- Companies
- Civil engineering
- Cambridge
- S & P Mainlayers Limited
S & P Mainlayers Limited
- Company number
- 11922254
- Incorporated
- 3 Apr 20197 years trading
- Registered office
- Tennyson House Cambridge Business Park, Cowley Road, Cambridge, CB4 0WZ
- Nature of business
- Construction of other civil engineering projects n.e.c.
S & P Mainlayers Limited is a 7-year-old private limited company registered in Cambridge, company number 11922254, one of 52 civil engineering contractors in Cambridge. Its next accounts are due at Companies House on 29 June 2027, and the CT600 for the period to 29 September 2026 is due at HMRC on 29 September 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 up £26K (+6.3%) on the year before, to £438K.
- Net assets rose in 5 of 5 year-on-year comparisons on record.
- Current assets of £514K against £96K owed within a year: 5.3 times cover.
- 2 employees on average during the year.
- Balance sheets on record for 6 years, 2020 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 30 Sep 2025 | £438K | £72K | £514K | £96K | 2 |
| 30 Sep 2024 | £412K | £86K | £495K | £109K | 2 |
| 30 Sep 2023 | £318K | £13K | £418K | £111K | 2 |
| 30 Sep 2022 | £224K | £11K | £296K | £89K | 2 |
| 30 Sep 2021 | £117K | £34K | £124K | £37K | 2 |
| 30 Sep 2020 | £52K | £23K | £125K | £108K | 2 |
Who runs and owns S & P Mainlayers Limited
From the Companies House register. Individuals are shown by initials only; the full register is on Companies House.
Officers (2)
| Name | Role | Appointed |
|---|---|---|
| P*** G*** | Director | Apr 2019 |
| S*** G*** | Director | Apr 2019 |
People with significant control (2)
Where S & P Mainlayers Limited is registered
The registered office is in Cambridge (CB4), in the Cambridge local authority area, East of England. Show CB4 0WZ on a map.
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- Sorted Handyman Services LtdBuilders
- GG Property Maintenance LtdSpecialist contractors
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Also registered at this address
8 other companies use the same registered office as S & P Mainlayers Limited.
- Amberframe LimitedProperty developers
- Debondt LimitedSpecialist contractors
- Extrabuild LimitedCivil engineering
- Jer Construction LimitedBuilders
- NNC LtdBuilders
- Park Revolution Leisure LtdProperty developers
- Richard Hough (Building) LimitedFinishing trades
- The Jolly Minster Development Company LimitedProperty developers
What happens if S & P Mainlayers 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 29 June 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 30 Jun 2027 to 29 Jul 2027 | £150 |
| 1 to 3 months late | 30 Jul 2027 to 29 Sep 2027 | £375 |
| 3 to 6 months late | 30 Sep 2027 to 29 Dec 2027 | £750 |
| More than 6 months late | From 30 Dec 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 30 Sep 2027 | £200 |
| 3 months late | 29 Dec 2027 | another £200 |
| 6 months late | 29 Mar 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 29 Sep 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
- 11922254
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 3 April 2019 (7 years ago)
- Registered office
- Tennyson House Cambridge Business Park, Cowley Road, Cambridge, CB4 0WZ
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
- Year end
- 29 September (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 30 September 2025
- Last confirmation statement
- 2 April 2026
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 Cambridge
Other active civil engineering contractors registered in Cambridge.
- S Cradock TM Limited2024
- Simology Limited2024
- Site Support Services Limited2021
- Solidcare Infratech Ltd2023
- SPL Utilities Ltd2014
- Spooks Specialist Paving & Groundworks Ltd2014
- T J Garrett Ltd2015
- T Leneghan Construction Services Limited2016
All civil engineering contractors in Cambridge · All trades in Cambridge · Civil engineering across the UK
Frequently asked questions
When are S & P Mainlayers Limited's accounts due?
S & P Mainlayers Limited's next accounts are due at Companies House by 29 June 2027 (in 259 days), covering the period to 29 September 2026.
When is S & P Mainlayers Limited's CT600 due?
The CT600 for the period to 29 September 2026 is due at HMRC by 29 September 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 30 June 2027.
Is S & P Mainlayers Limited still trading?
S & P Mainlayers 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 S & P Mainlayers Limited do?
S & P Mainlayers Limited is registered under Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is S & P Mainlayers Limited?
S & P Mainlayers Limited was incorporated on 3 April 2019, 7 years ago.
Who runs S & P Mainlayers Limited?
S & P Mainlayers Limited has 2 active directors, the longest-serving appointed in Apr 2019. Their names and service addresses are on the Companies House register.
Who owns S & P Mainlayers Limited?
2 people or companies have significant control of S & P Mainlayers Limited: an individual (owns 25% to 50% of the shares); an individual (owns 25% to 50% of the shares).
What is the penalty if S & P Mainlayers 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 S & P Mainlayers 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.