- Companies
- Plumbers and heating engineers
- Cambridge
- Sja Mechanical Ltd
Sja Mechanical Ltd
- Company number
- 16209807
- Incorporated
- 27 Jan 20251 year trading
- Registered office
- Future Business Centre, Kings Hedges Road, Cambridge, CB4 2HY
- Nature of business
- Plumbing, heat and air-conditioning installation
Sja Mechanical Ltd is a 1-year-old private limited company registered in Cambridge, company number 16209807, one of 105 plumbing and heating companies in Cambridge. Its next accounts are due at Companies House on 27 October 2026, and its first CT600 is due at HMRC on 26 January 2027.
Key dates
This company has not filed accounts yet. First accounts are due 21 months after incorporation, and the first period can run longer than a year.
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Where Sja Mechanical Ltd is registered
The registered office is in Cambridge (CB4), in the Cambridge local authority area, East of England. Show CB4 2HY on a map.
Other trade companies in CB4
- Until Clean LimitedCleaning companies
- Cambs Auto Bodyshop & Tyre Centre LtdMechanics and garages
- Sorted Handyman Services LtdBuilders
- GG Property Maintenance LtdSpecialist contractors
- Horaida LtdCleaning companies
- Auto Bridge Cambridge LimitedMotor traders
- Illume Systems LtdMechanics and garages
- Puffin Rigging LtdInstallers
Also registered at this address
3 other companies use the same registered office as Sja Mechanical Ltd.
- Asad Systems LtdElectricians
- Safeswitch Electrical LimitedElectricians
- TBLS Property Services LtdBuilders
What happens if Sja Mechanical Ltd 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 27 October 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 28 Oct 2026 to 27 Nov 2026 | £150 |
| 1 to 3 months late | 28 Nov 2026 to 27 Jan 2027 | £375 |
| 3 to 6 months late | 28 Jan 2027 to 27 Apr 2027 | £750 |
| More than 6 months late | From 28 Apr 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2027 | £200 |
| 3 months late | 30 Jun 2027 | another £200 |
| 6 months late | 30 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 16209807
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 27 January 2025 (1 year ago)
- Registered office
- Future Business Centre, Kings Hedges Road, Cambridge, CB4 2HY
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 March (accounting reference date)
- Accounts type
- No accounts filed yet
- Last confirmation statement
- 26 January 2026
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 Cambridge
Other active plumbing and heating companies registered in Cambridge.
- SJS Plumbing & Heating Limited2004
- Smartplumb Limited2003
- Spaxman Plumbing & Heating Ltd2012
- Speedfixplumbing Ltd2024
- Speedy Plumbing & Drain Ltd2026
- ST Ives Heating & Plumbing Limited2025
- Starling Plumbing & Heating Ltd2011
- Techmanoncall Ltd2022
All plumbing and heating companies in Cambridge · All trades in Cambridge · Plumbers and heating engineers across the UK
Frequently asked questions
When are Sja Mechanical Ltd's accounts due?
Sja Mechanical Ltd's next accounts are due at Companies House by 27 October 2026 (in 14 days), covering the period to 31 March 2026.
When is Sja Mechanical Ltd's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 26 January 2026, due by 26 January 2027, and one for the period to 31 March 2026, due by 31 March 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Sja Mechanical Ltd still trading?
Sja Mechanical Ltd 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 Sja Mechanical Ltd do?
Sja Mechanical Ltd is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Sja Mechanical Ltd?
Sja Mechanical Ltd was incorporated on 27 January 2025, 1 year ago.
What is the penalty if Sja Mechanical Ltd 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 Sja Mechanical Ltd 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.