- Companies
- Electricians
- Pinner
- SDL Security Ltd
SDL Security Ltd
- Company number
- 05518730
- Incorporated
- 26 Jul 200521 years trading
- Registered office
- 52 High Street, Pinner, Middx, HA5 5PW
- Nature of business
- Electrical installation; Investigation activities
SDL Security Ltd is a 21-year-old private limited company registered in Pinner, company number 05518730, one of 42 electrical contractors in Pinner. Its next accounts are due at Companies House on 28 April 2027, and the CT600 for the period to 28 July 2026 is due at HMRC on 28 July 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 £11K (+103.5%) on the year before, to £375.
- Net assets rose in 5 of 9 year-on-year comparisons on record.
- Current assets of £5,982 against £5,607 owed within a year: 1.1 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- 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 Jul 2025 | £375 | £5,982 | £5,982 | £5,607 | 0 |
| 31 Jul 2024 | -£11K | £6,905 | £7,079 | £16K | 2 |
| 31 Jul 2023 | -£21K | £18K | 2 | ||
| 31 Jul 2022 | -£26K | £0 | £561 | £22K | 2 |
| 31 Jul 2021 | -£22K | £501 | £2,997 | £17K | 2 |
| 31 Jul 2020 | -£34K | £29K | 2 | ||
| 31 Jul 2019 | -£35K | £41K | |||
| 31 Jul 2018 | -£35K | £699 | £36K | ||
| 31 Jul 2017 | -£27K | £4,809 | £33K | ||
| 31 Jul 2016 | -£24K | £3,872 | £29K |
Where SDL Security Ltd is registered
The registered office is in Pinner (HA5), in the Harrow local authority area, London. Show HA5 5PW on a map.
Other trade companies in HA5
- Elisop LtdCivil engineering
- Kite Property Management LtdBuilders
- Olivares and Hayter LtdSpecialist contractors
- Shallons Electrical LtdElectricians
- Executive Maintenance LtdFinishing trades
- Truspan LtdBuilders
- Mak Electrical Services LtdBuilders
- Bori Scaffolding LtdScaffolders
Shared registered office
35 companies on our pages use this registered office address. An address shared this widely is usually an accountant's office or a company formation agent's service address, not where the business trades from.
What happens if SDL Security 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 28 April 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 29 Apr 2027 to 28 May 2027 | £150 |
| 1 to 3 months late | 29 May 2027 to 28 Jul 2027 | £375 |
| 3 to 6 months late | 29 Jul 2027 to 28 Oct 2027 | £750 |
| More than 6 months late | From 29 Oct 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 29 Jul 2027 | £200 |
| 3 months late | 28 Oct 2027 | another £200 |
| 6 months late | 28 Jan 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 28 Jul 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
- 05518730
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 26 July 2005 (21 years ago)
- Registered office
- 52 High Street, Pinner, Middx, HA5 5PW
- Nature of business
- Electrical installation (SIC 43210)
Investigation activities (SIC 80300) - Year end
- 28 July (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 July 2025
- Last confirmation statement
- 25 July 2026
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 Pinner
Other active electrical contractors registered in Pinner.
- Sha Sha Limited2011
- Shallons Electrical Ltd2026
- Smarter Electrics Limited2022
- Thumbs Up Av Ltd2026
- Val Energy Limited2023
- Valeto Networks Ltd2011
- Voltrix Ltd2017
- Vyas Electricals Ltd2026
All electrical contractors in Pinner · All trades in Pinner · Electricians across the UK
Frequently asked questions
When are SDL Security Ltd's accounts due?
SDL Security Ltd's next accounts are due at Companies House by 28 April 2027 (in 198 days), covering the period to 28 July 2026.
When is SDL Security Ltd's CT600 due?
The CT600 for the period to 28 July 2026 is due at HMRC by 28 July 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 29 April 2027.
Is SDL Security Ltd still trading?
SDL Security 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 SDL Security Ltd do?
SDL Security Ltd is registered under Electrical installation (SIC 43210); Investigation activities (SIC 80300).
How old is SDL Security Ltd?
SDL Security Ltd was incorporated on 26 July 2005, 21 years ago.
What is the penalty if SDL Security 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 SDL Security 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.