- Companies
- Installers
- Enniskillen
- Interlux Systems Ltd
Company profile · Installers
Interlux Systems Ltd
Interlux Systems Ltd is a 7-year-old private limited company registered in Enniskillen, company number NI659597, one of 16 installation companies (insulation, lifts, shutters and similar) in Enniskillen. 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.
Is this your company?
File the accounts to Companies House and the CT600 to HMRC yourself with A.X.E.L Filing. One set of questions, both filings, £49 flat. No accountant, no subscription.
File for Interlux Systems LtdOr get a reminder before each deadline
Free. We email you 60, 30, 14, 7 and 1 days before the accounts, CT600 and confirmation statement are due. Unsubscribe in one click.
Financial snapshot, 2025
From the balance sheet at 31 March 2025, as filed at Companies House.
Interlux Systems Ltd over the years
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 £44K (-29.5%) on the year before, to £106K.
- Net assets rose in 3 of 5 year-on-year comparisons on record.
- Current assets of £233K against £201K owed within a year: 1.2 times cover.
- 5 employees on average during the year.
- Balance sheets on record for 6 years, 2020 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £106K | £233K | £201K | 5 | |
| 31 Mar 2024 | £151K | £257K | £173K | 5 | |
| 31 Mar 2023 | £135K | £226K | £185K | 5 | |
| 31 Mar 2022 | £156K | £236K | £171K | 4 | |
| 31 Mar 2021 | £117K | £163K | £102K | 4 | |
| 31 Mar 2020 | £47K | £101K | £118K | 3 |
Where Interlux Systems Ltd is registered
The registered office is in Enniskillen (BT92), in the Fermanagh and Omagh local authority area, Northern Ireland. Show BT92 4FH on a map.
Other trade companies in BT92
- Burrow Civil & Marine NI LtdCivil engineering
- PGG Commercials LtdMechanics and garages
- RH Contracts LtdLandscapers and gardeners
- TDM Contracts LimitedCivil engineering
- LR Tyres LtdMotor traders
- CS Block Work LimitedProperty developers
- Scaffweld LimitedSpecialist contractors
- Logue Bricklaying LtdBuilders
What happens if Interlux 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 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
- NI659597
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 8 March 2019 (7 years ago)
- Registered office
- 49 Main Street, Kinawley, Enniskillen, BT92 4FH
- Nature of business
- Other construction installation (SIC 43290)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 7 March 2026
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 Enniskillen
Other active installation companies (insulation, lifts, shutters and similar) registered in Enniskillen.
- Maxim Pop Limited2013
- McAndrews Construction Ltd2025
- McGrath Stone & Masonry Limited2022
- PFC Contracts NI Limited2023
- Rockview Engineers Limited2020
- Shadesofamaezin Ltd2023
- Atbec Renewables Ltd2022
- Best Choice Door Fitting Ltd2022
All installation companies (insulation, lifts, shutters and similar) in Enniskillen · All trades in Enniskillen · Installers across the UK
Frequently asked questions
When are Interlux Systems Ltd's accounts due?
Interlux Systems Ltd's next accounts are due at Companies House by 31 December 2026 (in 80 days), covering the period to 31 March 2026.
When is Interlux Systems Ltd'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 Interlux Systems Ltd still trading?
Interlux 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 Interlux Systems Ltd do?
Interlux Systems Ltd is registered under Other construction installation (SIC 43290).
How old is Interlux Systems Ltd?
Interlux Systems Ltd was incorporated on 8 March 2019, 7 years ago.
What is the penalty if Interlux 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 Interlux 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.