 2025

† CARTER SYNERGY LIMITED filed these accounts on paper, so Companies House publishes them only as a scanned image. The figures for the years marked † were read automatically from the scan and kept only where the statements add up (for example net assets equal total equity), but a reading error is still possible — check the original accounts at Companies House.

Ratios

2025

Sector comparison

SIC 33140

Where the company stands among the 4,916 active companies whose first SIC code is 33140 (Repair of electrical equipment).

Turnover£77,255,350
Higher than 96% · median £141,064 among 86 that publish turnover
Net assets£14,474,023
Higher than 99% · median £11,089
Total assets£35,358,062
Higher than 99% · median £42,292
Cash£5,121,522
Higher than 99% · median £20,825
Employees254
Higher than 99% · median 1
Company age105.2 years
Older than 99% · median 6.8 years
Largest in this sector by net assets
  1. CANADIAN SOLAR SSES (UK) LTD£31m
  2. MUIRHEAD AEROSPACE LIMITED£31m
  3. WERFEN LIMITED£22.1m
  4. DRON & DICKSON LIMITED£15.4m
  5. CARTER SYNERGY LIMITED£14.5m
  6. RES ENERGY SERVICES LIMITED£12.9m
  7. ANORD MARDIX CRITICAL POWER SERVICES LIMITED£10.7m
  8. HARTING MANUFACTURING UK LIMITED£10.3m
  9. WE POWER HOLDINGS LTD£8.3m
  10. PITTS WILSON LIMITED£8.3m

Positions are approximate. Figures come from each company's latest accounts; money and employee figures are compared only with companies that filed accounts in pounds for a period ending in the last two and a half years and are not dormant, so those groups are smaller than 4,916. The line on each bar marks the median.

Summary: CARTER SYNERGY LIMITED

What kind of company is it?

CARTER SYNERGY LIMITED is a private limited company registered with Companies House under company number 00176807. It was incorporated on 15 Sep 1921. Its status is active. The registered office is in Birmingham (B33). Its nature of business (SIC 2007) is repair of electrical equipment (33140), repair of other equipment (33190), installation of industrial machinery and equipment (33200).

How is the company doing financially?

The latest accounts in the database are for 2025 (period ending 31 Dec 2025); the company files full accounts. Turnover was £77,255,350. Profit for the year was £13,204,591. Net assets were £14,474,023. Cash at bank and in hand was £5,121,522. Total assets were £35,358,062 and total liabilities £20,884,039. The company had an average of 254 employees. Figures are available for 2 financial years (2024–2025).

How does it compare with similar companies?

Compared with 4,916 active companies whose first SIC code is 33140: By turnover it ranks higher than 96% of the 86 that publish turnover (median £141,064). By net assets it ranks higher than 99% of them (median £11,089). By total assets it ranks higher than 99% of them (median £42,292). By cash it ranks higher than 99% of them (median £20,825). By number of employees it ranks higher than 99% of them (median 1). It is older than 99% of them (median age 6.8 years).

Does it supply the public sector?

The company is named as a supplier in 11 public contract award notices from 7 public sector buyers since 2015. Contracts awarded to it alone have a combined published value of £7m. Its most frequent buyer is West Midlands Fire Service (3 contracts). 5 of the awards are shared with other suppliers, typically framework agreements.

What do public registers and reports show?

HMRC lists it as an importer of goods, mainly optical, medical and measuring instruments, electrical equipment. In its latest payment practices report it took an average of 54 days to pay suppliers, and 22% of invoices were not paid within agreed terms. Its gender pay gap report for 2025/26 shows median hourly pay for women 26.8% lower than for men. It has modern slavery statements on the government registry for 4 years.

Who runs and controls the company?

One person with significant control is registered. 1 of 8 registered charges are outstanding.

When are its next filings due?

The next accounts are due by 30 Sep 2027. The next confirmation statement is due by 7 Aug 2027.

Filed accounts2024–2025
2024 †2025 †
Turnover74,494,06177,255,350
Profit for the year893,08013,204,591
Cash at bank and in hand6,775,8345,121,522
Total assets33,044,94535,358,062
Total liabilities16,775,51320,884,039
Net assets / total equity—14,474,023
Average number of employees292254

A dash (—) means no accounts were filed for that year or the item is not in the accounts; 0 is a zero stated in the accounts. Small companies usually file only a balance sheet, so the profit and loss account is often missing.

Public contracts

11 contracts

CARTER SYNERGY LIMITED is named as a supplier in 11 public contract award notices from 7 public sector buyers since 2015. The 6 contracts awarded to it alone with a published value add up to £7m. 5 awards are shared with other suppliers and not counted in that total.

