- Companies
- Builders
- Welwyn Garden City
- Complex Construction Ro Ltd
Company profile · Builders
Complex Construction Ro Ltd
Complex Construction Ro Ltd is a 10-year-old private limited company registered in Welwyn Garden City, company number 10060724, one of 53 building contractors in Welwyn Garden City. 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 Complex Construction Ro LtdOr 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.
Complex Construction Ro Ltd 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 £30K (+83.5%) on the year before, to £66K.
- Net assets rose in 4 of 7 year-on-year comparisons on record.
- Current assets of £94K against £84K owed within a year: 1.1 times cover.
- 8 employees on average during the year.
- Balance sheets on record for 8 years, 2018 to 2025.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2025 | £66K | £94K | £84K | 8 | |
| 31 Mar 2024 | £36K | £69K | £57K | 8 | |
| 31 Mar 2023 | £22K | £66K | £67K | 7 | |
| 31 Mar 2022 | £100 | £100 | |||
| 31 Mar 2021 | £100 | £100 | |||
| 31 Mar 2020 | £0 | 0 | |||
| 31 Mar 2019 | £0 | ||||
| 31 Mar 2018 | £0 |
Where Complex Construction Ro Ltd is registered
The registered office is in Welwyn Garden City (AL7), in the Welwyn Hatfield local authority area, East of England. Show AL7 1NH on a map.
Other trade companies in AL7
- Mechanicalwise LtdInstallers
- Azalea Services LimitedSpecialist contractors
- Malmech and Mannion LimitedMechanics and garages
- T&D Construction Group LtdFinishing trades
- Vertec Roofing and Building LtdRoofers
- Selectlane LtdMotor traders
- Af Pressure Washing LtdCleaning companies
- Jet Professional LtdCleaning companies
What happens if Complex Construction Ro 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 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
- 10060724
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 14 March 2016 (10 years ago)
- Registered office
- 2 Maple Grove, Welwyn Garden City, AL7 1NH
- Nature of business
- Construction of domestic buildings (SIC 41202)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2025
- Last confirmation statement
- 13 March 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 Welwyn Garden City
Other active building contractors registered in Welwyn Garden City.
- Construction Solutions Inc Ltd2023
- Dale Associates Construction Limited2007
- Data Fix Limited2024
- Dolphin Civil Engineering Ltd2014
- Driveway Pro Solutions Ltd2024
- Eco Smart Installations Limited2022
- Elmwood PM Ltd2011
- Esa Spread Development Limited2018
All building contractors in Welwyn Garden City · All trades in Welwyn Garden City · Builders across the UK
Frequently asked questions
When are Complex Construction Ro Ltd's accounts due?
Complex Construction Ro Ltd's next accounts are due at Companies House by 31 December 2026 (in 80 days), covering the period to 31 March 2026.
When is Complex Construction Ro Ltd'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 Complex Construction Ro Ltd still trading?
Complex Construction Ro 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 Complex Construction Ro Ltd do?
Complex Construction Ro Ltd is registered under Construction of domestic buildings (SIC 41202).
How old is Complex Construction Ro Ltd?
Complex Construction Ro Ltd was incorporated on 14 March 2016, 10 years ago.
What is the penalty if Complex Construction Ro 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 Complex Construction Ro 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.