- Companies
- Civil engineering
- Rickmansworth
- Maincore Building Services Limited
Maincore Building Services Limited
- Company number
- 04553841
- Incorporated
- 4 Oct 200224 years trading
- Registered office
- 22 Frankland Road, Croxley Green, Rickmansworth, WD3 3AU
- Nature of business
- Construction of other civil engineering projects n.e.c.
Maincore Building Services Limited is a 24-year-old private limited company registered in Rickmansworth, company number 04553841, one of 15 civil engineering contractors in Rickmansworth. Its next accounts are due at Companies House on 31 December 2026, and the CT600 for the period to 31 March 2026 is due at HMRC on 31 March 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 £86 (-0.6%) on the year before, to £15K.
- Net assets rose in 3 of 9 year-on-year comparisons on record.
- Current assets of £4,999 against £12K owed within a year: 0.4 times cover.
- 2 employees on average during the year.
- Balance sheets on record for 10 years, 2016 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £15K | £4,999 | £12K | 2 | |
| 31 Mar 2024 | £15K | £32K | £17K | 2 | |
| 31 Mar 2023 | £2,909 | £18K | £16K | 2 | |
| 31 Mar 2022 | £3,132 | £14K | £12K | 2 | |
| 31 Mar 2021 | £6,571 | £16K | £12K | 2 | |
| 31 Mar 2020 | £4,837 | £16K | £13K | 2 | |
| 31 Mar 2019 | £6,453 | £24K | £21K | ||
| 31 Mar 2018 | £9,729 | £17K | £13K | ||
| 31 Mar 2017 | £2,578 | £7,358 | £11K | ||
| 31 Mar 2016 | £4,228 | £3,225 | £11K | £12K |
Where Maincore Building Services Limited is registered
The registered office is in Rickmansworth (WD3), in the Three Rivers local authority area, East of England. Show WD3 3AU on a map.
Other trade companies in WD3
- DB Roofing Services LtdRoofers
- Ijesha Real Estate LtdProperty developers
- Aa Estate Developers LtdProperty developers
- DW17 LimitedProperty developers
- Twelve Construct LtdProperty developers
- Mill End Motor Company LtdMotor traders
- Daf Construction Services LtdBuilders
- J&V Customs LtdMechanics and garages
Also registered at this address
3 other companies use the same registered office as Maincore Building Services Limited.
- Jawset Services LtdSpecialist contractors
- JGP Set Services LimitedSpecialist contractors
- Setray LtdSpecialist contractors
What happens if Maincore Building Services 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 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2027 to 31 Jan 2027 | £150 |
| 1 to 3 months late | 1 Feb 2027 to 31 Mar 2027 | £375 |
| 3 to 6 months late | 1 Apr 2027 to 30 Jun 2027 | £750 |
| More than 6 months late | From 1 Jul 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2027 | £200 |
| 3 months late | 30 Jun 2027 | another £200 |
| 6 months late | 30 Sep 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 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
- 04553841
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 4 October 2002 (24 years ago)
- Registered office
- 22 Frankland Road, Croxley Green, Rickmansworth, WD3 3AU
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 29 September 2025
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 Rickmansworth
Other active civil engineering contractors registered in Rickmansworth.
- Mastercraft Maintenance Limited1998
- MCD Haulage and Infrastructure Ltd2026
- P J Electrical & Home Automation Ltd2017
- PR Structures Ltd2023
- STN Decor Ltd2016
- Treacy Surfacing Limited1972
- Universal Civil Engineering Solutions Limited2007
- A1 Rail Services Ltd2014
All civil engineering contractors in Rickmansworth · All trades in Rickmansworth · Civil engineering across the UK
Frequently asked questions
When are Maincore Building Services Limited's accounts due?
Maincore Building Services Limited's next accounts are due at Companies House by 31 December 2026 (in 79 days), covering the period to 31 March 2026.
When is Maincore Building Services Limited's CT600 due?
The CT600 for the period to 31 March 2026 is due at HMRC by 31 March 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2027.
Is Maincore Building Services Limited still trading?
Maincore Building Services 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 Maincore Building Services Limited do?
Maincore Building Services Limited is registered under Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is Maincore Building Services Limited?
Maincore Building Services Limited was incorporated on 4 October 2002, 24 years ago.
What is the penalty if Maincore Building Services 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 Maincore Building Services 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.