- Companies
- Specialist contractors
- Harlow
- Mack Building Services Ltd
Mack Building Services Ltd
- Company number
- 10187386
- Incorporated
- 18 May 201610 years trading
- Registered office
- 48 Rushes Mead, Harlow, Essex, CM18 6QB
- Nature of business
- Other specialised construction activities n.e.c.
Mack Building Services Ltd is a 10-year-old private limited company registered in Harlow, company number 10187386, one of 116 specialist construction companies in Harlow. Its next accounts are due at Companies House on 28 February 2027, and the CT600 for the period to 31 May 2026 is due at HMRC on 31 May 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 £1,220 (-32.5%) on the year before, to £2,535.
- Net assets rose in 4 of 8 year-on-year comparisons on record.
- Current assets of £47K against £49K owed within a year: 1.0 times cover.
- 3 employees on average during the year.
- Balance sheets on record for 9 years, 2017 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 May 2025 | £2,535 | £47K | £49K | 3 | |
| 31 May 2024 | £3,755 | £64K | £67K | 3 | |
| 31 May 2023 | £18 | £33K | £43K | 2 | |
| 31 May 2022 | £4,086 | £59K | £69K | 2 | |
| 31 May 2021 | £733 | £42K | £58K | 2 | |
| 31 May 2020 | £90 | £16K | £18K | 2 | |
| 31 May 2019 | £29K | £49K | £20K | 2 | |
| 31 May 2018 | £11K | £23K | £14K | 2 | |
| 31 May 2017 | £45K | £69K | £24K | 2 |
Where Mack Building Services Ltd is registered
The registered office is in Harlow (CM18), in the Harlow local authority area, East of England. Show CM18 6QB on a map.
Other trade companies in CM18
- Ejc Lofts LtdBuilders
- The Kinsmann Group LimitedFacilities management
- E.F Maintenance LtdElectricians
- Fellas Construction LtdBuilders
- 5Wheels Recovery LtdMechanics and garages
- Troy Select Motors LtdMotor traders
- Attwell Roofing and Construction LtdRoofers
- All About Roofing and Building LtdRoofers
Also registered at this address
1 other company uses the same registered office as Mack Building Services Ltd.
- Clnruk LtdCleaning companies
What happens if Mack Building 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 28 February 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Mar 2027 to 31 Mar 2027 | £150 |
| 1 to 3 months late | 1 Apr 2027 to 31 May 2027 | £375 |
| 3 to 6 months late | 1 Jun 2027 to 31 Aug 2027 | £750 |
| More than 6 months late | From 1 Sep 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jun 2027 | £200 |
| 3 months late | 31 Aug 2027 | another £200 |
| 6 months late | 30 Nov 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 May 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
- 10187386
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 18 May 2016 (10 years ago)
- Registered office
- 48 Rushes Mead, Harlow, Essex, CM18 6QB
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 31 May (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 May 2025
- Last confirmation statement
- 16 March 2026
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 Harlow
Other active specialist construction companies registered in Harlow.
- Mara Tim Ltd2015
- Martin Iliev Ltd2017
- MB Membranes Limited2015
- Mena London Ltd2026
- Metwin Limited1958
- Mihaloiu Slip Form Ltd2015
- MJS Paving Limited2009
- MK Drywall Ltd2019
All specialist construction companies in Harlow · All trades in Harlow · Specialist contractors across the UK
Frequently asked questions
When are Mack Building Services Ltd's accounts due?
Mack Building Services Ltd's next accounts are due at Companies House by 28 February 2027 (in 139 days), covering the period to 31 May 2026.
When is Mack Building Services Ltd's CT600 due?
The CT600 for the period to 31 May 2026 is due at HMRC by 31 May 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 March 2027.
Is Mack Building Services Ltd still trading?
Mack Building 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 Mack Building Services Ltd do?
Mack Building Services Ltd is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is Mack Building Services Ltd?
Mack Building Services Ltd was incorporated on 18 May 2016, 10 years ago.
What is the penalty if Mack Building 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 Mack Building 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.