- Companies
- Finishing trades
- London
- Completion Construction Works Limited
Completion Construction Works Limited
- Company number
- 12390352
- Incorporated
- 7 Jan 20206 years trading
- Registered office
- 5 Whitehall Street, London, N17 8BP
- Nature of business
- Other building completion and finishing
Completion Construction Works Limited is a 6-year-old private limited company registered in London, company number 12390352, one of 3,947 building finishing companies in London. Its next accounts are due at Companies House on 31 October 2026, and the CT600 for the period to 31 January 2026 is due at HMRC on 31 January 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
Is this your company?
File the accounts to Companies House and the CT600 to HMRC yourself with A.X.E.L Filing. One set of questions, both filings, £49 flat. No accountant, no subscription.
File for Completion Construction Works LimitedOr get a reminder before each deadline
Free. We email you 60, 30, 14, 7 and 1 days before the accounts, CT600 and confirmation statement are due. Unsubscribe in one click.
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 £2,567 (+28.5%) on the year before, to £12K.
- Net assets rose in 3 of 5 year-on-year comparisons on record.
- Current assets of £12K against £442 owed within a year: more than 10 times cover.
- 2 employees on average during the year.
- Balance sheets on record for 6 years, 2021 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Jan 2026 | £12K | £12K | £442 | 2 | |
| 31 Jan 2025 | £9,006 | £11K | £2,092 | 2 | |
| 31 Jan 2024 | -£3,855 | £9,949 | £14K | 2 | |
| 31 Jan 2023 | -£9,234 | £7,646 | 2 | ||
| 31 Jan 2022 | -£2,603 | £7,506 | £10K | 2 | |
| 31 Jan 2021 | -£395 | £1,160 | 2 |
Where Completion Construction Works Limited is registered
The registered office is in London (N17), in the Haringey local authority area, London. Show N17 8BP on a map.
Other trade companies in N17
- JKL Building & Maintenance LtdFinishing trades
- Vas-Vent LtdSpecialist contractors
- Zbrsons LtdMotor traders
- Bally 33 LtdBuilders
- Abcd Cleaning LtdCleaning companies
- Mie Cleaning Solutions LtdCleaning companies
- Worklane LtdRoofers
- Figzu LtdCleaning companies
What happens if Completion Construction Works 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 October 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Nov 2026 to 30 Nov 2026 | £150 |
| 1 to 3 months late | 1 Dec 2026 to 31 Jan 2027 | £375 |
| 3 to 6 months late | 1 Feb 2027 to 30 Apr 2027 | £750 |
| More than 6 months late | From 1 May 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Feb 2027 | £200 |
| 3 months late | 30 Apr 2027 | another £200 |
| 6 months late | 31 Jul 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jan 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
- 12390352
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 7 January 2020 (6 years ago)
- Registered office
- 5 Whitehall Street, London, N17 8BP
- Nature of business
- Other building completion and finishing (SIC 43390)
- Year end
- 31 January (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 January 2025
- Last confirmation statement
- 31 October 2025
Filing notes for building finishing companies
Finishing trade companies cover a wide range of work. Most are micro-entities with simple accounts and a straightforward CT600.
Similar companies in London
Other active building finishing companies registered in London.
- Compliance & Maintenance Solutions Ltd2020
- Concept Construction & Supply Limited2007
- Concept Development & Investment Limited2003
- Conduct Construction Ltd2014
- Conectar Limited2014
- Confidence Cleaning Service Group Ltd2025
- Confluence Holdings Ltd2026
- Connate.Io Limited2018
All building finishing companies in London · All trades in London · Finishing trades across the UK
Frequently asked questions
When are Completion Construction Works Limited's accounts due?
Completion Construction Works Limited's next accounts are due at Companies House by 31 October 2026 (in 18 days), covering the period to 31 January 2026.
When is Completion Construction Works Limited's CT600 due?
The CT600 for the period to 31 January 2026 is due at HMRC by 31 January 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 November 2026.
Is Completion Construction Works Limited still trading?
Completion Construction Works 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 Completion Construction Works Limited do?
Completion Construction Works Limited is registered under Other building completion and finishing (SIC 43390).
How old is Completion Construction Works Limited?
Completion Construction Works Limited was incorporated on 7 January 2020, 6 years ago.
What is the penalty if Completion Construction Works 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 Completion Construction Works 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.