- Companies
- Specialist contractors
- Aylesbury
- Onyx Basement Services Ltd
Onyx Basement Services Ltd
- Company number
- 13615988
- Incorporated
- 11 Sep 20215 years trading
- Registered office
- Nithsdale House, 159 Cambridge Street, Aylesbury, Bucks, HP20 1BQ
- Nature of business
- Other specialised construction activities n.e.c.
Onyx Basement Services Ltd is a 5-year-old private limited company registered in Aylesbury, company number 13615988, one of 85 specialist construction companies in Aylesbury. 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 down £132K (-69.8%) on the year before, to £57K.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 3 years, 2024 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2026 | £57K | £103K | 0 | ||
| 30 Sep 2025 | £189K | £473K | £308K | 2 | |
| 30 Sep 2024 | £148K | £312K | £187K | 2 |
Where Onyx Basement Services Ltd is registered
The registered office is in Aylesbury (HP20), in the Buckinghamshire local authority area, South East. Show HP20 1BQ on a map.
Other trade companies in HP20
- Fitmechs LtdMechanics and garages
- GSF Motor Parts LimitedMotor traders
- Crownvista Motors LtdMotor traders
- Vellora Property LtdProperty developers
- Thrive Valeting LtdMotor traders
- Desmil LimitedCleaning companies
- Dragon Fire Stopping LimitedInstallers
- VLD Constructions Engineering LtdBuilders
Also registered at this address
11 other companies use the same registered office as Onyx Basement Services Ltd.
- Build Scope LtdProperty developers
- Cachet Commercial & Residential LtdProperty developers
- Eldridge Plumbing and Heating LimitedPlumbers and heating engineers
- Heatify LtdPlumbers and heating engineers
- Ingram Family Builders LimitedBuilders
- JKH Plumbing and Heating UK LtdPlumbers and heating engineers
- Littlewick Homes LtdProperty developers
- Olcc (Oxon) LtdProperty developers
- Picot Utilities LtdCivil engineering
- Pipecraft Mechanical LtdPlumbers and heating engineers
- Residual Electrical LtdElectricians
What happens if Onyx Basement Services 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 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
- 13615988
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 11 September 2021 (5 years ago)
- Registered office
- Nithsdale House, 159 Cambridge Street, Aylesbury, Bucks, HP20 1BQ
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2026
- Last confirmation statement
- 9 November 2025
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
Similar companies in Aylesbury
Other active specialist construction companies registered in Aylesbury.
- Optimezz Ltd2025
- Oxford Brickwork and Masonry Limited2017
- PF Joinery Ltd2006
- R&R Building and Maintenance Services Ltd2022
- Renew Spaces Ltd2023
- Rural Reputations Ltd2022
- S.Turner Construction Ltd2022
- Sandy's Plumbing Limited2003
All specialist construction companies in Aylesbury · All trades in Aylesbury · Specialist contractors across the UK
Frequently asked questions
When are Onyx Basement Services Ltd's accounts due?
Onyx Basement Services Ltd's next accounts are due at Companies House by 31 December 2027 (in 444 days), covering the period to 31 March 2027.
When is Onyx Basement Services Ltd'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 Onyx Basement Services Ltd still trading?
Onyx Basement Services 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 Onyx Basement Services Ltd do?
Onyx Basement Services Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is Onyx Basement Services Ltd?
Onyx Basement Services Ltd was incorporated on 11 September 2021, 5 years ago.
What is the penalty if Onyx Basement Services 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 Onyx Basement Services 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.