- Companies
- Installers
- Gerrards Cross
- Critical Site Services Ltd
Critical Site Services Ltd
- Company number
- 15033185
- Incorporated
- 27 Jul 20233 years trading
- Registered office
- 15 Deanacre Close, Chalfont ST. Peter, Gerrards Cross, SL9 0NW
- Nature of business
- Other construction installation
Critical Site Services Ltd is a 3-year-old private limited company registered in Gerrards Cross, company number 15033185, one of 6 installation companies (insulation, lifts, shutters and similar) in Gerrards Cross. 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.
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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 £21K (+42.4%) on the year before, to £72K.
- Current assets of £107K against £25K owed within a year: 4.4 times cover.
- 1 employee on average, up from 0 the year before.
- Balance sheets on record for 3 years, 2024 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2026 | £72K | £107K | £25K | 1 | |
| 31 Mar 2025 | £50K | £65K | £14K | 0 | |
| 31 Mar 2024 | £27K | £35K | £7,382 | 0 |
Where Critical Site Services Ltd is registered
The registered office is in Gerrards Cross (SL9), in the Buckinghamshire local authority area, South East. Show SL9 0NW on a map.
Other trade companies in SL9
- Criss Design LtdPainters and decorators
- Lebrato Projects and Construction LtdProperty developers
- RS Rigging Services LtdSpecialist contractors
- Portstar Bristol LtdBuilders
- Budgetbuild UK LtdBuilders
- Azizi Motors LtdMotor traders
- Ashoak Group LimitedSpecialist contractors
- Hyper Cleaning Godalming LtdCleaning companies
What happens if Critical Site Services 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
- 15033185
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 27 July 2023 (3 years ago)
- Registered office
- 15 Deanacre Close, Chalfont ST. Peter, Gerrards Cross, SL9 0NW
- Nature of business
- Other construction installation (SIC 43290)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 26 July 2026
Filing notes for installation companies (insulation, lifts, shutters and similar)
Installation companies (insulation, lifts, shutters, solar and similar) often buy stock and equipment up front, so stock at the year end and capital allowances both affect the tax bill.
Similar companies in Gerrards Cross
Other active installation companies (insulation, lifts, shutters and similar) registered in Gerrards Cross.
- DB Setfix Ltd2022
- Essential Construction Services (E.C.S) Limited2013
- Khalsa Staircase Ltd2022
- MH Site Solutions Ltd2025
- Serliana Holdings Ltd2024
All installation companies (insulation, lifts, shutters and similar) in Gerrards Cross · All trades in Gerrards Cross · Installers across the UK
Frequently asked questions
When are Critical Site Services Ltd's accounts due?
Critical Site Services Ltd's next accounts are due at Companies House by 31 December 2026 (in 79 days), covering the period to 31 March 2026.
When is Critical Site Services 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 Critical Site Services Ltd still trading?
Critical Site Services 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 Critical Site Services Ltd do?
Critical Site Services Ltd is registered under Other construction installation (SIC 43290).
How old is Critical Site Services Ltd?
Critical Site Services Ltd was incorporated on 27 July 2023, 3 years ago.
What is the penalty if Critical Site Services 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 Critical Site Services 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.