- Companies
- Installers
- Barnet
- Steel Window Service & Supplies Limited
Steel Window Service & Supplies Limited
- Company number
- 00571528
- Incorporated
- 14 Sep 195670 years trading
- Registered office
- 110 Lancaster Road, Barnet, EN4 8AL
- Nature of business
- Other construction installation
Steel Window Service & Supplies Limited is a 70-year-old private limited company registered in Barnet, company number 00571528, one of 43 installation companies (insulation, lifts, shutters and similar) in Barnet. 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 down £367K (-68.1%) on the year before, to £172K.
- Net assets rose in 5 of 9 year-on-year comparisons on record.
- Current assets of £822K against £776K owed within a year: 1.1 times cover.
- 22 employees on average during the year.
- Balance sheets on record for 10 years, 2015 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £172K | £822K | £776K | 22 | |
| 30 Sep 2023 | £540K | £7,598 | £952K | £576K | 22 |
| 30 Sep 2022 | £554K | £22K | £1.2M | £792K | 22 |
| 30 Sep 2021 | £358K | £42K | £838K | £557K | 22 |
| 30 Sep 2020 | £390K | £324K | £1.1M | £786K | 23 |
| 30 Sep 2019 | £406K | £53K | £873K | £561K | 21 |
| 30 Sep 2018 | £367K | £2,276 | £845K | £597K | 21 |
| 30 Sep 2017 | £340K | £267K | £897K | £707K | 21 |
| 30 Sep 2016 | £324K | £156K | £721K | £558K | |
| 30 Sep 2015 | £275K | £341K | £941K | £786K |
Who runs and owns Steel Window Service & Supplies Limited
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officers (2)
| Name | Role | Appointed |
|---|---|---|
| M*** H*** | Director | before Jun 1992 |
| M*** H*** | Secretary | Feb 2011 |
3 former officers
| Name | Role | Appointed | Left |
|---|---|---|---|
| A*** P*** | Secretary | Dec 2010 | |
| D*** J*** | Director | Jan 2003 | Jan 2012 |
| A*** P*** | Director | Mar 2011 |
Person with significant control
Charges (secured borrowing)
7 of 8 registered charges are outstanding. A charge is security a lender takes over a company's assets, typically for a loan, mortgage or asset finance.
| Lender | Status | Registered |
|---|---|---|
| Barclays Bank PLC | Outstanding | Dec 2016 |
| Barclays Bank PLC | Outstanding | Jul 2012 |
| Barclays Bank PLC | Outstanding | Jul 2011 |
| Technical & General Guarantee Company S.A. | Outstanding | May 2011 |
| Barclays Bank PLC | Outstanding | Jan 2011 |
| Barclays Bank PLC | Outstanding | Jul 2010 |
| Barclays Bank PLC | Outstanding | Jun 2008 |
| A private lender | Satisfied Aug 2012 | Mar 1992 |
Where Steel Window Service & Supplies Limited is registered
The registered office is in Barnet (EN4), in the Barnet local authority area, London. Show EN4 8AL on a map.
Other trade companies in EN4
- Mechanica Frequentia Calculi LtdElectricians
- Conrad Cleaning LimitedCleaning companies
- Vreto & Co LtdCleaning companies
- Reclaim Automotive UK LtdMotor traders
- We Love 500'S LimitedMechanics and garages
- Vanta Gas & Heating LtdBuilders
- T C Developments LtdProperty developers
- Xran LtdBuilders
Also registered at this address
4 other companies use the same registered office as Steel Window Service & Supplies Limited.
- BPM Project Management (Quartet Homes) LimitedProperty developers
- Mac Roofing (London) LimitedFinishing trades
- O'Neill Rendering LtdPlasterers
- Pembury Cars LtdMotor traders
What happens if Steel Window Service & Supplies 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 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
- 00571528
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 14 September 1956 (70 years ago)
- Registered office
- 110 Lancaster Road, Barnet, EN4 8AL
- Nature of business
- Other construction installation (SIC 43290)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Unaudited abridged
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 5 April 2026
- Charges (mortgages)
- 7 outstanding of 8 registered
- Previous names
- Steel Window Service and Supplies Company Limited (until 17 Nov 2015)
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 Barnet
Other active installation companies (insulation, lifts, shutters and similar) registered in Barnet.
- Stoneview Property Services Ltd2021
- The Fitters Firm Limited2013
- Trustglazing Ltd2023
- Tuda Electrical Ltd2021
- Walls Forge UK Ltd2022
- Welshwood Park Services Limited2015
- White Rabbit Maintenance Ltd2018
- 5Ally Ltd2019
All installation companies (insulation, lifts, shutters and similar) in Barnet · All trades in Barnet · Installers across the UK
Frequently asked questions
When are Steel Window Service & Supplies Limited's accounts due?
Steel Window Service & Supplies Limited's next accounts are due at Companies House by 31 December 2026 (in 79 days), covering the period to 31 March 2026.
When is Steel Window Service & Supplies Limited'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 Steel Window Service & Supplies Limited still trading?
Steel Window Service & Supplies 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 Steel Window Service & Supplies Limited do?
Steel Window Service & Supplies Limited is registered under Other construction installation (SIC 43290).
How old is Steel Window Service & Supplies Limited?
Steel Window Service & Supplies Limited was incorporated on 14 September 1956, 70 years ago.
Who runs Steel Window Service & Supplies Limited?
Steel Window Service & Supplies Limited has 1 active director. Their names and service addresses are on the Companies House register.
Who owns Steel Window Service & Supplies Limited?
One person or company has significant control of Steel Window Service & Supplies Limited: Nerja Holdings Limited (owns 75% or more of the shares).
What is the penalty if Steel Window Service & Supplies 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 Steel Window Service & Supplies 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.