- Companies
- Civil engineering
- Wokingham
- Csi Southeast Ltd
Company profile · Civil engineering
Csi Southeast Ltd
Csi Southeast Ltd is a 12-year-old private limited company registered in Wokingham, company number 08831144, one of 11 civil engineering contractors in Wokingham. Its next accounts are due at Companies House on 31 December 2026, and the CT600 for the period to 31 March 2026 is due at HMRC on 31 March 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 Csi Southeast LtdOr 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.
Financial snapshot, 2025
From the balance sheet at 31 March 2025, as filed at Companies House.
Csi Southeast Ltd over the years
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 £32K (-41.1%) on the year before, to £46K.
- Net assets rose in 5 of 9 year-on-year comparisons on record.
- Current assets of £64K against £106K owed within a year: 0.6 times cover.
- 4 employees on average, down from 5 the year before.
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £46K | £22K | £64K | £106K | 4 |
| 31 Mar 2024 | £78K | £31K | £76K | £145K | 5 |
| 31 Mar 2023 | £163K | £133K | £226K | £85K | 6 |
| 31 Mar 2022 | £97K | £65K | £175K | £67K | 7 |
| 31 Mar 2021 | £49K | £39K | £95K | £88K | 8 |
| 31 Mar 2020 | £28K | £21K | £58K | £55K | 6 |
| 31 Mar 2019 | £22K | £3,953 | £59K | £70K | |
| 31 Mar 2018 | £38K | £8,462 | £51K | £44K | |
| 31 Mar 2017 | £58K | £44K | £87K | £54K | |
| 31 Mar 2016 | £29K | £8,025 | £57K | £41K |
Where Csi Southeast Ltd is registered
The registered office is in Wokingham (RG40), in the Wokingham local authority area, South East. Show RG40 1RE on a map.
Other trade companies in RG40
- Hexdrive LtdMechanics and garages
- RM Roofing-Company LtdBuilders
- Elisha Homes LtdBuilders
- Clean Cut Locksmiths LimitedMechanics and garages
- MM Technicians LtdMechanics and garages
- Grandion Projects LtdProperty developers
- Face2Face Installs LtdElectricians
- Ventech HVAC & Engineering Services LtdMachinery repair and installation
What happens if Csi Southeast 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 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
- 08831144
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 3 January 2014 (12 years ago)
- Registered office
- 368 London Road, Wokingham, RG40 1RE
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 24 September 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 Wokingham
Other active civil engineering contractors registered in Wokingham.
- Earth Grid Ltd2015
- G.D. Contracting Ltd.2000
- HDS Civil Engineering Ltd2019
- Ian Lee Builder Limited2005
- Moon Rise Group Limited2022
- Netlink Utilities Ltd2024
- Pathway Consultants Limited2013
- Project Completion Management Services Limited2018
All civil engineering contractors in Wokingham · All trades in Wokingham · Civil engineering across the UK
Frequently asked questions
When are Csi Southeast Ltd's accounts due?
Csi Southeast Ltd's next accounts are due at Companies House by 31 December 2026 (in 80 days), covering the period to 31 March 2026.
When is Csi Southeast Ltd's CT600 due?
The CT600 for the period to 31 March 2026 is due at HMRC by 31 March 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2027.
Is Csi Southeast Ltd still trading?
Csi Southeast Ltd is listed as active on the Companies House register (checked 12 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 Csi Southeast Ltd do?
Csi Southeast Ltd is registered under Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is Csi Southeast Ltd?
Csi Southeast Ltd was incorporated on 3 January 2014, 12 years ago.
What is the penalty if Csi Southeast 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 Csi Southeast Ltd on Companies House for filed documents, officers and the full history.
Based on the Companies House register (snapshot 1 Oct 2026, rechecked 12 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.