- Company number
- 12458449
- Incorporated
- 12 Feb 20206 years trading
- Registered office
- 112 Wood End Gardens, Northolt, Middlesex, UB5 4QN
- Nature of business
- Construction of commercial buildings; Construction of domestic buildings
Cos Building Limited is a 6-year-old private limited company registered in Northolt, company number 12458449, one of 172 building contractors in Northolt. Its next accounts are due at Companies House on 30 November 2026, and the CT600 for the period to 28 February 2026 is due at HMRC on 28 February 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 Cos Building 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.
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 £17K (-55.8%) on the year before, to £13K.
- Net assets rose in 2 of 4 year-on-year comparisons on record.
- Current assets of £28K against £11K owed within a year: 2.5 times cover.
- 3 employees on average, down from 4 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 |
|---|---|---|---|---|---|
| 28 Feb 2025 | £13K | £28K | £11K | 3 | |
| 29 Feb 2024 | £30K | £66K | £23K | 4 | |
| 28 Feb 2023 | £13K | £86K | £52K | 3 | |
| 28 Feb 2022 | £55K | £3,644 | £31K | 1 | |
| 28 Feb 2021 | £21K | £24K | 0 |
Where Cos Building Limited is registered
The registered office is in Northolt (UB5), in the Ealing local authority area, London. Show UB5 4QN on a map.
Other trade companies in UB5
- Byvolt Electrical Services LtdElectricians
- Harmony Buildworks LtdSpecialist contractors
- RBS Homes LtdFinishing trades
- Tda Construction LimitedBuilders
- Ivaan Roofing Solutions LtdRoofers
- Jacob Fleet Services LtdMotor traders
- Upliftcarsltd LtdMotor traders
- Caraze LtdMotor traders
What happens if Cos Building 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 November 2026.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Dec 2026 to 31 Dec 2026 | £150 |
| 1 to 3 months late | 1 Jan 2027 to 28 Feb 2027 | £375 |
| 3 to 6 months late | 1 Mar 2027 to 31 May 2027 | £750 |
| More than 6 months late | From 1 Jun 2027 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Mar 2027 | £200 |
| 3 months late | 28 May 2027 | another £200 |
| 6 months late | 28 Aug 2027 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 28 Feb 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
- 12458449
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 12 February 2020 (6 years ago)
- Registered office
- 112 Wood End Gardens, Northolt, Middlesex, UB5 4QN
- Nature of business
- Construction of commercial buildings (SIC 41201)
Construction of domestic buildings (SIC 41202) - Year end
- 29 February (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 28 February 2025
- Last confirmation statement
- 11 February 2026
Filing notes for building contractors
Building companies often run the Construction Industry Scheme as a contractor, a subcontractor or both. CIS deductions suffered during the year are set against the PAYE bill, and any unrecovered balance at the year end matters when the accounts are drawn up.
Similar companies in Northolt
Other active building contractors registered in Northolt.
- Curelariu Construction Limited2017
- Da Builders Ltd2023
- Dalal Roofing and Building Ltd2026
- Dan Building Projects Ltd2026
- Danhub Ltd2017
- Danlea Construction Ltd2021
- Dardani Ltd2026
- Darvanvic Ltd2024
All building contractors in Northolt · All trades in Northolt · Builders across the UK
Frequently asked questions
When are Cos Building Limited's accounts due?
Cos Building Limited's next accounts are due at Companies House by 30 November 2026 (in 48 days), covering the period to 28 February 2026.
When is Cos Building Limited's CT600 due?
The CT600 for the period to 28 February 2026 is due at HMRC by 28 February 2027, 12 months after the period end. The corporation tax itself is payable earlier, by 1 December 2026.
Is Cos Building Limited still trading?
Cos Building 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 Cos Building Limited do?
Cos Building Limited is registered under Construction of commercial buildings (SIC 41201); Construction of domestic buildings (SIC 41202).
How old is Cos Building Limited?
Cos Building Limited was incorporated on 12 February 2020, 6 years ago.
What is the penalty if Cos Building 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 Cos Building 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.