£269k
+35%vs Jun 2024Active04017927Private limited companyLondon Colney
MAINLINE ENVIRONMENTAL SYSTEMS LIMITED
Significant control: Paul John Kenyon (25–50%), Caroline Sandra Kenyon (25–50%)
From public filings as at 31 Aug 2026; may contain errors or be out of date. Verify at Companies House · Terms
Watch this company
Get an email when Companies House records a change for Mainline Environmental Systems Limited: status, filings, accounts, officers or owners. Free.
Not live yet: alerts start by 15 December 2026. We store your email and this company number only, for these alerts. If alerts don’t launch, we tell you and delete your address. Privacy
Coming soon · product and service lists
What does Mainline Environmental Systems Limited sell?
Registered activity: Other construction installation (SIC 43290). We’re building product and service lists for UK companies. Get this one when it’s ready.
One email, only about this. If we don’t launch within 60 days we’ll tell you. Privacy
01
Summary
MAINLINE ENVIRONMENTAL SYSTEMS LIMITED is an active private limited company (company number 04017927) incorporated on 20 June 2000, registered in London Colney. Its registered activity is other construction installation (SIC 43290). Latest small accounts cover the period ending 30 June 2025, showing net assets of £269k and cash of £20k, with 1 employee on average. Net assets rose 35% on the prior period (£199k).
Peer position · net assets
By net assets it sits in the top quarter of 288 comparable companies in Hertfordshire (median £5,105, upper quartile £41k).
02
Ownership and control
- Mr Paul John Kenyon
- owns 25–50% of shares
- holds 25–50% of voting rights
- Mrs Caroline Sandra Kenyon
- owns 25–50% of shares
- holds 25–50% of voting rights
Persons with significant control hold 25% or more of shares or voting rights. Smaller shareholdings are only listed in confirmation-statement documents. Directors and secretaries: see the officers list at Companies House.
03
Key dates
- Incorporated
- 20 June 200026 yrs ago
- Next accounts due
- 30 March 2027in 154 days
- Confirmation statement due
- 4 July 2027in 250 days
Due dates are expected from Companies House filing rules; confirm on the official register before relying on them.
04
Activity
- SIC 43290
- Other construction installation
- Accounts type
- Total Exemption Full
- Size band
- MicroCompanies Act thresholds
05
Financials
£20k
+2298%vs Jun 2024Not reported
1
No changevs Jun 2024| Period end | Net assets | Cash | Debtors | Creditors <1y | Turnover | Profit | Employees |
|---|---|---|---|---|---|---|---|
| 30 June 2025 | £269k | £20k | £405k | — | — | — | 1 |
| 30 June 2024 | £199k | £832 | £347k | — | — | — | 1 |
Cash per employee£20kCash ÷ average employees
Figures as filed in iXBRL accounts at Companies House. "—" means the line was not reported in that filing.
06
Filing and accounts signals
- Net assets above zeroNet assets £268,695 at 30 June 2025
- Net assets up 10% or more on the prior period+35.1% vs prior period
- Incorporated five or more years agoIncorporated 20 June 2000
Neutral facts read from the register and filed accounts, each with its evidence. They are not a rating, a prediction or advice, and may be incomplete or out of date. How each signal is derived.
07
Timeline
- Confirmation statement duein 250 days
- Next accounts duein 154 days
- Accounts period endNet assets £269k · small accounts
- Accounts period endNet assets £199k · small accounts
- Incorporated
08
Similar companies in Hertfordshire
- KINGSWAY COMMERCIAL INTERIORS LIMITEDHertford · inc. Jan 2001
- ROL CONSTRUCTION LTDSt Albans · inc. Mar 2001
- 24 SEVEN INTERIORS LIMITEDBuntingford · inc. Aug 1999
- C.J. O'SHAUGHNESSY (BRICKWORK) LIMITEDHarpenden · inc. Jul 2001
- SHACA CONSTRUCTION LIMITEDSt. Albans · inc. Mar 2002
- R. DAVIES CONSTRUCTION LIMITEDHarpenden · inc. May 2002
All companies incorporated on 20 June 2000 · in Jun 2000.
09
Reminders for MAINLINE ENVIRONMENTAL SYSTEMS LIMITED
Get an email before each filing deadline — accounts and confirmation statement — so nothing is late.