- Companies
- Electricians
- Dumbarton
- Optimumbms Ltd
Optimumbms Ltd
- Company number
- SC303086
- Incorporated
- 30 May 200620 years trading
- Registered office
- Unit 3 8 Bankend Road, Broadmeadow Industrial Estate, Dumbarton, West Dunbartonshire, G82 2RT
- Nature of business
- Electrical installation; Plumbing, heat and air-conditioning installation
Optimumbms Ltd is a 20-year-old private limited company registered in Dumbarton, company number SC303086, one of 12 electrical contractors in Dumbarton. Its next accounts are due at Companies House on 28 February 2027, and the CT600 for the period to 31 May 2026 is due at HMRC on 31 May 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 £48K (+5.2%) on the year before, to £978K.
- Net assets rose in 7 of 9 year-on-year comparisons on record.
- Current assets of £930K against £227K owed within a year: 4.1 times cover.
- 24 employees on average, up from 22 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 May 2025 | £978K | £478K | £930K | £227K | 24 |
| 31 May 2024 | £930K | £513K | £834K | £187K | 22 |
| 31 May 2023 | £825K | £378K | £757K | £174K | 24 |
| 31 May 2022 | £908K | £374K | £784K | £146K | 23 |
| 31 May 2021 | £900K | £405K | £832K | £162K | 19 |
| 31 May 2020 | £897K | £336K | £918K | £206K | 17 |
| 31 May 2019 | £938K | £311K | £995K | £228K | |
| 31 May 2018 | £930K | £419K | £992K | £170K | 13 |
| 31 May 2017 | £900K | £368K | £1M | £241K | 13 |
| 31 May 2016 | £839K | £786K | £906K | £170K |
Public contracts won
Optimumbms Ltd has one public sector contract award on record (2023). Source: Contracts Finder and Find a Tender award notices. For all of them the published figure is a shared or multi-year ceiling (a framework place, a multi-supplier award, or more than a small company could hold alone), so no value is shown. These were matched by the company's exact name because the notice gave no company number.
| Buyer | Contract | Value | Awarded |
|---|---|---|---|
| Moray Council | Building Repair and Maintenance Framework | Ceiling, not shown | 30 Jun 2023 |
Where Optimumbms Ltd is registered
The registered office is in Dumbarton (G82), in the West Dunbartonshire local authority area, Scotland. Show G82 2RT on a map.
Other trade companies in G82
- Mintedcs LtdRoofers
- RT Electrical Services Scotland LtdElectricians
- Central Heating Scotland LtdPlumbers and heating engineers
- Carberry R.H LtdMachinery repair and installation
- RGM Window Cleaning LimitedCleaning companies
- Maxwell's Air Conditioning LtdPlumbers and heating engineers
- Plasterforce LtdPlasterers
- NCL Engineering LtdCivil engineering
What happens if Optimumbms 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 February 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Mar 2027 to 31 Mar 2027 | £150 |
| 1 to 3 months late | 1 Apr 2027 to 31 May 2027 | £375 |
| 3 to 6 months late | 1 Jun 2027 to 31 Aug 2027 | £750 |
| More than 6 months late | From 1 Sep 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jun 2027 | £200 |
| 3 months late | 31 Aug 2027 | another £200 |
| 6 months late | 30 Nov 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 May 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
- SC303086
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 30 May 2006 (20 years ago)
- Registered office
- Unit 3 8 Bankend Road, Broadmeadow Industrial Estate, Dumbarton, West Dunbartonshire, G82 2RT
- Nature of business
- Electrical installation (SIC 43210)
Plumbing, heat and air-conditioning installation (SIC 43220) - Year end
- 31 May (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 May 2025
- Last confirmation statement
- 30 May 2026
- Previous names
- Optimum Electrical Services Limited (until 27 Jul 2015)
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 Dumbarton
Other active electrical contractors registered in Dumbarton.
- Rainey Electrical Ltd2018
- Robbex FM Limited2018
- RT Electrical Services Scotland Ltd2026
- Spark Electrical Scotland Limited2017
- W&L Electrical Services Ltd2018
- Alger Electrics and Alarms Limited1992
- Amphos Icp Limited2019
- Azolae Ltd2019
All electrical contractors in Dumbarton · All trades in Dumbarton · Electricians across the UK
Frequently asked questions
When are Optimumbms Ltd's accounts due?
Optimumbms Ltd's next accounts are due at Companies House by 28 February 2027 (in 139 days), covering the period to 31 May 2026.
When is Optimumbms Ltd's CT600 due?
The CT600 for the period to 31 May 2026 is due at HMRC by 31 May 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 March 2027.
Is Optimumbms Ltd still trading?
Optimumbms 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 Optimumbms Ltd do?
Optimumbms Ltd is registered under Electrical installation (SIC 43210); Plumbing, heat and air-conditioning installation (SIC 43220).
How old is Optimumbms Ltd?
Optimumbms Ltd was incorporated on 30 May 2006, 20 years ago.
Has Optimumbms Ltd won public sector contracts?
Yes. Optimumbms Ltd has one contract award from public bodies on Contracts Finder and Find a Tender, most recently from Moray Council.
What is the penalty if Optimumbms 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 Optimumbms 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.