- Companies
- Machinery repair and installation
- Norwich
- Diamond Controls Limited
Diamond Controls Limited
- Company number
- 04113848
- Incorporated
- 24 Nov 200025 years trading
- Registered office
- 21A Bessemer Road, Norwich, NR4 6DQ
- Nature of business
- Installation of industrial machinery and equipment
Diamond Controls Limited is a 25-year-old private limited company registered in Norwich, company number 04113848, one of 153 machinery repair and installation companies in Norwich. Its next accounts are due at Companies House on 31 December 2027, and the CT600 for the period to 31 March 2027 is due at HMRC on 31 March 2028.
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 £489K (+34.3%) on the year before, to £1.9M.
- Net assets rose in 9 of 9 year-on-year comparisons on record.
- Current assets of £1.9M against £879K owed within a year: 2.1 times cover.
- 18 employees on average, down from 21 the year before.
- Balance sheets on record for 10 years, 2017 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2026 | £1.9M | £256K | £1.9M | £879K | 18 |
| 31 Mar 2025 | £1.4M | £691K | £1.5M | £1M | 21 |
| 31 Mar 2024 | £1M | £302K | £1.3M | £862K | 16 |
| 31 Mar 2023 | £901K | £478K | £1.5M | £635K | 13 |
| 31 Mar 2022 | £546K | £264K | £1.2M | £610K | 12 |
| 31 Mar 2021 | £393K | £281K | £829K | £387K | 11 |
| 31 Mar 2020 | £259K | £94K | £591K | £364K | 10 |
| 31 Mar 2019 | £223K | £64K | £693K | £514K | 14 |
| 31 Mar 2018 | £213K | £61K | £564K | £393K | 11 |
| 31 Mar 2017 | £184K | £18K | £404K | £247K | 5 |
Where Diamond Controls Limited is registered
The registered office is in Norwich (NR4), in the Norwich local authority area, East of England. Show NR4 6DQ on a map.
Other trade companies in NR4
- Spalding Projects LtdProperty developers
- Hunter & May LtdSpecialist contractors
- Rahat Motors LimitedMechanics and garages
- Vip Bin Cleaning Norfolk LtdCleaning companies
- SBC Groundworks LtdBuilders
- Milaboo LtdSpecialist contractors
- Gkroofing LtdSpecialist contractors
- Claren Motor Trade LtdMotor traders
What happens if Diamond Controls 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 December 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2028 to 31 Jan 2028 | £150 |
| 1 to 3 months late | 1 Feb 2028 to 31 Mar 2028 | £375 |
| 3 to 6 months late | 1 Apr 2028 to 30 Jun 2028 | £750 |
| More than 6 months late | From 1 Jul 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2028 | £200 |
| 3 months late | 30 Jun 2028 | another £200 |
| 6 months late | 30 Sep 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 2029 | 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
- 04113848
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 24 November 2000 (25 years ago)
- Registered office
- 21A Bessemer Road, Norwich, NR4 6DQ
- Nature of business
- Installation of industrial machinery and equipment (SIC 33200)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2026
- Last confirmation statement
- 3 December 2025
- Charges (mortgages)
- 1 outstanding of 1 registered
Filing notes for machinery repair and installation companies
Machinery repair and installation companies often carry parts stock and specialist tools, and many work on contracts that span the year end.
Similar companies in Norwich
Other active machinery repair and installation companies registered in Norwich.
- Diamond Services (Ea) Ltd2008
- Doxa Enterprises Limited2011
- DP Offshore NDT Access Ltd2024
- Dynamite Engineering Limited2024
- E-Quality Lifts Limited2023
- Edifice Fire Ltd2018
- Electech Solutions (East) Limited2004
- Electro Techs (Norfolk) Ltd2024
All machinery repair and installation companies in Norwich · All trades in Norwich · Machinery repair and installation across the UK
Frequently asked questions
When are Diamond Controls Limited's accounts due?
Diamond Controls Limited's next accounts are due at Companies House by 31 December 2027 (in 445 days), covering the period to 31 March 2027.
When is Diamond Controls Limited's CT600 due?
The CT600 for the period to 31 March 2027 is due at HMRC by 31 March 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2028.
Is Diamond Controls Limited still trading?
Diamond Controls 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 Diamond Controls Limited do?
Diamond Controls Limited is registered under Installation of industrial machinery and equipment (SIC 33200).
How old is Diamond Controls Limited?
Diamond Controls Limited was incorporated on 24 November 2000, 25 years ago.
What is the penalty if Diamond Controls 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 Diamond Controls 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.