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- Sei Northwest Ltd
Company profile · Electricians
Sei Northwest Ltd
Sei Northwest Ltd is a 1-year-old private limited company registered in Blackpool, company number 16085229, one of 149 electrical contractors in Blackpool. Its next accounts are due at Companies House on 31 December 2027, and the CT600 for the period to 31 March 2027 is due at HMRC on 31 March 2028.
Key dates
Worked out from the year end and filing history on the Companies House register.
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Financial snapshot, 2026
From the balance sheet at 31 March 2026, as filed at Companies House. Negative net assets mean the company owed more than it owned at that date.
Sei Northwest 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 down £16K (-97.2%) on the year before, to -£32K.
- Current assets of £3,559 against £56K owed within a year: 0.1 times cover.
- 3 employees on average, up from 2 the year before.
- Balance sheets on record for 2 years, 2025 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2026 | -£32K | £3,559 | £56K | 3 | |
| 31 Mar 2025 | -£16K | £3,609 | £51K | 2 |
Where Sei Northwest Ltd is registered
The registered office is in Blackpool (FY3), in the Blackpool local authority area, North West. Show FY3 9DP on a map.
Other trade companies in FY3
- SJW Electrical NW LtdElectricians
- Building Serviced Visions LtdBuilders
- Northvanta LtdBuilders
- Primo Resin LtdSpecialist contractors
- Jackson Homes Property Group LtdProperty developers
- Westgate Motorhomes and Caravans LtdMotor traders
- E.P.G 65 LimitedProperty developers
- CPB Joinery NW LtdJoiners and carpenters
What happens if Sei Northwest 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 2027.
| Companies House | Accounts delivered | Penalty |
|---|---|---|
| Up to 1 month late | 1 Jan 2028 to 31 Jan 2028 | £150 |
| 1 to 3 months late | 1 Feb 2028 to 31 Mar 2028 | £375 |
| 3 to 6 months late | 1 Apr 2028 to 30 Jun 2028 | £750 |
| More than 6 months late | From 1 Jul 2028 | £1,500 |
Penalties double if the accounts were also late the year before.
| HMRC (CT600) | From | Penalty |
|---|---|---|
| 1 day late | 1 Apr 2028 | £200 |
| 3 months late | 30 Jun 2028 | another £200 |
| 6 months late | 30 Sep 2028 | HMRC estimates the tax and adds 10% of the unpaid tax |
| 12 months late | 31 Mar 2029 | 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
- 16085229
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 18 November 2024 (1 year ago)
- Registered office
- 26 Newcastle Avenue, Blackpool, Lancashire, FY3 9DP
- Nature of business
- Electrical installation (SIC 43210)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 March 2026
- Last confirmation statement
- 17 November 2025
Filing notes for electrical contractors
Electrical contracting companies are often a director plus a van and tools. Most fall within the micro-entity rules, so the accounts filed at Companies House are short, and the CT600 carries the tax detail.
Similar companies in Blackpool
Other active electrical contractors registered in Blackpool.
- Sheffield Electrical Access Limited2007
- Short Circuit Electrical NW Ltd2024
- SJW Electrical NW Ltd2026
- Skyline Industry Services Ltd2025
- Specialist Sparks Installation and Consultancy Ltd2025
- ST8 Electrical Ltd2023
- Stelfox Electrical Solutions Ltd2025
- Technical and Electrical Services Limited1988
All electrical contractors in Blackpool · All trades in Blackpool · Electricians across the UK
Frequently asked questions
When are Sei Northwest Ltd's accounts due?
Sei Northwest Ltd's next accounts are due at Companies House by 31 December 2027 (in 445 days), covering the period to 31 March 2027.
When is Sei Northwest Ltd's CT600 due?
The CT600 for the period to 31 March 2027 is due at HMRC by 31 March 2028, 12 months after the period end. The corporation tax itself is payable earlier, by 1 January 2028.
Is Sei Northwest Ltd still trading?
Sei Northwest 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 Sei Northwest Ltd do?
Sei Northwest Ltd is registered under Electrical installation (SIC 43210).
How old is Sei Northwest Ltd?
Sei Northwest Ltd was incorporated on 18 November 2024, 1 year ago.
What is the penalty if Sei Northwest 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 Sei Northwest 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.