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- Machinery repair and installation
- D A Riddoch Engineering Limited
Company profile · Machinery repair and installation
D A Riddoch Engineering Limited
D A Riddoch Engineering Limited is a 29-year-old private limited company, company number SC170505, one of the UK's machinery repair and installation companies. Its next accounts are due at Companies House on 31 August 2027, and the CT600 for the period to 30 November 2026 is due at HMRC on 30 November 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 30 November 2025, as filed at Companies House.
D A Riddoch Engineering Limited 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 up £6,835 (+2.8%) on the year before, to £250K.
- Net assets rose in 8 of 9 year-on-year comparisons on record.
- Current assets of £293K against £86K owed within a year: 3.4 times cover.
- 3 employees on average during the year.
- 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 |
|---|---|---|---|---|---|
| 30 Nov 2025 | £250K | £251K | £293K | £86K | 3 |
| 30 Nov 2024 | £243K | £209K | £250K | £68K | 3 |
| 30 Nov 2023 | £267K | £239K | £282K | £105K | 3 |
| 30 Nov 2022 | £262K | £182K | £242K | £53K | 3 |
| 30 Nov 2021 | £220K | £154K | £182K | £36K | 3 |
| 30 Nov 2020 | £208K | £149K | £211K | £38K | 3 |
| 30 Nov 2019 | £171K | £185K | £213K | £83K | 2 |
| 30 Nov 2018 | £148K | £168K | £198K | £96K | 2 |
| 30 Nov 2017 | £122K | £122K | £143K | £72K | 2 |
| 30 Nov 2016 | £110K | £118K | £145K | £71K |
Where D A Riddoch Engineering Limited is registered
The registered office is in the AB45 postcode district, in the Aberdeenshire local authority area, Scotland. Show AB45 3SS on a map.
Other trade companies in AB45
- D. Raffan Consultancy LtdSpecialist contractors
- Oakline Property Services LtdFinishing trades
- C.W. Cruickshank Roofing & Building LtdFinishing trades
- Portsoy Auto Services LtdMotor traders
- Graeme Burton Plumbing and Heating LtdPlumbers and heating engineers
- Alvah Ets LtdMachinery repair and installation
- Tiptop Roofing Nes LtdRoofers
- Watt Property Services LtdBuilders
What happens if D A Riddoch Engineering 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 August 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Sep 2027 to 30 Sep 2027 | £150 |
| 1 to 3 months late | 1 Oct 2027 to 30 Nov 2027 | £375 |
| 3 to 6 months late | 1 Dec 2027 to 29 Feb 2028 | £750 |
| More than 6 months late | From 1 Mar 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Dec 2027 | £200 |
| 3 months late | 29 Feb 2028 | another £200 |
| 6 months late | 30 May 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Nov 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
- SC170505
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 10 December 1996 (29 years ago)
- Registered office
- Crowhillock Longmanhill, Banff, AB45 3SS
- Nature of business
- Repair of other equipment (SIC 33190)
- Year end
- 30 November (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 November 2025
- Last confirmation statement
- 10 December 2025
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
Other active machinery repair and installation companies.
- Marine Diesel Services (Scotland) Ltd1997
- Turner Power Systems Limited1997
- Stewart Pipework Limited1997
- M.K. Site Services Limited1997
- Advanced Roller Doors (E.K.) Limited1997
- Total Refreshment Solutions Limited1997
- Yampower Limited1997
- Mitchell International Limited1997
Machinery repair and installation across the UK
Frequently asked questions
When are D A Riddoch Engineering Limited's accounts due?
D A Riddoch Engineering Limited's next accounts are due at Companies House by 31 August 2027 (in 323 days), covering the period to 30 November 2026.
When is D A Riddoch Engineering Limited's CT600 due?
The CT600 for the period to 30 November 2026 is due at HMRC by 30 November 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 September 2027.
Is D A Riddoch Engineering Limited still trading?
D A Riddoch Engineering 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 D A Riddoch Engineering Limited do?
D A Riddoch Engineering Limited is registered under Repair of other equipment (SIC 33190).
How old is D A Riddoch Engineering Limited?
D A Riddoch Engineering Limited was incorporated on 10 December 1996, 29 years ago.
What is the penalty if D A Riddoch Engineering 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 D A Riddoch Engineering 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.