- Company number
- 15452884
- Incorporated
- 30 Jan 20242 years trading
- Registered office
- 20 Wenlock Road, London, N1 7GU
- Nature of business
- Glazing
Specialist Installation Support Ltd is a 2-year-old private limited company registered in London, company number 15452884, one of 307 glazing companies in London. Its next accounts are due at Companies House on 31 October 2026, and the CT600 for the period to 31 January 2026 is due at HMRC on 31 January 2027.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Financial snapshot, 2025
From the balance sheet at 31 January 2025, as filed at Companies House.
Who runs and owns Specialist Installation Support Ltd
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officer
| Name | Role | Appointed |
|---|---|---|
| J*** C*** | Director | Apr 2026 |
1 former officer
| Name | Role | Appointed | Left |
|---|---|---|---|
| T*** C*** | Director | Jan 2024 | Apr 2026 |
Person with significant control
Where Specialist Installation Support Ltd is registered
The registered office is in London (N1), in the Hackney local authority area, London. Show N1 7GU on a map.
Other trade companies in N1
- Tagwise LtdSpecialist contractors
- Sphere Aviation Solutions UK LtdMachinery repair and installation
- Get IT Done Builders LtdJoiners and carpenters
- Evolution Products LimitedMotor traders
- Fleetstone Trading LtdMotor traders
- Kenneth Brady LtdElectricians
- UK Import Export LtdBuilders
- Magic Door Services LimitedMachinery repair and installation
Shared registered office
1,583 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 Specialist Installation Support 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 October 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Nov 2026 to 30 Nov 2026 | £150 |
| 1 to 3 months late | 1 Dec 2026 to 31 Jan 2027 | £375 |
| 3 to 6 months late | 1 Feb 2027 to 30 Apr 2027 | £750 |
| More than 6 months late | From 1 May 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Feb 2027 | £200 |
| 3 months late | 30 Apr 2027 | another £200 |
| 6 months late | 31 Jul 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jan 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
- 15452884
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 30 January 2024 (2 years ago)
- Registered office
- 20 Wenlock Road, London, N1 7GU
- Nature of business
- Glazing (SIC 43342)
- Year end
- 31 January (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 January 2025
- Last confirmation statement
- 28 April 2026
Filing notes for glazing companies
Glazing companies often take deposits before work starts. Deposits held at the year end are a liability, not income, until the job is done.
Similar companies in London
Other active glazing companies registered in London.
- Speed Glass & Glazing Ltd2024
- Speedframe Trade Windows and Doors Ltd2022
- Spire Glazing Solutions Ltd2026
- Splashback Studio Limited2024
- Star Glazing Limited2026
- Stellar Bespoke Windows & Doors Ltd2025
- Sterling Windows Limited2005
- Suat Joinery Ltd2020
All glazing companies in London · All trades in London · Glaziers across the UK
Frequently asked questions
When are Specialist Installation Support Ltd's accounts due?
Specialist Installation Support Ltd's next accounts are due at Companies House by 31 October 2026 (in 18 days), covering the period to 31 January 2026.
When is Specialist Installation Support Ltd's CT600 due?
The CT600 for the period to 31 January 2026 is due at HMRC by 31 January 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 November 2026.
Is Specialist Installation Support Ltd still trading?
Specialist Installation Support 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 Specialist Installation Support Ltd do?
Specialist Installation Support Ltd is registered under Glazing (SIC 43342).
How old is Specialist Installation Support Ltd?
Specialist Installation Support Ltd was incorporated on 30 January 2024, 2 years ago.
Who runs Specialist Installation Support Ltd?
Specialist Installation Support Ltd has 1 active director, the longest-serving appointed in Apr 2026. Their names and service addresses are on the Companies House register.
Who owns Specialist Installation Support Ltd?
One person or company has significant control of Specialist Installation Support Ltd: an individual (owns 75% or more of the shares).
What is the penalty if Specialist Installation Support 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 Specialist Installation Support 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.