- Companies
- Civil engineering
- Edinburgh
- Blackwater Divers Limited
Blackwater Divers Limited
- Company number
- SC626321
- Incorporated
- 1 Apr 20197 years trading
- Registered office
- 13-15 Morningside Drive, Edinburgh, EH10 5LZ
- Nature of business
- Construction of other civil engineering projects n.e.c.
Blackwater Divers Limited is a 7-year-old private limited company registered in Edinburgh, company number SC626321, one of 68 civil engineering contractors in Edinburgh. Its next accounts are due at Companies House on 31 December 2026, and its first CT600 is due at HMRC on 31 December 2026.
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 £144K on the year before, to £148K.
- Net assets rose in 2 of 5 year-on-year comparisons on record.
- Current assets of £705K against £571K owed within a year: 1.2 times cover.
- 2 employees on average during the year.
- Balance sheets on record for 6 years, 2020 to 2024.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Dec 2024 | £148K | £641K | £705K | £571K | 2 |
| 30 Apr 2024 | £4,611 | £87K | £385K | £395K | 2 |
| 30 Apr 2023 | £18K | £323K | £326K | £321K | 2 |
| 30 Apr 2022 | £30K | £331K | £334K | £282K | 2 |
| 30 Apr 2021 | £45K | £181K | £271K | £187K | 2 |
| 30 Apr 2020 | £2,347 | £51K | £70K | £69K | 2 |
Where Blackwater Divers Limited is registered
The registered office is in Edinburgh (EH10), in the City of Edinburgh local authority area, Scotland. Show EH10 5LZ on a map.
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Also registered at this address
14 other companies use the same registered office as Blackwater Divers Limited.
- 'Stewart Integrated Systems' LtdMachinery repair and installation
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- Central Energy Services (Edinburgh) LimitedPlumbers and heating engineers
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What happens if Blackwater Divers 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 31 December 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2027 to 31 Jan 2027 | £150 |
| 1 to 3 months late | 1 Feb 2027 to 31 Mar 2027 | £375 |
| 3 to 6 months late | 1 Apr 2027 to 30 Jun 2027 | £750 |
| More than 6 months late | From 1 Jul 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
- SC626321
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 1 April 2019 (7 years ago)
- Registered office
- 13-15 Morningside Drive, Edinburgh, EH10 5LZ
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
- Year end
- 31 December (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 December 2024
- Last confirmation statement
- 31 March 2025
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 Edinburgh
Other active civil engineering contractors registered in Edinburgh.
- Caley Water Ltd2005
- Calmech Ltd2021
- Cammo Project Management Limited2026
- Caro Contracts Ltd2016
- Ce Macdonald Ltd2025
- Central Plastics & Roofing Limited2007
- Cis Manpower Ltd2025
- Claymore Elevator Company Limited2009
All civil engineering contractors in Edinburgh · All trades in Edinburgh · Civil engineering across the UK
Frequently asked questions
When are Blackwater Divers Limited's accounts due?
Blackwater Divers Limited's next accounts are due at Companies House by 31 December 2026 (in 79 days), covering the period to 31 March 2026.
When is Blackwater Divers Limited's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 31 December 2025, due by 31 December 2026, 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 Blackwater Divers Limited still trading?
Blackwater Divers Limited is listed as active on the Companies House register (checked 13 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 Blackwater Divers Limited do?
Blackwater Divers Limited is registered under Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is Blackwater Divers Limited?
Blackwater Divers Limited was incorporated on 1 April 2019, 7 years ago.
What is the penalty if Blackwater Divers 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 Blackwater Divers Limited on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026, rechecked 13 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.