- Company number
- 11081584
- Incorporated
- 24 Nov 20178 years trading
- Registered office
- 4 Dawson Avenue, Orpington, BR5 3AZ
- Nature of business
- Construction of commercial buildings; Construction of domestic buildings
Reactor77 Ltd is a 8-year-old private limited company registered in Orpington, company number 11081584, one of 167 building contractors in Orpington. Its next accounts are due at Companies House on 31 December 2026, and its first CT600 is due at HMRC on 31 December 2026.
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 £5,795 (+409.3%) on the year before, to £7,211.
- Net assets rose in 5 of 6 year-on-year comparisons on record.
- Current assets of £112K against £119K owed within a year: 0.9 times cover.
- 2 employees on average during the year.
- Balance sheets on record for 7 years, 2018 to 2024.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Dec 2024 | £7,211 | £112K | £119K | 2 | |
| 31 Dec 2023 | £1,416 | £68K | £69K | 2 | |
| 31 Dec 2022 | £321 | £0 | £57K | 3 | |
| 31 Dec 2021 | £32K | £3,202 | £102K | 0 | |
| 31 Dec 2020 | £25K | £10K | £38K | 4 | |
| 30 Nov 2019 | £428 | £89K | 4 | ||
| 30 Nov 2018 | -£4,825 | £1,159 | £5,984 |
Where Reactor77 Ltd is registered
The registered office is in Orpington (BR5), in the Bromley local authority area, London. Show BR5 3AZ on a map.
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- Hawk Landscapes LtdLandscapers and gardeners
- Rankins Roofing LtdRoofers
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What happens if Reactor77 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
- 11081584
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 24 November 2017 (8 years ago)
- Registered office
- 4 Dawson Avenue, Orpington, BR5 3AZ
- Nature of business
- Construction of commercial buildings (SIC 41201)
Construction of domestic buildings (SIC 41202) - Year end
- 31 December (accounting reference date)
- Accounts type
- Micro-entity
- Last accounts made up to
- 31 December 2024
- Last confirmation statement
- 23 November 2025
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 Orpington
Other active building contractors registered in Orpington.
- Redline Brickwork Midlands Limited2016
- Rhoomes & Extensions Ltd2018
- Rock Mason Construction Trading and Contracting Limited2025
- Rosenau Ltd2025
- RPM (South East) Limited2014
- RSS Site Services Limited2026
- S & M Property Development Limited2017
- S P Building Projects Ltd2018
All building contractors in Orpington · All trades in Orpington · Builders across the UK
Frequently asked questions
When are Reactor77 Ltd's accounts due?
Reactor77 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 Reactor77 Ltd's CT600 due?
The first accounts cover more than 12 months, so there are two Company Tax Returns: one for the 12 months to 31 December 2025, due by 31 December 2026, and one for the period to 31 March 2026, due by 31 March 2027. Corporation tax is payable 9 months and 1 day after the end of each.
Is Reactor77 Ltd still trading?
Reactor77 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 Reactor77 Ltd do?
Reactor77 Ltd is registered under Construction of commercial buildings (SIC 41201); Construction of domestic buildings (SIC 41202).
How old is Reactor77 Ltd?
Reactor77 Ltd was incorporated on 24 November 2017, 8 years ago.
What is the penalty if Reactor77 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 Reactor77 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.