- Companies
- Electricians
- Stevenage
- Cornerstone Security Systems Ltd
Cornerstone Security Systems Ltd
- Company number
- 07012667
- Incorporated
- 8 Sep 200917 years trading
- Registered office
- Building 16, Gateway 1000, Whittle Way, Arlington Business Park, Stevenage, Hertfordshire, SG1 2FP
- Nature of business
- Electrical installation
Cornerstone Security Systems Ltd is a 17-year-old private limited company registered in Stevenage, company number 07012667, one of 115 electrical contractors in Stevenage. Its next accounts are due at Companies House on 31 May 2027, and the CT600 for the period to 31 August 2026 is due at HMRC on 31 August 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 £250K (+71.9%) on the year before, to £597K.
- Net assets rose in 6 of 9 year-on-year comparisons on record.
- Current assets of £2.7M against £2.1M owed within a year: 1.3 times cover.
- 29 employees on average, up from 24 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 |
|---|---|---|---|---|---|
| 31 Aug 2025 | £597K | £810K | £2.7M | £2.1M | 29 |
| 31 Aug 2024 | £347K | £554K | £1.6M | £1.3M | 24 |
| 31 Aug 2023 | £246K | £204K | £1.3M | £1.2M | 27 |
| 31 Aug 2022 | £185K | £90K | £1.1M | £942K | 21 |
| 31 Aug 2021 | £161K | £95K | £893K | £768K | 20 |
| 31 Aug 2020 | £140K | £24K | £891K | £777K | 20 |
| 31 Aug 2019 | £166K | £50K | £619K | £483K | 22 |
| 31 Aug 2018 | £179K | £122K | £440K | £295K | 14 |
| 31 Aug 2017 | £159K | £22K | £643K | £505K | 14 |
| 31 Aug 2016 | £176K | £21K | £553K | £400K |
Where Cornerstone Security Systems Ltd is registered
The registered office is in Stevenage (SG1), in the Stevenage local authority area, East of England. Show SG1 2FP on a map.
Other trade companies in SG1
- Masterplumbing&Heating LtdPlumbers and heating engineers
- Ohiggins Property Solutions LtdProperty developers
- Bird Detailing LtdCleaning companies
- Tedted Engineering LtdMechanics and garages
- DSS Facilities LtdFacilities management
- Macala Engineering LimitedSpecialist contractors
- Regency Detailing LtdMechanics and garages
- Ashtons Property Group LtdProperty developers
Also registered at this address
3 other companies use the same registered office as Cornerstone Security Systems Ltd.
- Cornerstone Fire Systems LimitedElectricians
- Cornerstone Security Group (UK) LtdElectricians
- Elite Integrated Security LtdElectricians
What happens if Cornerstone Security Systems 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 May 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jun 2027 to 30 Jun 2027 | £150 |
| 1 to 3 months late | 1 Jul 2027 to 31 Aug 2027 | £375 |
| 3 to 6 months late | 1 Sep 2027 to 30 Nov 2027 | £750 |
| More than 6 months late | From 1 Dec 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Sep 2027 | £200 |
| 3 months late | 30 Nov 2027 | another £200 |
| 6 months late | 29 Feb 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Aug 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
- 07012667
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 8 September 2009 (17 years ago)
- Registered office
- Building 16, Gateway 1000, Whittle Way, Arlington Business Park, Stevenage, Hertfordshire, SG1 2FP
- Nature of business
- Electrical installation (SIC 43210)
- Year end
- 31 August (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 August 2025
- Last confirmation statement
- 29 September 2025
- Charges (mortgages)
- 0 outstanding of 1 registered
Filing notes for electrical contractors
Electrical contracting companies are often a director plus a van and tools. Most fall within the micro-entity rules, so the accounts filed at Companies House are short, and the CT600 carries the tax detail.
Similar companies in Stevenage
Other active electrical contractors registered in Stevenage.
- Crocelectrical Ltd2025
- Deans Solutions Ltd2026
- DGMS Holdings Limited2026
- DJT Electrical Installations Ltd2024
- Dot Electrical Smart Homes Ltd2020
- Easthill Faraday Limited2006
- Elecon Electrical Ltd2026
- Electric Max Ltd2025
All electrical contractors in Stevenage · All trades in Stevenage · Electricians across the UK
Frequently asked questions
When are Cornerstone Security Systems Ltd's accounts due?
Cornerstone Security Systems Ltd's next accounts are due at Companies House by 31 May 2027 (in 231 days), covering the period to 31 August 2026.
When is Cornerstone Security Systems Ltd's CT600 due?
The CT600 for the period to 31 August 2026 is due at HMRC by 31 August 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 June 2027.
Is Cornerstone Security Systems Ltd still trading?
Cornerstone Security Systems 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 Cornerstone Security Systems Ltd do?
Cornerstone Security Systems Ltd is registered under Electrical installation (SIC 43210).
How old is Cornerstone Security Systems Ltd?
Cornerstone Security Systems Ltd was incorporated on 8 September 2009, 17 years ago.
What is the penalty if Cornerstone Security Systems 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 Cornerstone Security Systems 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.