- Companies
- Plumbers and heating engineers
- Kilmarnock
- H.K.B. Systems Limited
H.K.B. Systems Limited
- Company number
- SC094312
- Incorporated
- 16 Jul 198541 years trading
- Registered office
- 37 Portland Road, Kilmarnock, Ayrshire, KA1 2DJ
- Nature of business
- Plumbing, heat and air-conditioning installation
H.K.B. Systems Limited is a 41-year-old private limited company registered in Kilmarnock, company number SC094312, one of 45 plumbing and heating companies in Kilmarnock. 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 down £21K (-14.2%) on the year before, to £124K.
- Current assets of £241K against £153K owed within a year: 1.6 times cover.
- 12 employees on average during the year.
- Balance sheets on record for 2 years, 2024 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Aug 2025 | £124K | £104K | £241K | £153K | 12 |
| 31 Aug 2024 | £145K | £99K | £232K | £127K | 12 |
Where H.K.B. Systems Limited is registered
The registered office is in Kilmarnock (KA1), in the East Ayrshire local authority area, Scotland. Show KA1 2DJ on a map.
Other trade companies in KA1
- MM Electrical Instalations LtdElectricians
- Cornerstone Project Management LtdBuilders
- JCC.Vertex Build LtdElectricians
- Deo Property Consortium LimitedProperty developers
- Jake Robb Joinery LimitedJoiners and carpenters
- Cby Plumbing & Heating Solutions LtdPlumbers and heating engineers
- Elite Installs Scotland LtdPlumbers and heating engineers
- Elevate Joinery & Conservatory Specialist Ayrshire LimitedJoiners and carpenters
Shared registered office
27 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 H.K.B. Systems 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 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
- SC094312
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 16 July 1985 (41 years ago)
- Registered office
- 37 Portland Road, Kilmarnock, Ayrshire, KA1 2DJ
- Nature of business
- Plumbing, heat and air-conditioning installation (SIC 43220)
- Year end
- 31 August (accounting reference date)
- Accounts type
- Unaudited abridged
- Last accounts made up to
- 31 August 2025
- Last confirmation statement
- 31 January 2026
- Charges (mortgages)
- 1 outstanding of 3 registered
Filing notes for plumbing and heating companies
Plumbing and heating companies frequently work under CIS for main contractors and also directly for homeowners, so turnover can mix CIS and non-CIS income.
Similar companies in Kilmarnock
Other active plumbing and heating companies registered in Kilmarnock.
- Handsgas (Scotland) Limited2013
- Holmac Plumbing & Heating Limited2003
- Hyslop Heating and Plumbing Solutions Limited2025
- Ian Hinde Plumbing & Heating Ltd2020
- Ka3 Limited2005
- KB Heating Ltd2022
- Macfarlane Heating Services Ltd2025
- Mca Heating Solutions Ltd.2020
All plumbing and heating companies in Kilmarnock · All trades in Kilmarnock · Plumbers and heating engineers across the UK
Frequently asked questions
When are H.K.B. Systems Limited's accounts due?
H.K.B. Systems Limited's next accounts are due at Companies House by 31 May 2027 (in 230 days), covering the period to 31 August 2026.
When is H.K.B. Systems Limited'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 H.K.B. Systems Limited still trading?
H.K.B. Systems 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 H.K.B. Systems Limited do?
H.K.B. Systems Limited is registered under Plumbing, heat and air-conditioning installation (SIC 43220).
How old is H.K.B. Systems Limited?
H.K.B. Systems Limited was incorporated on 16 July 1985, 41 years ago.
What is the penalty if H.K.B. Systems 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 H.K.B. Systems 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.