- Companies
- Plumbers and heating engineers
- Romsey
- Semco Services Limited
Semco Services Limited
- Company number
- 03972479
- Incorporated
- 13 Apr 200026 years trading
- Registered office
- Suite 7, 2 Park Court, Premier Way, Romsey, Hampshire, SO51 9DH
- Nature of business
- Plumbing, heat and air-conditioning installation
Semco Services Limited is a 26-year-old private limited company registered in Romsey, company number 03972479, one of 17 plumbing and heating companies in Romsey. Its next accounts are due at Companies House on 30 June 2027, and the CT600 for the period to 30 September 2026 is due at HMRC on 30 September 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Finances
From each year's balance sheet filed at Companies House. Small companies do not have to publish turnover or profit, so these are balance sheet figures.
- Net assets up £60K (+51.3%) on the year before, to £177K.
- Net assets rose in 5 of 9 year-on-year comparisons on record.
- Current assets of £217K against £40K owed within a year: 5.4 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Sep 2025 | £177K | £113K | £217K | £40K | 0 |
| 30 Sep 2024 | £117K | £62K | £193K | £77K | 0 |
| 30 Sep 2023 | £57K | £85K | £119K | £62K | 3 |
| 31 Mar 2022 | £23K | £44K | £83K | £62K | 3 |
| 31 Mar 2021 | £18K | £69K | £16K | 2 | |
| 31 Mar 2020 | £26K | £55K | £6,416 | 2 | |
| 31 Mar 2019 | £27K | £83K | £30K | ||
| 31 Mar 2018 | £28K | £85K | £34K | ||
| 31 Mar 2017 | £19K | £57K | £23K | ||
| 31 Mar 2016 | £23K | £104K | £152K | £130K |
Where Semco Services Limited is registered
The registered office is in Romsey (SO51), in the Test Valley local authority area, South East. Show SO51 9DH on a map.
Other trade companies in SO51
- Automarketgroup LtdMotor traders
- Mitchells Magic LtdPainters and decorators
- Emmerdale Agriculture Online LtdLandscapers and gardeners
- McAy Sprays LtdPainters and decorators
- SB Maintenance LimitedFacilities management
- Oscar Landscaping and Building LimitedBuilders
- Haime Construction LimitedProperty developers
- Black Lake Operations LtdRoofers
Also registered at this address
14 other companies use the same registered office as Semco Services Limited.
- Dixeyclean LimitedCleaning companies
- DJB Construction South LimitedFinishing trades
- Fenwick Commercial Services LimitedSpecialist contractors
- Kievel Gas LimitedPlumbers and heating engineers
- KT Decorating LimitedFinishing trades
- Osborne Brown LimitedBuilders
- RHB Plumbing and Heating Solutions LtdPlumbers and heating engineers
- S.O. Wallace Fencing LimitedSpecialist contractors
- Say Southern Plumbing & Heating LimitedPlumbers and heating engineers
- SB Services Southampton LimitedLandscapers and gardeners
- Smart Electrical Southern LimitedElectricians
- Sparcraft Racing LimitedMachinery repair and installation
- Thomas Air Services (Tas) LtdPlumbers and heating engineers
- Victory Marine Services LimitedMachinery repair and installation
What happens if Semco Services Limited files late
Companies House charges an automatic penalty the day after the deadline, and it rises the longer the accounts are late. These are the dates for this company's accounts due on 30 June 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jul 2027 to 31 Jul 2027 | £150 |
| 1 to 3 months late | 1 Aug 2027 to 30 Sep 2027 | £375 |
| 3 to 6 months late | 1 Oct 2027 to 31 Dec 2027 | £750 |
| More than 6 months late | From 1 Jan 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Oct 2027 | £200 |
| 3 months late | 30 Dec 2027 | another £200 |
| 6 months late | 30 Mar 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Sep 2028 | another 10% of any unpaid tax |
For returns filed on or after 1 April 2026. Late three times in a row and the £200 penalties become £1,000 each.
Company details
As held on the Companies House register.
- Company number
- 03972479
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 13 April 2000 (26 years ago)
- Registered office
- Suite 7, 2 Park Court, Premier Way, Romsey, Hampshire, SO51 9DH
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 30 September (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 September 2025
- Last confirmation statement
- 14 November 2025
Filing notes for plumbing and heating companies
Plumbing and heating companies frequently work under CIS for main contractors and also directly for homeowners, so turnover can mix CIS and non-CIS income.
Similar companies in Romsey
Other active plumbing and heating companies registered in Romsey.
- Thomas Air Services (Tas) Ltd2020
- TW Plumbing and Heating Limited2019
- A&E Drainage and Plumbing Ltd2025
- Abel Environmental Services Limited1989
- Ede Plumbing & Heating Ltd2015
- Flame Installations Limited2022
- GBD Ductwork Ltd2019
- Heatwave Solutions Ltd2021
All plumbing and heating companies in Romsey · All trades in Romsey · Plumbers and heating engineers across the UK
Frequently asked questions
When are Semco Services Limited's accounts due?
Semco Services Limited's next accounts are due at Companies House by 30 June 2027 (in 261 days), covering the period to 30 September 2026.
When is Semco Services Limited's CT600 due?
The CT600 for the period to 30 September 2026 is due at HMRC by 30 September 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 July 2027.
Is Semco Services Limited still trading?
Semco Services Limited is listed as active on the Companies House register as of 1 Oct 2026. Active means it has not been dissolved or entered insolvency; it does not show whether it is currently taking on work.
What does Semco Services Limited do?
Semco Services Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Semco Services Limited?
Semco Services Limited was incorporated on 13 April 2000, 26 years ago.
What is the penalty if Semco Services Limited files its accounts late?
Companies House charges £150 if the accounts are up to 1 month late, £375 up to 3 months, £750 up to 6 months and £1,500 after that, doubled if the previous year's accounts were also late. HMRC charges £200 for a CT600 filed a day late and another £200 at 3 months.
Official records
View Semco Services Limited on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026). Deadlines are worked out from the register and assume a standard accounting period; a change of year end or a short period moves them. This page is general information, not tax or accountancy advice.