- Companies
- Civil engineering
- Northampton
- Keybuild Northampton Ltd
Keybuild Northampton Ltd
- Company number
- 12430525
- Incorporated
- 28 Jan 20206 years trading
- Registered office
- Artisans' House, 7 Queensbridge, Northampton, Northamptonshire, NN4 7BF
- Nature of business
- Construction of other civil engineering projects n.e.c.
Keybuild Northampton Ltd is a 6-year-old private limited company registered in Northampton, company number 12430525, one of 152 civil engineering contractors in Northampton. Its next accounts are due at Companies House on 31 October 2026, and the CT600 for the period to 31 January 2026 is due at HMRC on 31 January 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 £35 (-0.7%) on the year before, to £4,663.
- Net assets rose in 1 of 4 year-on-year comparisons on record.
- Current assets of £161K against £180K owed within a year: 0.9 times cover.
- 6 employees on average, down from 7 the year before.
- Balance sheets on record for 5 years, 2021 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Jan 2025 | £4,663 | £50K | £161K | £180K | 6 |
| 31 Jan 2024 | £4,698 | £98K | £112K | £123K | 7 |
| 31 Jan 2023 | £12K | £52K | £66K | £67K | 7 |
| 31 Jan 2022 | £54K | £66K | £83K | £45K | 7 |
| 31 Jan 2021 | £44K | £75K | £75K | £52K | 7 |
Where Keybuild Northampton Ltd is registered
The registered office is in Northampton (NN4), in the West Northamptonshire local authority area, East Midlands. Show NN4 7BF on a map.
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Shared registered office
76 companies on our pages use this registered office address. An address shared this widely is usually an accountant's office or a company formation agent's service address, not where the business trades from.
What happens if Keybuild Northampton 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 October 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Nov 2026 to 30 Nov 2026 | £150 |
| 1 to 3 months late | 1 Dec 2026 to 31 Jan 2027 | £375 |
| 3 to 6 months late | 1 Feb 2027 to 30 Apr 2027 | £750 |
| More than 6 months late | From 1 May 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Feb 2027 | £200 |
| 3 months late | 30 Apr 2027 | another £200 |
| 6 months late | 31 Jul 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Jan 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
- 12430525
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 28 January 2020 (6 years ago)
- Registered office
- Artisans' House, 7 Queensbridge, Northampton, Northamptonshire, NN4 7BF
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
- Year end
- 31 January (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 January 2025
- Last confirmation statement
- 29 July 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 Northampton
Other active civil engineering contractors registered in Northampton.
- Kodom TM Ltd2025
- Laf Utilities Ltd2025
- Lakefield Group Holdings Limited2025
- Lawrie’S Block Paving Limited2022
- LCC Rail and Civil Services Ltd2026
- Lorex Gab Limited2014
- Luna Consulting Ltd2024
- Lunu Construction Ltd2023
All civil engineering contractors in Northampton · All trades in Northampton · Civil engineering across the UK
Frequently asked questions
When are Keybuild Northampton Ltd's accounts due?
Keybuild Northampton Ltd's next accounts are due at Companies House by 31 October 2026 (in 18 days), covering the period to 31 January 2026.
When is Keybuild Northampton Ltd's CT600 due?
The CT600 for the period to 31 January 2026 is due at HMRC by 31 January 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 November 2026.
Is Keybuild Northampton Ltd still trading?
Keybuild Northampton 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 Keybuild Northampton Ltd do?
Keybuild Northampton Ltd is registered under Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is Keybuild Northampton Ltd?
Keybuild Northampton Ltd was incorporated on 28 January 2020, 6 years ago.
What is the penalty if Keybuild Northampton 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 Keybuild Northampton 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.