- Companies
- Specialist contractors
- Hertford
- S.D.C 123 Ltd
S.D.C 123 Ltd
- Company number
- 16575402
- Incorporated
- 10 Jul 20251 year trading
- Registered office
- 20 Mead Lane, Hertford, SG13 7GA
- Nature of business
- Other specialised construction activities n.e.c.
S.D.C 123 Ltd is a 1-year-old private limited company registered in Hertford, company number 16575402, one of 38 specialist construction companies in Hertford. Its next accounts are due at Companies House on 10 April 2027, and its first CT600 is due at HMRC on 9 July 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 S.D.C 123 Ltd is registered
The registered office is in Hertford (SG13), in the East Hertfordshire local authority area, East of England. Show SG13 7GA on a map.
Other trade companies in SG13
- D&M Solutions LtdCleaning companies
- Greenpassionlandscapes LtdLandscapers and gardeners
- Nexum Fire & Security LimitedElectricians
- Bullrig Electrical Services LtdElectricians
- Rule One Hold LimitedCleaning companies
- Simpson and West Construction LtdBuilders
- Better Utility Services LtdCivil engineering
- Herts Caravan Services LtdMachinery repair and installation
What happens if S.D.C 123 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 10 April 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 11 Apr 2027 to 10 May 2027 | £150 |
| 1 to 3 months late | 11 May 2027 to 10 Jul 2027 | £375 |
| 3 to 6 months late | 11 Jul 2027 to 10 Oct 2027 | £750 |
| More than 6 months late | From 11 Oct 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Aug 2027 | £200 |
| 3 months late | 31 Oct 2027 | another £200 |
| 6 months late | 31 Jan 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jul 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
- 16575402
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 10 July 2025 (1 year ago)
- Registered office
- 20 Mead Lane, Hertford, SG13 7GA
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 31 July (accounting reference date)
- Accounts type
- No accounts filed yet
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
Similar companies in Hertford
Other active specialist construction companies registered in Hertford.
- SGW Carpentry Limited2014
- Shiney Box Productions Limited2007
- Steve Coleman (Timber Erectors) Limited2007
- Still Scaffolding Limited2010
- Stuart Cross Maintenance Services Limited2007
- Sustain Abilities Limited2013
- Techmed Services Limited2006
- Toro Fire and Security Limited2026
All specialist construction companies in Hertford · All trades in Hertford · Specialist contractors across the UK
Frequently asked questions
When are S.D.C 123 Ltd's accounts due?
S.D.C 123 Ltd's next accounts are due at Companies House by 10 April 2027 (in 179 days), covering the period to 31 July 2026.
When is S.D.C 123 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 9 July 2026, due by 9 July 2027, and one for the period to 31 July 2026, due by 31 July 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is S.D.C 123 Ltd still trading?
S.D.C 123 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 S.D.C 123 Ltd do?
S.D.C 123 Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is S.D.C 123 Ltd?
S.D.C 123 Ltd was incorporated on 10 July 2025, 1 year ago.
What is the penalty if S.D.C 123 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 S.D.C 123 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.