- Companies
- Civil engineering
- Sheerness
- Sullivan Mechanical Limited
Company profile · Civil engineering
Sullivan Mechanical Limited
Sullivan Mechanical Limited is a 11-year-old private limited company registered in Sheerness, company number 09458020, one of 20 civil engineering contractors in Sheerness. 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.
Is this your company?
File the accounts to Companies House and the CT600 to HMRC yourself with A.X.E.L Filing. One set of questions, both filings, £49 flat. No accountant, no subscription.
File for Sullivan Mechanical LimitedOr get a reminder before each deadline
Free. We email you 60, 30, 14, 7 and 1 days before the accounts, CT600 and confirmation statement are due. Unsubscribe in one click.
Financial snapshot, 2026
From the balance sheet at 31 March 2026, as filed at Companies House.
Sullivan Mechanical 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 down £9,606 (-97.2%) on the year before, to £280.
- Net assets rose in 3 of 9 year-on-year comparisons on record.
- Current assets of £11K against £7,880 owed within a year: 1.4 times cover.
- 3 employees on average, down from 4 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 | £280 | £4,588 | £11K | £7,880 | 3 |
| 31 Mar 2025 | £9,886 | £0 | £15K | £5,651 | 4 |
| 31 Mar 2024 | £268 | £391 | £18K | £8,347 | 3 |
| 31 Mar 2023 | £625 | £518 | £16K | £5,530 | 2 |
| 31 Mar 2022 | £671 | £63 | £15K | £3,560 | 3 |
| 31 Mar 2021 | £722 | £4,019 | £16K | £15K | 1 |
| 31 Mar 2020 | £6,089 | £906 | £7,741 | £1,773 | 1 |
| 31 Mar 2019 | £3,849 | £218 | £6,745 | £3,039 | 1 |
| 31 Mar 2018 | £8,771 | £659 | £14K | £5,579 | 1 |
| 28 Feb 2017 | £13 | £9,819 | £10K |
Where Sullivan Mechanical Limited is registered
The registered office is in Sheerness (ME12), in the Swale local authority area, South East. Show ME12 3FX on a map.
Other trade companies in ME12
- Marine-Worx LtdMachinery repair and installation
- 5LV Electrical Solutions LtdElectricians
- Pearce & Batt Garage LimitedMechanics and garages
- Access FM LtdInstallers
- All in Hand Property Services LtdCleaning companies
- Abb (Kent) LtdPlumbers and heating engineers
- Downs Plumbing & Heating S.E. LtdPlumbers and heating engineers
- Zii Best Tyres Ltd.Motor traders
What happens if Sullivan Mechanical 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
- 09458020
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 25 February 2015 (11 years ago)
- Registered office
- 4 Buttercup Avenue, Minster on Sea, Sheerness, ME12 3FX
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2026
- Last confirmation statement
- 24 February 2026
- Previous names
- Sullivans Mechanical Services Limited (until 11 Feb 2021)
Filing notes for civil engineering contractors
Civil engineering contractors usually carry plant and machinery, so capital allowances (the annual investment allowance and the main pool) do much of the work in the corporation tax computation.
Similar companies in Sheerness
Other active civil engineering contractors registered in Sheerness.
- TK Workforce Ltd2023
- V. J. Cross Construction Ltd2006
- Bastion Civil Engineering Ltd2023
- Cplex Engineering UK Ltd2023
- Esenya Limited2018
- G.S. Utility Services Ltd2026
- Hunt Design Limited2005
- M91 Civils Ltd2023
All civil engineering contractors in Sheerness · All trades in Sheerness · Civil engineering across the UK
Frequently asked questions
When are Sullivan Mechanical Limited's accounts due?
Sullivan Mechanical 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 Sullivan Mechanical 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 Sullivan Mechanical Limited still trading?
Sullivan Mechanical 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 Sullivan Mechanical Limited do?
Sullivan Mechanical Limited is registered under Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is Sullivan Mechanical Limited?
Sullivan Mechanical Limited was incorporated on 25 February 2015, 11 years ago.
What is the penalty if Sullivan Mechanical 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 Sullivan Mechanical 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.