Contracts per year
Main buyers7
West Midlands Fire Service
3 contracts · £174k
NHS Wales Shared Services Partnership-Procurement Services (hosted by Velindre University…
2 contracts · £1.9m
Public Health England
2 contracts · £418k
Mid and South Essex NHS Foundation Trust
1 contract · £4.2m
Walsall Metropolitan Borough Council
1 contract · £331.1k
Contracts
  1. Air Con & HVAC (Planned & Reactive Maintenance)‡Mid and South Essex NHS Foundation Trust · £4,174,035 · runs until Mar 2029
  2. WP3804 - New Art Gallery Walsall - Maintenance Services‡Walsall Metropolitan Borough Council · £331,080
  3. Cardiff and Vale University Health Board - Local Mechanical Framework Value Uplift‡NHS Wales Shared Services Partnership-Procurement Services (hosted by Velindre University… · shared by 4 suppliers, up to £9,000,000 in total
  4. Air Handling and Air Conditioning Units Surveying‡NHS Wales Shared Services Partnership-Procurement Services (hosted by Velindre University… · £1,901,530
  5. PHE - Porton 180046 BIG Chillers‡Public Health England · £238,005
Show 6 more
  1. Boiler Refurbishment Works located at Dudley, Northfield and Willenhall Fire Stations‡West Midlands Fire and Rescue Authority · shared by 3 suppliers, up to £260,000 in total
  2. Boiler Refurbishment Works located at Dudley, Northfield and Willenhall Fire StationsWest Midlands Fire Service · shared by 3 suppliers, up to £262,000 in total
  3. PHE - Porton Down 170466 Main Chiller Upgrade‡Public Health England · £180,000
  4. Framework Agreement for Reactive Repairs‡West Midlands Fire Service · shared by 6 suppliers, up to £700,000 in total
  5. Invitation to Tender for Replacement Boilers at Various West Midlands Fire and Rescue Service Sites‡West Midlands Fire Service · £174,000
  6. Refrigeration, Air Conditioning and Process Cooling Equipment Maintenance Services and R22 Replacement‡THE UNIVERSITY OF BIRMINGHAM · shared by 2 suppliers, up to £50,000 in total

From contract award notices on Contracts Finder (since 2016) and Find a Tender (since 2021), published by the Cabinet Office under the Open Government Licence v3.0. Values are as published by the buyer and usually cover the whole contract term; the total leaves out awards shared between several suppliers, where the published figure is a ceiling for all of them, placeholder values and single figures of £1 billion or more. Notices marked ‡ do not state a company number and were linked by an exact match on the registered name. Contracts below the publication thresholds and those of devolved buyers that publish elsewhere are not included.

Statutory reporting

Payment practices1 Jan 2026 – 30 Jun 2026
Average time taken to pay invoices
54 days
Invoices not paid within agreed terms
22%
Standard payment terms
7–90 days
Member of a payment code
No
  • Within 30 days 7%
  • 31 to 60 days 52%
  • After 60 days 41%
Earlier periods (7)
Period ending
Days to pay
Within 30 days
Late
31 Dec 2025
54
11%
11%
30 Jun 2025
54
10%
13%
31 Dec 2024
53
11%
13%
30 Jun 2024
57
9%
10%
31 Dec 2023
58
9%
12%
30 Jun 2023
62
10%
15%
31 Dec 2022
55
11%
13%

View the latest report on GOV.UK

Gender pay gap2025/26
Median hourly pay
women 26.8% lower
Mean hourly pay
women 25.6% lower
Median bonus pay
women 12.5% higher
Employer size
250 to 499 employees
Lower pay quarter24.2% womenLower middle3% womenUpper middle3% womenUpper pay quarter1.5% women
Earlier years (8)
Year
Median hourly pay
Mean hourly pay
2024/25
women 30% lower
women 21% lower
2023/24
women 34.6% lower
women 24.7% lower
2022/23
women 36.5% lower
women 25.3% lower
2021/22
women 29.6% lower
women 19.3% lower
2020/21
women 34.2% lower
women 30.8% lower
2019/20
women 33.3% lower
women 32.2% lower
2018/19
women 34.7% lower
women 40.1% lower
2017/18
women 39.4% lower
women 38% lower

A positive gap means women's average hourly pay is lower than men's across the whole employer; it is not a comparison of pay for the same work. View on the Gender pay gap service

Modern slavery statements4
2023
Statement · summary on GOV.UK · group statement (CARTER THERMAL INDUSTRIES LIMITED)
2022
Statement · summary on GOV.UK · group statement (CARTER THERMAL INDUSTRIES LIMITED)
2021
Statement · summary on GOV.UK · group statement (CARTER THERMAL INDUSTRIES LIMITED)
Earlier years (1)
2020
Statement · summary on GOV.UK · group statement (CARTER THERMAL INDUSTRIES LIMITED)

Figures the company reported itself to the government's Check payment practices service, Gender pay gap service and Modern slavery statement registry (Open Government Licence v3.0). Only large companies and employers with 250 or more staff have to report, so most companies have nothing here.

Registers and licences

International trade‡

Listed by HMRC as an importer of goods in 3 of the last 12 months on record, most recently January 2026. Main goods: optical, medical and measuring instruments and electrical equipment.

From HMRC's monthly lists of importers and exporters. Traders can ask to be left off the lists, so absence does not mean a company does not trade.

Sources: Charity Commission for England and Wales, Care Quality Commission, Home Office and HM Revenue & Customs, under the Open Government Licence v3.0. Entries marked ‡ come from lists that do not state a company number and were linked by an exact match on the registered name.

History

5 events
  1. Financial year 2025 endedAccounts: turnover £77.3m, net assets £14.5m, 254 employees
  2. Financial year 2024 endedAccounts: turnover £74.5m, 292 employees
  3. Carter Thermal Industries Limited registered as a person with significant control
  4. Name changed to CARTER SYNERGY LIMITEDPreviously CARTER REFRIGERATION & RETAIL SERVICES LIMITED
  5. Company incorporatedPrivate limited company

Dates as recorded at Companies House: incorporation, name changes, officer appointments and resignations, current persons with significant control, and the end of each financial year with figures in the database. Former persons with significant control are not listed.