- Companies
- Civil engineering
- Brentwood
- Simon Leigh Associates Limited
Simon Leigh Associates Limited
- Company number
- 06006331
- Incorporated
- 22 Nov 200619 years trading
- Registered office
- 2 West Way, Brentwood, Essex, CM14 4PB
- Nature of business
- Construction of other civil engineering projects n.e.c.; Management consultancy activities other than financial management
Simon Leigh Associates Limited is a 19-year-old private limited company registered in Brentwood, company number 06006331, one of 39 civil engineering contractors in Brentwood. Its next accounts are due at Companies House on 31 August 2027, and the CT600 for the period to 30 November 2026 is due at HMRC on 30 November 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 £6,993 (-14.7%) on the year before, to £40K.
- Net assets rose in 2 of 9 year-on-year comparisons on record.
- Current assets of £101K against £44K owed within a year: 2.3 times cover.
- 2 employees on average, up from 0 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 |
|---|---|---|---|---|---|
| 30 Nov 2025 | £40K | £101K | £44K | 2 | |
| 30 Nov 2024 | £47K | £116K | £42K | 0 | |
| 30 Nov 2023 | £47K | £147K | £55K | 0 | |
| 30 Nov 2022 | £41K | £124K | £25K | 0 | |
| 30 Nov 2021 | £48K | £136K | £39K | 0 | |
| 30 Nov 2020 | £27K | £96K | £122K | £56K | 2 |
| 30 Nov 2019 | £42K | £80K | £105K | £71K | 3 |
| 30 Nov 2018 | £61K | £112K | £134K | £79K | 4 |
| 30 Nov 2017 | £70K | £70K | £132K | £69K | 4 |
| 30 Nov 2016 | £93K | £120K | £156K | £68K |
Where Simon Leigh Associates Limited is registered
The registered office is in Brentwood (CM14), in the Brentwood local authority area, East of England. Show CM14 4PB on a map.
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What happens if Simon Leigh Associates 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 August 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Sep 2027 to 30 Sep 2027 | £150 |
| 1 to 3 months late | 1 Oct 2027 to 30 Nov 2027 | £375 |
| 3 to 6 months late | 1 Dec 2027 to 29 Feb 2028 | £750 |
| More than 6 months late | From 1 Mar 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Dec 2027 | £200 |
| 3 months late | 29 Feb 2028 | another £200 |
| 6 months late | 30 May 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Nov 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
- 06006331
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 22 November 2006 (19 years ago)
- Registered office
- 2 West Way, Brentwood, Essex, CM14 4PB
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
Management consultancy activities other than financial management (SIC 70229) - Year end
- 30 November (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 November 2025
- Last confirmation statement
- 6 November 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 Brentwood
Other active civil engineering contractors registered in Brentwood.
- SJ Atkins Ltd2026
- Social Lynx Limited2025
- SR Utilities Ltd2020
- Tannoureen Ltd2026
- Triplex Industrial Contractors Limited1978
- UK Line Ltd2021
- Woodman Warley Limited2025
- Xmodal Energy Limited2026
All civil engineering contractors in Brentwood · All trades in Brentwood · Civil engineering across the UK
Frequently asked questions
When are Simon Leigh Associates Limited's accounts due?
Simon Leigh Associates Limited's next accounts are due at Companies House by 31 August 2027 (in 323 days), covering the period to 30 November 2026.
When is Simon Leigh Associates Limited's CT600 due?
The CT600 for the period to 30 November 2026 is due at HMRC by 30 November 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 September 2027.
Is Simon Leigh Associates Limited still trading?
Simon Leigh Associates 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 Simon Leigh Associates Limited do?
Simon Leigh Associates Limited is registered under Construction of other civil engineering projects n.e.c. (SIC 42990); Management consultancy activities other than financial management (SIC 70229).
How old is Simon Leigh Associates Limited?
Simon Leigh Associates Limited was incorporated on 22 November 2006, 19 years ago.
What is the penalty if Simon Leigh Associates 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 Simon Leigh Associates 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.