- Companies
- Builders
- Castlewellan
- Mark Gallagher Building Ltd
Mark Gallagher Building Ltd
- Company number
- NI678459
- Incorporated
- 14 Apr 20215 years trading
- Registered office
- 16 Upper Square, Castlewellan, BT31 9DD
- Nature of business
- Construction of domestic buildings
Mark Gallagher Building Ltd is a 5-year-old private limited company registered in Castlewellan, company number NI678459, one of 29 building contractors in Castlewellan. Its next accounts are due at Companies House on 31 January 2028, and the CT600 for the period to 30 April 2027 is due at HMRC on 30 April 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 up £1,009 (+2.1%) on the year before, to £49K.
- Net assets rose in 2 of 4 year-on-year comparisons on record.
- Current assets of £103K against £63K owed within a year: 1.6 times cover.
- 1 employee on average during the year.
- Balance sheets on record for 5 years, 2022 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Apr 2026 | £49K | £103K | £63K | 1 | |
| 30 Apr 2025 | £48K | £58K | £21K | 1 | |
| 30 Apr 2024 | £60K | £129K | £84K | 0 | |
| 30 Apr 2023 | £77K | £116K | £56K | 0 | |
| 30 Apr 2022 | £50K | £69K | £42K | 1 |
Where Mark Gallagher Building Ltd is registered
The registered office is in Castlewellan (BT31), in the Newry, Mourne and Down local authority area, Northern Ireland. Show BT31 9DD on a map.
Other trade companies in BT31
- Ogm26 LtdGroundworks and demolition
- Treadline Tyre & Auto Services LtdMechanics and garages
- CB Fire Compliance LimitedSpecialist contractors
- Cea Joinery LtdJoiners and carpenters
- NI.CBR LtdMechanics and garages
- S.D.E Electrical Systems LtdElectricians
- Jam Civils & Utilities LtdGroundworks and demolition
- B McVeigh Mechanical LtdPlumbers and heating engineers
Also registered at this address
18 other companies use the same registered office as Mark Gallagher Building Ltd.
- Agd Plumbing & Heating LtdPlumbers and heating engineers
- B R Building & Joinery LimitedFinishing trades
- Cea Joinery LtdJoiners and carpenters
- Cisco Plumbing & Heating LtdPlumbers and heating engineers
- Clonkeel Joinery LtdProperty developers
- CMC Surfacing & Groundwork LtdBuilders
- Construction Sealants (Ireland) LtdSpecialist contractors
- Echo Direct Construction LtdBuilders
- Jam Civils & Utilities LtdGroundworks and demolition
- Kelly New Homes LimitedBuilders
- KP Civil LtdGroundworks and demolition
- Matthews Electrical Services (N.I.) LimitedElectricians
- MJD Building LtdBuilders
- Morgan Plumbing Services LtdPlumbers and heating engineers
- PDM Plumbing Services LtdPlumbers and heating engineers
- RW Carpentry & Construction LtdJoiners and carpenters
- S.D.E Electrical Systems LtdElectricians
- Seac Electrical LtdElectricians
What happens if Mark Gallagher Building 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 2028.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Feb 2028 to 29 Feb 2028 | £150 |
| 1 to 3 months late | 1 Mar 2028 to 30 Apr 2028 | £375 |
| 3 to 6 months late | 1 May 2028 to 31 Jul 2028 | £750 |
| More than 6 months late | From 1 Aug 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 May 2028 | £200 |
| 3 months late | 30 Jul 2028 | another £200 |
| 6 months late | 30 Oct 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 30 Apr 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
- NI678459
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 14 April 2021 (5 years ago)
- Registered office
- 16 Upper Square, Castlewellan, BT31 9DD
- Nature of business
- Construction of domestic buildings (SIC 41202)
- Year end
- 30 April (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 30 April 2026
- Last confirmation statement
- 13 April 2026
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 Castlewellan
Other active building contractors registered in Castlewellan.
- MJD Building Ltd2018
- O'Connor Bros Homes Limited2012
- O'Reilly Bricklaying Ltd2025
- P and M Bricklaying Ltd2024
- Quoile Construction Ltd2012
- Roc Building Services Limited2007
- S D Owens Builders Ltd2015
- Savage Construction & Contracts Ltd2026
All building contractors in Castlewellan · All trades in Castlewellan · Builders across the UK
Frequently asked questions
When are Mark Gallagher Building Ltd's accounts due?
Mark Gallagher Building Ltd's next accounts are due at Companies House by 31 January 2028 (in 475 days), covering the period to 30 April 2027.
When is Mark Gallagher Building Ltd's CT600 due?
The CT600 for the period to 30 April 2027 is due at HMRC by 30 April 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 February 2028.
Is Mark Gallagher Building Ltd still trading?
Mark Gallagher Building 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 Mark Gallagher Building Ltd do?
Mark Gallagher Building Ltd is registered under Construction of domestic buildings (SIC 41202).
How old is Mark Gallagher Building Ltd?
Mark Gallagher Building Ltd was incorporated on 14 April 2021, 5 years ago.
What is the penalty if Mark Gallagher Building 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 Mark Gallagher Building 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.