- Companies
- Civil engineering
- Portsmouth
- T Coleborn and Son Limited
T Coleborn and Son Limited
- Company number
- 03608296
- Incorporated
- 31 Jul 199828 years trading
- Registered office
- Unit 3.2, Central Point, Kirpal Road, Portsmouth, Hampshire, PO3 6FH
- Nature of business
- Construction of other civil engineering projects n.e.c.; Other construction installation
T Coleborn and Son Limited is a 28-year-old private limited company registered in Portsmouth, company number 03608296, one of 74 civil engineering contractors in Portsmouth. Its next accounts are due at Companies House on 30 September 2027, and the CT600 for the period to 31 December 2026 is due at HMRC on 31 December 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 £275K (+12.6%) on the year before, to £2.5M.
- Net assets rose in 8 of 9 year-on-year comparisons on record.
- Current assets of £2.7M against £450K owed within a year: 6.0 times cover.
- 25 employees on average, up from 23 the year before.
- 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 Dec 2025 | £2.5M | £2.2M | £2.7M | £450K | 25 |
| 31 Dec 2024 | £2.2M | £2.1M | £2.4M | £441K | 23 |
| 31 Dec 2023 | £1.6M | £1.6M | £1.9M | £482K | 23 |
| 31 Dec 2022 | £2.2M | £2M | £2.3M | £305K | 23 |
| 31 Dec 2021 | £2M | £1.9M | £2M | £235K | 23 |
| 31 Dec 2020 | £1.8M | £1.9M | £1.9M | £327K | 22 |
| 31 Dec 2019 | £1.6M | £1.5M | £1.8M | £404K | 18 |
| 31 Dec 2018 | £1.2M | £1.2M | £1.3M | £331K | 18 |
| 31 Dec 2017 | £865K | £712K | £946K | £302K | 16 |
| 31 Dec 2016 | £774K | £643K | £711K | £165K | 16 |
Public contracts won
T Coleborn and Son Limited has 80 public sector contract awards on record; the ones with their own published value total £4.4M, from 2017 to 2026. Source: Contracts Finder and Find a Tender award notices. For 2 of them the published figure is a shared or multi-year ceiling (a framework place, a multi-supplier award, or more than a small company could hold alone), so no value is shown. 69 of these were matched by the company's exact name because the notice gave no company number.
Awards by year
Main buyers
- Hampshire County Council73 awards
- Historic England3 awards
- Portsmouth City Council1 award
- Royal Armouries Museum1 award
- Historic England Limited1 award
| Buyer | Contract | Value | Awarded |
|---|---|---|---|
| Hampshire County Council | Cornerstone CE (A) Primary School - Post Completion Rectification Works | £172K | 10 Jul 2026 |
| Hampshire County Council | St John The Baptist CE (C) Primary School (Titchfield) - Fascia Works | £127K | 9 Jul 2026 |
| Hampshire County Council | Prospect School - Internal Alterations for Breakout Space | £128K | 1 Jul 2026 |
| Hampshire County Council | Liphook Infant School - Toilet Refurbishment | £117K | 24 Jun 2026 |
| Portsmouth City Council | Register Office Decorating | 19 Jun 2026 | |
| Hampshire County Council | St John The Baptist CE (C) Primary School (Waltham Chase) - Toilet Refurbishment | £123K | 15 Jun 2026 |
| Hampshire County Council | Ashley Infant School - Structural Repairs - Various | £12K | 11 Jun 2026 |
| Hampshire County Council | Cove School - Science Lab | £202K | 13 Apr 2026 |
| Hampshire County Council | Springwood Junior School - Fire Repair Instructions | £49K | 24 Mar 2026 |
| Hampshire County Council | MWF Lot 1 Internal Door Alteration, Key Education Centre (Gosport) - AWARD | £10K | 27 Jan 2026 |
Showing the 10 most recent of 80.
Where T Coleborn and Son Limited is registered
The registered office is in Portsmouth (PO3), in the Portsmouth local authority area, South East. Show PO3 6FH on a map.
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What happens if T Coleborn and Son 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 30 September 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Oct 2027 to 31 Oct 2027 | £150 |
| 1 to 3 months late | 1 Nov 2027 to 31 Dec 2027 | £375 |
| 3 to 6 months late | 1 Jan 2028 to 31 Mar 2028 | £750 |
| More than 6 months late | From 1 Apr 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Jan 2028 | £200 |
| 3 months late | 31 Mar 2028 | another £200 |
| 6 months late | 30 Jun 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Dec 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
- 03608296
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 31 July 1998 (28 years ago)
- Registered office
- Unit 3.2, Central Point, Kirpal Road, Portsmouth, Hampshire, PO3 6FH
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
Other construction installation (SIC 43290) - Year end
- 31 December (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 December 2025
- Last confirmation statement
- 14 November 2025
- Charges (mortgages)
- 0 outstanding of 2 registered
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 Portsmouth
Other active civil engineering contractors registered in Portsmouth.
- T.Couzens & Sons Limited1931
- The Fairway Advisory Ltd2026
- Tota Steelfixing Ltd2018
- Utility Delta Business Services Limited2021
- Volt Base Group Ltd2023
- W G Wilson & Sons Builders Limited2007
- Wardsdiving Limited2026
- White Space Innovating Designs Ltd2025
All civil engineering contractors in Portsmouth · All trades in Portsmouth · Civil engineering across the UK
Frequently asked questions
When are T Coleborn and Son Limited's accounts due?
T Coleborn and Son Limited's next accounts are due at Companies House by 30 September 2027 (in 352 days), covering the period to 31 December 2026.
When is T Coleborn and Son Limited's CT600 due?
The CT600 for the period to 31 December 2026 is due at HMRC by 31 December 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 October 2027.
Is T Coleborn and Son Limited still trading?
T Coleborn and Son 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 T Coleborn and Son Limited do?
T Coleborn and Son Limited is registered under Construction of other civil engineering projects n.e.c. (SIC 42990); Other construction installation (SIC 43290).
How old is T Coleborn and Son Limited?
T Coleborn and Son Limited was incorporated on 31 July 1998, 28 years ago.
Has T Coleborn and Son Limited won public sector contracts?
Yes. T Coleborn and Son Limited has 80 contract awards from public bodies on Contracts Finder and Find a Tender (those with their own published value total £4.4M), most recently from Hampshire County Council.
What is the penalty if T Coleborn and Son 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 T Coleborn and Son 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.