- Companies
- Finishing trades
- Doncaster
- Firmus Interiors Ltd
Firmus Interiors Ltd
- Company number
- 11932951
- Incorporated
- 8 Apr 20197 years trading
- Registered office
- 60 ST. Martins Avenue, Doncaster, DN5 8JB
- Nature of business
- Other building completion and finishing
Firmus Interiors Ltd is a 7-year-old private limited company registered in Doncaster, company number 11932951, one of 107 building finishing companies in Doncaster. Its next accounts are due at Companies House on 31 January 2027, and the CT600 for the period to 30 April 2026 is due at HMRC on 30 April 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 £6,401 (+8.6%) on the year before, to £81K.
- Net assets rose in 3 of 5 year-on-year comparisons on record.
- Current assets of £152K against £71K owed within a year: 2.1 times cover.
- 2 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 |
|---|---|---|---|---|---|
| 30 Apr 2025 | £81K | £146K | £152K | £71K | 2 |
| 30 Apr 2024 | £75K | £324K | £351K | £268K | 2 |
| 30 Apr 2023 | £7,082 | £43K | £103K | £76K | 2 |
| 30 Apr 2022 | -£25K | £15K | £42K | £33K | 2 |
| 30 Apr 2021 | -£14K | £43K | £60K | £29K | 2 |
| 30 Apr 2020 | £1 | 1 |
Where Firmus Interiors Ltd is registered
The registered office is in Doncaster (DN5), in the Doncaster local authority area, Yorkshire and The Humber. Show DN5 8JB on a map.
Other trade companies in DN5
- D3 Lifestyle Group LimitedMotor traders
- Thurnscoe Bungalows LimitedBuilders
- Mastercraft Roofing and Home Improvements LtdRoofers
- Just Vags LtdMechanics and garages
- Wilson Decorators (Doncaster) LtdPainters and decorators
- Surface Groundworks LimitedLandscapers and gardeners
- Vaulto Automotive Customisation LtdMechanics and garages
- GR33N Group (G3) LtdProperty developers
What happens if Firmus Interiors 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 January 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Feb 2027 to 28 Feb 2027 | £150 |
| 1 to 3 months late | 1 Mar 2027 to 30 Apr 2027 | £375 |
| 3 to 6 months late | 1 May 2027 to 31 Jul 2027 | £750 |
| More than 6 months late | From 1 Aug 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 May 2027 | £200 |
| 3 months late | 30 Jul 2027 | another £200 |
| 6 months late | 30 Oct 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Apr 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
- 11932951
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 8 April 2019 (7 years ago)
- Registered office
- 60 ST. Martins Avenue, Doncaster, DN5 8JB
- Nature of business
- Other building completion and finishing (SIC 43390)
- Year end
- 30 April (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 April 2025
- Last confirmation statement
- 27 March 2026
- Charges (mortgages)
- 0 outstanding of 1 registered
- Previous names
- Firmus UK Interiors Ltd (until 18 Apr 2019)
Filing notes for building finishing companies
Finishing trade companies cover a wide range of work. Most are micro-entities with simple accounts and a straightforward CT600.
Similar companies in Doncaster
Other active building finishing companies registered in Doncaster.
- Five Oceans Spaces Limited2014
- Fixed and Finished Ltd2025
- G J Smith Building Services Ltd2024
- Griffin Brickwork Ltd2021
- Hall Fencing Limited2006
- Handyman John Ltd2025
- Hayes Building Supplies Limited2020
- Highwind Developments Limited2026
All building finishing companies in Doncaster · All trades in Doncaster · Finishing trades across the UK
Frequently asked questions
When are Firmus Interiors Ltd's accounts due?
Firmus Interiors Ltd's next accounts are due at Companies House by 31 January 2027 (in 110 days), covering the period to 30 April 2026.
When is Firmus Interiors Ltd's CT600 due?
The CT600 for the period to 30 April 2026 is due at HMRC by 30 April 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 February 2027.
Is Firmus Interiors Ltd still trading?
Firmus Interiors 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 Firmus Interiors Ltd do?
Firmus Interiors Ltd is registered under Other building completion and finishing (SIC 43390).
How old is Firmus Interiors Ltd?
Firmus Interiors Ltd was incorporated on 8 April 2019, 7 years ago.
What is the penalty if Firmus Interiors 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 Firmus Interiors 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.