- Companies
- Civil engineering
- London
- Dem Infrastructure Engineering Ltd
Dem Infrastructure Engineering Ltd
- Company number
- 11859068
- Incorporated
- 4 Mar 20197 years trading
- Registered office
- 101 New Cavendish Street, 1ST Floor South, London, W1W 6XH
- Nature of business
- Construction of railways and underground railways; Construction of other civil engineering projects n.e.c.; Passenger rail transport, interurban; Urban and suburban passenger railway transportation by underground, metro and similar systems
Dem Infrastructure Engineering Ltd is a 7-year-old private limited company registered in London, company number 11859068, one of 1,853 civil engineering contractors in London. Its next accounts are due at Companies House on 28 February 2027, and the CT600 for the period to 30 May 2026 is due at HMRC on 30 May 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 down £2,712 (-83.1%) on the year before, to £553.
- Net assets rose in 3 of 5 year-on-year comparisons on record.
- Current assets of £28K against £28K owed within a year: 1.0 times cover.
- 2 employees on average during the year.
- Balance sheets on record for 6 years, 2020 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 May 2025 | £553 | £18K | £28K | £28K | 2 |
| 31 May 2024 | £3,265 | £19K | £19K | £16K | 2 |
| 31 May 2023 | -£243 | £315 | £3,916 | £5,323 | 2 |
| 31 May 2022 | £23K | £39K | £40K | £19K | 2 |
| 31 May 2021 | £21K | £42K | £42K | £21K | 2 |
| 31 May 2020 | £17K | £49K | £49K | £32K | 2 |
Where Dem Infrastructure Engineering Ltd is registered
The registered office is in London (W1W), in the Westminster local authority area, London. Show W1W 6XH on a map.
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Shared registered office
152 companies on our pages use this registered office address. An address shared this widely is usually an accountant's office or a company formation agent's service address, not where the business trades from.
What happens if Dem Infrastructure Engineering 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 28 February 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Mar 2027 to 31 Mar 2027 | £150 |
| 1 to 3 months late | 1 Apr 2027 to 31 May 2027 | £375 |
| 3 to 6 months late | 1 Jun 2027 to 31 Aug 2027 | £750 |
| More than 6 months late | From 1 Sep 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 31 May 2027 | £200 |
| 3 months late | 30 Aug 2027 | another £200 |
| 6 months late | 30 Nov 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 May 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
- 11859068
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 4 March 2019 (7 years ago)
- Registered office
- 101 New Cavendish Street, 1ST Floor South, London, W1W 6XH
- Nature of business
- Construction of railways and underground railways (SIC 42120)
Construction of other civil engineering projects n.e.c. (SIC 42990)
Passenger rail transport, interurban (SIC 49100)
Urban and suburban passenger railway transportation by underground, metro and similar systems (SIC 49311) - Year end
- 30 May (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 May 2025
- Last confirmation statement
- 3 March 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 London
Other active civil engineering contractors registered in London.
- Demirel Facade Design and Management Ltd2019
- Demon Ltd2015
- Dengie Marshes Wind Farm Limited2024
- Deris Service Ltd2022
- Derluk Limited2022
- Design Concept Construction Services Limited2014
- Designembassy Limited2003
- Desops Limited2021
All civil engineering contractors in London · All trades in London · Civil engineering across the UK
Frequently asked questions
When are Dem Infrastructure Engineering Ltd's accounts due?
Dem Infrastructure Engineering Ltd's next accounts are due at Companies House by 28 February 2027 (in 139 days), covering the period to 30 May 2026.
When is Dem Infrastructure Engineering Ltd's CT600 due?
The CT600 for the period to 30 May 2026 is due at HMRC by 30 May 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 March 2027.
Is Dem Infrastructure Engineering Ltd still trading?
Dem Infrastructure Engineering 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 Dem Infrastructure Engineering Ltd do?
Dem Infrastructure Engineering Ltd is registered under Construction of railways and underground railways (SIC 42120); Construction of other civil engineering projects n.e.c. (SIC 42990); Passenger rail transport, interurban (SIC 49100); Urban and suburban passenger railway transportation by underground, metro and similar systems (SIC 49311).
How old is Dem Infrastructure Engineering Ltd?
Dem Infrastructure Engineering Ltd was incorporated on 4 March 2019, 7 years ago.
What is the penalty if Dem Infrastructure Engineering 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 Dem Infrastructure Engineering 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.