- Companies
- Civil engineering
- Durham
- Sedg (Caergeiliog) Limited
Sedg (Caergeiliog) Limited
- Company number
- 10829184
- Incorporated
- 21 Jun 20179 years trading
- Registered office
- Russel House Mill Road, Langley Moor, Durham, DH7 8HJ
- Nature of business
- Construction of other civil engineering projects n.e.c.
Sedg (Caergeiliog) Limited is a 9-year-old private limited company registered in Durham, company number 10829184, one of 121 civil engineering contractors in Durham. Its next accounts are due at Companies House on 30 September 2027, and the CT600 for the period to 31 December 2026 is due at HMRC on 31 December 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 unchanged on the year before, at £2.
- Net assets rose in 0 of 7 year-on-year comparisons on record.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 8 years, 2018 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Dec 2025 | £2 | 0 | |||
| 31 Dec 2024 | £2 | 0 | |||
| 31 Dec 2023 | £2 | 0 | |||
| 31 Dec 2022 | £2 | 0 | |||
| 31 Dec 2021 | £2 | 0 | |||
| 31 Dec 2020 | £2 | 0 | |||
| 30 Jun 2019 | £2 | 0 | |||
| 30 Jun 2018 | £2 |
Where Sedg (Caergeiliog) Limited is registered
The registered office is in Durham (DH7), in the County Durham local authority area, North East. Show DH7 8HJ on a map.
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Also registered at this address
8 other companies use the same registered office as Sedg (Caergeiliog) Limited.
- Sirius Ecodev (Arbury) LimitedSpecialist contractors
- Sirius Ecodev (Clapham) LimitedSpecialist contractors
- Sirius Ecodev (Lambeeth Ii) LimitedSpecialist contractors
- Sirius Ecodev (Lambeeth) LimitedSpecialist contractors
- Sirius Ecodev (Meyrick) LimitedSpecialist contractors
- Sirius Ecodev (Pen Yr Heol) LtdSpecialist contractors
- Sirius Ecodev (Toronto) LimitedSpecialist contractors
- Siriusdev (Miners) LtdSpecialist contractors
What happens if Sedg (Caergeiliog) 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 September 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Oct 2027 to 31 Oct 2027 | £150 |
| 1 to 3 months late | 1 Nov 2027 to 31 Dec 2027 | £375 |
| 3 to 6 months late | 1 Jan 2028 to 31 Mar 2028 | £750 |
| More than 6 months late | From 1 Apr 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jan 2028 | £200 |
| 3 months late | 31 Mar 2028 | another £200 |
| 6 months late | 30 Jun 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Dec 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
- 10829184
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 21 June 2017 (9 years ago)
- Registered office
- Russel House Mill Road, Langley Moor, Durham, DH7 8HJ
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
- Year end
- 31 December (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 December 2025
- Last confirmation statement
- 20 June 2026
Filing notes for civil engineering contractors
Civil engineering contractors usually carry plant and machinery, so capital allowances (the annual investment allowance and the main pool) do much of the work in the corporation tax computation.
Similar companies in Durham
Other active civil engineering contractors registered in Durham.
- Site and Topo Ltd2025
- Site Waste Clearance.Com Limited2016
- SJ Todd Groundworks Ltd2018
- SL Hunter Construction Ltd2020
- SP Engineering Group Limited2026
- SPP Rail Limited2024
- Starkold Holdings Ltd2024
- Stephen Thompson Civil Engineering Ltd2016
All civil engineering contractors in Durham · All trades in Durham · Civil engineering across the UK
Frequently asked questions
When are Sedg (Caergeiliog) Limited's accounts due?
Sedg (Caergeiliog) Limited's next accounts are due at Companies House by 30 September 2027 (in 352 days), covering the period to 31 December 2026.
When is Sedg (Caergeiliog) Limited's CT600 due?
The CT600 for the period to 31 December 2026 is due at HMRC by 31 December 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 October 2027.
Is Sedg (Caergeiliog) Limited still trading?
Sedg (Caergeiliog) 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 Sedg (Caergeiliog) Limited do?
Sedg (Caergeiliog) Limited is registered under Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is Sedg (Caergeiliog) Limited?
Sedg (Caergeiliog) Limited was incorporated on 21 June 2017, 9 years ago.
What is the penalty if Sedg (Caergeiliog) 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 Sedg (Caergeiliog) 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.