£8,944
+19%vs Sept 2024Active04808124Private limited companyLondon
N21 BUILDING LTD
Significant control: Anthony John Cassidy (25–50%), Sharon Cassidy (25–50%)
From public filings as at 31 Aug 2026; may contain errors or be out of date. Verify at Companies House · Terms
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What does N21 Building Ltd sell?
Registered activity: Construction of other civil engineering projects n.e.c. (SIC 42990). We’re building product and service lists for UK companies. Get this one when it’s ready.
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01
Summary
N21 BUILDING LTD is an active private limited company (company number 04808124) incorporated on 23 June 2003, registered in London. Its registered activity is construction of other civil engineering projects n.e.c. (SIC 42990). Latest micro accounts cover the period ending 30 September 2025, showing net assets of £8,944, with 7 employees on average. As micro-entity accounts, no profit and loss account is filed, so turnover and profit are not public. Net assets rose 19% on the prior period (£7,499).
Peer position · net assets
By net assets it sits in the upper half of 832 comparable companies in London (median £5,799, upper quartile £58k).
02
Ownership and control
- Mr Anthony John Cassidy
- owns 25–50% of shares
- holds 25–50% of voting rights
- Mrs Sharon Cassidy
- owns 25–50% of shares
- holds 25–50% of voting rights
- Mr Paul Charles Koppi
- has significant influence or control
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
- 23 June 200323 yrs ago
- Next accounts due
- 30 June 2027in 249 days
- Confirmation statement due
- 7 July 2027in 256 days
Due dates are expected from Companies House filing rules; confirm on the official register before relying on them.
04
Activity
- SIC 42990
- Construction of other civil engineering projects n.e.c.
- Accounts type
- Micro Entity
- Size band
- MicroCompanies Act thresholds
05
Financials
Not reported
Not disclosed
7
−12%vs Sept 2024| Period end | Net assets | Cash | Debtors | Creditors <1y | Turnover | Profit | Employees |
|---|---|---|---|---|---|---|---|
| 30 September 2025 | £8,944 | — | — | — | — | — | 7 |
| 30 September 2024 | £7,499 | — | — | — | — | — | 8 |
Figures as filed in iXBRL accounts at Companies House. "—" means the line was not reported in that filing; micro-entity accounts contain no profit and loss account.
06
Filing and accounts signals
- Net assets above zeroNet assets £8,944 at 30 September 2025
- Net assets up 10% or more on the prior period+19.3% vs prior period
- Incorporated five or more years agoIncorporated 23 June 2003
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 256 days
- Next accounts duein 249 days
- Accounts period endNet assets £8,944 · micro accounts
- Accounts period endNet assets £7,499 · micro accounts
- Incorporated
08
Similar companies in London
- CTORI HOLDINGS LIMITEDLondon · inc. Jun 2003
- A.S.K. HOME IMPROVEMENTS LIMITEDLondon · inc. May 2003
- PARAMOUNT CONSTRUCTION (UK) LIMITEDLondon · inc. Apr 2003
- GORGEOUS BROTHERS ROOFING LIMITEDLondon · inc. Mar 2003
- MENDICK WARING LIMITEDLondon · inc. Mar 2003
- DESIGNEMBASSY LIMITEDLondon · inc. Oct 2003
All companies incorporated on 23 June 2003 · in Jun 2003.
09
Reminders for N21 BUILDING LTD
Get an email before each filing deadline — accounts and confirmation statement — so nothing is late.