- Companies
- Builders
- Londonderry
- SL Harkin Contracts UK Limited
SL Harkin Contracts UK Limited
- Company number
- NI693056
- Incorporated
- 7 Dec 20223 years trading
- Registered office
- 104-108 Spencer Road, Gortfoyle Business Centre, Londonderry, BT47 6AG
- Nature of business
- Construction of commercial buildings
SL Harkin Contracts UK Limited is a 3-year-old private limited company registered in Londonderry, company number NI693056, one of 95 building contractors in Londonderry. Its next accounts are due at Companies House on 30 September 2027, and the CT600 for the period to 31 December 2026 is due at HMRC on 31 December 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 down £14K (-12%) on the year before, to £104K.
- Current assets of £71K against £2,645 owed within a year: more than 10 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- Balance sheets on record for 3 years, 2023 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Dec 2025 | £104K | £14K | £71K | £2,645 | 0 |
| 31 Dec 2024 | £118K | £19K | £81K | £6,544 | 2 |
| 31 Dec 2023 | £76K | £27K | £72K | £16K | 2 |
Where SL Harkin Contracts UK Limited is registered
The registered office is in Londonderry (BT47), in the Derry City and Strabane local authority area, Northern Ireland. Show BT47 6AG on a map.
Other trade companies in BT47
- RNK Contracts LimitedGroundworks and demolition
- Den Electrical LtdElectricians
- BDK Consulting LimitedProperty developers
- Oakline Engineering LtdInstallers
- Killew Property Services LimitedFacilities management
- PH Autobody LimitedMechanics and garages
- C Doherty Autos LtdMechanics and garages
- CPMH LtdBuilders
Also registered at this address
2 other companies use the same registered office as SL Harkin Contracts UK Limited.
- D Davis Plant LimitedGroundworks and demolition
- Hco Civils LimitedCivil engineering
What happens if SL Harkin Contracts UK 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 30 September 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Oct 2027 to 31 Oct 2027 | £150 |
| 1 to 3 months late | 1 Nov 2027 to 31 Dec 2027 | £375 |
| 3 to 6 months late | 1 Jan 2028 to 31 Mar 2028 | £750 |
| More than 6 months late | From 1 Apr 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jan 2028 | £200 |
| 3 months late | 31 Mar 2028 | another £200 |
| 6 months late | 30 Jun 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Dec 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
- NI693056
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 7 December 2022 (3 years ago)
- Registered office
- 104-108 Spencer Road, Gortfoyle Business Centre, Londonderry, BT47 6AG
- Nature of business
- Construction of commercial buildings (SIC 41201)
- Year end
- 31 December (accounting reference date)
- Accounts type
- Unaudited abridged
- Last accounts made up to
- 31 December 2025
- Last confirmation statement
- 6 December 2025
Filing notes for building contractors
Building companies often run the Construction Industry Scheme as a contractor, a subcontractor or both. CIS deductions suffered during the year are set against the PAYE bill, and any unrecovered balance at the year end matters when the accounts are drawn up.
Similar companies in Londonderry
Other active building contractors registered in Londonderry.
- SM Devine Ltd2018
- Smartwall Limited2021
- SML Contracts (Derry) Limited2016
- SMM Drylining Ltd2018
- Straeview Limited2013
- Sudbury Avant Garde Developments Limited2024
- Sudbury Developments Limited2019
- Teeavan Interiors Limited2018
All building contractors in Londonderry · All trades in Londonderry · Builders across the UK
Frequently asked questions
When are SL Harkin Contracts UK Limited's accounts due?
SL Harkin Contracts UK Limited's next accounts are due at Companies House by 30 September 2027 (in 352 days), covering the period to 31 December 2026.
When is SL Harkin Contracts UK Limited's CT600 due?
The CT600 for the period to 31 December 2026 is due at HMRC by 31 December 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 October 2027.
Is SL Harkin Contracts UK Limited still trading?
SL Harkin Contracts UK 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 SL Harkin Contracts UK Limited do?
SL Harkin Contracts UK Limited is registered under Construction of commercial buildings (SIC 41201).
How old is SL Harkin Contracts UK Limited?
SL Harkin Contracts UK Limited was incorporated on 7 December 2022, 3 years ago.
What is the penalty if SL Harkin Contracts UK 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 SL Harkin Contracts UK 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.