- Companies
- Civil engineering
- Irwin Builders Limited
Company profile · Civil engineering
Irwin Builders Limited
Irwin Builders Limited is a 29-year-old private limited company, company number 03330948, one of the UK's civil engineering contractors. 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.
Is this your company?
File the accounts to Companies House and the CT600 to HMRC yourself with A.X.E.L Filing. One set of questions, both filings, £49 flat. No accountant, no subscription.
File for Irwin Builders LimitedOr get a reminder before each deadline
Free. We email you 60, 30, 14, 7 and 1 days before the accounts, CT600 and confirmation statement are due. Unsubscribe in one click.
Financial snapshot, 2025
From the balance sheet at 31 March 2025, as filed at Companies House.
Irwin Builders Limited over the years
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 £88K (+17.6%) on the year before, to £589K.
- Net assets rose in 9 of 9 year-on-year comparisons on record.
- Current assets of £870K against £281K owed within a year: 3.1 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 | £589K | £795K | £870K | £281K | 2 |
| 31 Mar 2024 | £501K | £447K | £548K | £50K | 2 |
| 31 Mar 2023 | £477K | £533K | £566K | £93K | 2 |
| 31 Mar 2022 | £452K | £566K | £597K | £146K | 2 |
| 31 Mar 2021 | £397K | £487K | £533K | £136K | 2 |
| 31 Mar 2020 | £308K | £408K | £412K | £106K | 2 |
| 31 Mar 2019 | £303K | £212K | £349K | £51K | 2 |
| 31 Mar 2018 | £298K | £260K | £379K | £84K | 2 |
| 31 Mar 2017 | £230K | £309K | £361K | £134K | 2 |
| 31 Mar 2016 | £148K | £287K | £330K | £185K |
Where Irwin Builders Limited is registered
The registered office is in the W7 postcode district, in the Ealing local authority area, London. Show W7 3QX on a map.
Other trade companies in W7
- Nasim Executive Services LtdBuilders
- Acjs Private Cleaning LtdCleaning companies
- Maya Wealth Construction LtdBuilders
- Jem Car LimitedMotor traders
- Primacy Plumbing LimitedPlumbers and heating engineers
- Segunmic Private Compay LimitedCivil engineering
- Asad Al-A'ali Automobiles&TRKS LtdMotor traders
- All Stone Studio LtdFinishing trades
What happens if Irwin Builders 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
- 03330948
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 10 March 1997 (29 years ago)
- Registered office
- 80 Studland Road, London, W7 3QX
- Nature of business
- Construction of other civil engineering projects n.e.c. (SIC 42990)
Electrical installation (SIC 43210)
Plumbing, heat and air-conditioning installation (SIC 43220)
Joinery installation (SIC 43320) - Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 6 March 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
Other active civil engineering contractors.
- McCoid Engineering Services Limited1997
- C.W. Surfacing Ltd.1997
- Lynx Engineering (Kent) Limited1997
- 4 Mation Construction Limited1997
- David Thorns (Civil Engineering) Limited1997
- Wain & Francis Limited1997
- McAlpine Projects Limited1997
- Laserco Limited1997
Civil engineering across the UK
Frequently asked questions
When are Irwin Builders Limited's accounts due?
Irwin Builders Limited's next accounts are due at Companies House by 31 December 2026 (in 80 days), covering the period to 31 March 2026.
When is Irwin Builders 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 Irwin Builders Limited still trading?
Irwin Builders 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 Irwin Builders Limited do?
Irwin Builders Limited is registered under Construction of other civil engineering projects n.e.c. (SIC 42990); Electrical installation (SIC 43210); Plumbing, heat and air-conditioning installation (SIC 43220); Joinery installation (SIC 43320).
How old is Irwin Builders Limited?
Irwin Builders Limited was incorporated on 10 March 1997, 29 years ago.
What is the penalty if Irwin Builders 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 Irwin Builders 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.