- Companies
- Property developers
- Welwyn Garden City
- Zelltec Construction Services Limited
Zelltec Construction Services Limited
- Company number
- 05355029
- Incorporated
- 7 Feb 200521 years trading
- Registered office
- Unit 3, Polaris Centre, 41 Brownfields, Welwyn Garden City, Hertfordshire, AL7 1AN
- Nature of business
- Development of building projects; Construction of commercial buildings; Construction of domestic buildings
Zelltec Construction Services Limited is a 21-year-old private limited company registered in Welwyn Garden City, company number 05355029, one of 43 property development companies in Welwyn Garden City. 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 £194K (+4.2%) on the year before, to £4.8M.
- Net assets rose in 9 of 9 year-on-year comparisons on record.
- Current assets of £6.3M against £2.8M owed within a year: 2.2 times cover.
- 7 employees on average, up from 6 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 May 2025 | £4.8M | £124K | £6.3M | £2.8M | 7 |
| 31 May 2024 | £4.6M | £822K | £6.3M | £3.1M | 6 |
| 31 May 2023 | £4.1M | £264K | £5.2M | £2.4M | 7 |
| 31 May 2022 | £3.8M | £299K | £5.5M | £3.2M | 8 |
| 31 May 2021 | £2.3M | £775K | £4.1M | £2M | 8 |
| 29 Feb 2020 | £2.2M | £496K | £3.5M | £1.5M | 8 |
| 28 Feb 2019 | £1.8M | £419K | £3.1M | £1.5M | 8 |
| 28 Feb 2018 | £1.4M | £359K | £3.1M | £1.8M | 8 |
| 28 Feb 2017 | £1.2M | £188K | £2.6M | £1.6M | 6 |
| 29 Feb 2016 | £895K | £473K | £2.1M | £1.3M |
Where Zelltec Construction Services Limited is registered
The registered office is in Welwyn Garden City (AL7), in the Welwyn Hatfield local authority area, East of England. Show AL7 1AN on a map.
Other trade companies in AL7
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- 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
Also registered at this address
1 other company uses the same registered office as Zelltec Construction Services Limited.
- Zelltec Projects LimitedProperty developers
What happens if Zelltec Construction Services 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
- 05355029
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 7 February 2005 (21 years ago)
- Registered office
- Unit 3, Polaris Centre, 41 Brownfields, Welwyn Garden City, Hertfordshire, AL7 1AN
- Nature of business
- Development of building projects (SIC 41100)
Construction of commercial buildings (SIC 41201)
Construction of domestic buildings (SIC 41202) - Year end
- 31 May (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 May 2025
- Last confirmation statement
- 7 February 2026
- Charges (mortgages)
- 4 outstanding of 6 registered
Filing notes for property development companies
Many property development companies are single-project vehicles. Stock of land and buildings sits on the balance sheet as work in progress until sale, and a company that has finished its project may become dormant rather than close.
Similar companies in Welwyn Garden City
Other active property development companies registered in Welwyn Garden City.
- Zelltec Projects Limited2007
- 1ST Well Limited2025
- Billgo Ltd2014
- Biscoff Property Limited2021
- BL Groundworks Ltd2021
- BL the Future Ltd2023
- Bolinton Limited2020
- Bray (Welwyn) Limited2021
All property development companies in Welwyn Garden City · All trades in Welwyn Garden City · Property developers across the UK
Frequently asked questions
When are Zelltec Construction Services Limited's accounts due?
Zelltec Construction Services Limited's next accounts are due at Companies House by 28 February 2027 (in 139 days), covering the period to 31 May 2026.
When is Zelltec Construction Services 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 Zelltec Construction Services Limited still trading?
Zelltec Construction Services 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 Zelltec Construction Services Limited do?
Zelltec Construction Services Limited is registered under Development of building projects (SIC 41100); Construction of commercial buildings (SIC 41201); Construction of domestic buildings (SIC 41202).
How old is Zelltec Construction Services Limited?
Zelltec Construction Services Limited was incorporated on 7 February 2005, 21 years ago.
What is the penalty if Zelltec Construction Services 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 Zelltec Construction Services 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.