- Companies
- Civil engineering
- Darlington
- Proteq (Northern) Limited
Proteq (Northern) Limited
- Company number
- 03057772
- Incorporated
- 17 May 199531 years trading
- Registered office
- Proteq West Lane, Dalton on Tees, Darlington, DL2 2PP
- Nature of business
- Construction of other civil engineering projects n.e.c.
Proteq (Northern) Limited is a 31-year-old private limited company registered in Darlington, company number 03057772, one of 42 civil engineering contractors in Darlington. 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 up £230K (+44%) on the year before, to £754K.
- Net assets rose in 5 of 6 year-on-year comparisons on record.
- Current assets of £718K against £219K owed within a year: 3.3 times cover.
- 10 employees on average during the year.
- Balance sheets on record for 7 years, 2019 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 May 2025 | £754K | £188K | £718K | £219K | 10 |
| 31 May 2024 | £523K | £60K | £512K | £200K | 10 |
| 31 May 2023 | £224K | £232K | £383K | £218K | 10 |
| 31 May 2022 | £210K | £72K | £256K | £93K | 10 |
| 31 May 2021 | £192K | £173K | £257K | £131K | 18 |
| 31 May 2020 | £207K | £196K | £271K | £130K | 14 |
| 31 May 2019 | £158K | £258K | £332K | £218K | 14 |
Public contracts won
Proteq (Northern) Limited has 5 public sector contract awards on record; the ones with their own published value total £145K, from 2021 to 2023. Source: Contracts Finder and Find a Tender award notices. These were matched by the company's exact name because the notice gave no company number.
Awards by year
Main buyers
- The Queen Elizabeth Hospital King's Lynn Nhs Foundation Trust4 awards
- Telford & Wrekin Council1 award
| Buyer | Contract | Value | Awarded |
|---|---|---|---|
| The Queen Elizabeth Hospital King's Lynn Nhs Foundation Trust | Repair Chimney Stacks | £44K | 12 Oct 2023 |
| The Queen Elizabeth Hospital King's Lynn Nhs Foundation Trust | Provision of Chimney Inspection Contract | £12K | 24 Jul 2022 |
| The Queen Elizabeth Hospital King's Lynn Nhs Foundation Trust | Provision of Chimney Inspection Contract | £12K | 30 Jun 2022 |
| The Queen Elizabeth Hospital King's Lynn Nhs Foundation Trust | Inspection Contract | £12K | 31 May 2022 |
| Telford & Wrekin Council | GB-Telford: Stirchley Chimney Maintenance Works | £65K | 5 Jan 2021 |
Where Proteq (Northern) Limited is registered
The registered office is in Darlington (DL2), in the North Yorkshire local authority area, Yorkshire and The Humber. Show DL2 2PP on a map.
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What happens if Proteq (Northern) 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 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
- 03057772
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 17 May 1995 (31 years ago)
- Registered office
- Proteq West Lane, Dalton on Tees, Darlington, DL2 2PP
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
- Year end
- 31 May (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 May 2025
- Last confirmation statement
- 23 April 2026
- Charges (mortgages)
- 1 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 Darlington
Other active civil engineering contractors registered in Darlington.
- Safeguard Contracts Ltd2016
- Sarrail Limited2022
- SD Roadstone Ltd2017
- Stejobell Ltd2022
- Stonemouse Limited2015
- T. M. Ward (Darlington) Limited1992
- Thurlwell Engineering Ltd2025
- Todds Highway Maintenance Limited1996
All civil engineering contractors in Darlington · All trades in Darlington · Civil engineering across the UK
Frequently asked questions
When are Proteq (Northern) Limited's accounts due?
Proteq (Northern) Limited's next accounts are due at Companies House by 28 February 2027 (in 138 days), covering the period to 31 May 2026.
When is Proteq (Northern) Limited'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 Proteq (Northern) Limited still trading?
Proteq (Northern) 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 Proteq (Northern) Limited do?
Proteq (Northern) Limited is registered under Construction of other civil engineering projects n.e.c. (SIC 42990).
How old is Proteq (Northern) Limited?
Proteq (Northern) Limited was incorporated on 17 May 1995, 31 years ago.
Has Proteq (Northern) Limited won public sector contracts?
Yes. Proteq (Northern) Limited has 5 contract awards from public bodies on Contracts Finder and Find a Tender (those with their own published value total £145K), most recently from The Queen Elizabeth Hospital King's Lynn Nhs Foundation Trust.
What is the penalty if Proteq (Northern) 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 Proteq (Northern) 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.