- Companies
- Installers
- Darlington
- Rennyco Limited
Rennyco Limited
- Company number
- 01975691
- Incorporated
- 8 Jan 198640 years trading
- Registered office
- Westree Buildings, Whessoe Road, Darlington, County Durham, DL3 0XE
- Nature of business
- Other construction installation; Other specialised construction activities n.e.c.
Rennyco Limited is a 40-year-old private limited company registered in Darlington, company number 01975691, one of 41 installation companies (insulation, lifts, shutters and similar) in Darlington. 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.
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 Rennyco 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 up £151K (+29%) on the year before, to £673K.
- Net assets rose in 5 of 9 year-on-year comparisons on record.
- Current assets of £1.1M against £573K owed within a year: 2.0 times cover.
- 11 employees on average during the year.
- Balance sheets on record for 10 years, 2017 to 2026.
Net assets by year
| Year end | Net assets | Cash | Current assets | Owed within a year | Employees |
|---|---|---|---|---|---|
| 31 Mar 2026 | £673K | £688K | £1.1M | £573K | 11 |
| 31 Mar 2025 | £522K | £458K | £787K | £352K | 11 |
| 31 Mar 2024 | £376K | £293K | £816K | £378K | 9 |
| 31 Mar 2023 | £374K | £425K | £904K | £457K | 13 |
| 31 Mar 2022 | £281K | £303K | £911K | £528K | 12 |
| 31 Mar 2021 | £273K | £353K | £745K | £354K | 13 |
| 31 Mar 2020 | £428K | £78K | £830K | £298K | 12 |
| 31 Mar 2019 | £431K | £166K | £876K | £284K | 11 |
| 31 Mar 2018 | £470K | £115K | £720K | £350K | 11 |
| 31 Mar 2017 | £603K | £78K | £385K | £151K | 15 |
Public contracts won
Rennyco Limited has 4 public sector contract awards on record; the ones with their own published value total £147K, from 2018 to 2025. Source: Contracts Finder and Find a Tender award notices. 3 of these were matched by the company's exact name because the notice gave no company number.
Awards by year
Main buyers
- Darlington Borough Council4 awards
| Buyer | Contract | Value | Awarded |
|---|---|---|---|
| Darlington Borough Council | Eastbourne Sports Complex Grass Pitch Playing Field Fencing Works | £17K | 25 Jun 2025 |
| Darlington Borough Council | P2018/1607/EG & PB2023-01341 - Remove Boundary Fence from Springfield former school site | £47K | 24 Mar 2023 |
| Darlington Borough Council | Lot 10 - Metal Fencing | £48K | 31 Mar 2021 |
| Darlington Borough Council | P2017/1433/Ne - Allington Way North - New Build Housing | £34K | 25 Jun 2018 |
Where Rennyco Limited is registered
The registered office is in Darlington (DL3), in the Darlington local authority area, North East. Show DL3 0XE on a map.
Other trade companies in DL3
- Shine With Helen LtdCleaning companies
- RJB Consultants LtdInstallers
- Garry's Car Valeting LtdCleaning companies
- Go Elite Cleaning Services LtdCleaning companies
- BGP Property LtdProperty developers
- Frontier Energy Services LtdPlumbers and heating engineers
- Andrew Morgan Joinery LtdJoiners and carpenters
- Aburns Engineering LtdBuilders
Also registered at this address
1 other company uses the same registered office as Rennyco Limited.
- MRC Roads LimitedCivil engineering
What happens if Rennyco 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 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
- 01975691
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 8 January 1986 (40 years ago)
- Registered office
- Westree Buildings, Whessoe Road, Darlington, County Durham, DL3 0XE
- Nature of business
- Other construction installation (SIC 43290)
Other specialised construction activities n.e.c. (SIC 43999) - Year end
- 31 March (accounting reference date)
- Accounts type
- Unaudited abridged
- Last accounts made up to
- 31 March 2026
- Last confirmation statement
- 24 April 2026
- Charges (mortgages)
- 0 outstanding of 4 registered
Filing notes for installation companies (insulation, lifts, shutters and similar)
Installation companies (insulation, lifts, shutters, solar and similar) often buy stock and equipment up front, so stock at the year end and capital allowances both affect the tax bill.
Similar companies in Darlington
Other active installation companies (insulation, lifts, shutters and similar) registered in Darlington.
- RJB Consultants Ltd2026
- Stephen Oliver Living Ltd2025
- Storefit (UK) Limited2015
- Survey and Installation Limited2023
- Taymer Boilers and Bathrooms Ltd2024
- The Luxury Wood Floor Company Ltd2025
- Trade Valley Vae Ltd2022
- TT Kitchen Installations Limited2016
All installation companies (insulation, lifts, shutters and similar) in Darlington · All trades in Darlington · Installers across the UK
Frequently asked questions
When are Rennyco Limited's accounts due?
Rennyco Limited's next accounts are due at Companies House by 31 December 2027 (in 444 days), covering the period to 31 March 2027.
When is Rennyco Limited'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 Rennyco Limited still trading?
Rennyco 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 Rennyco Limited do?
Rennyco Limited is registered under Other construction installation (SIC 43290); Other specialised construction activities n.e.c. (SIC 43999).
How old is Rennyco Limited?
Rennyco Limited was incorporated on 8 January 1986, 40 years ago.
Has Rennyco Limited won public sector contracts?
Yes. Rennyco Limited has 4 contract awards from public bodies on Contracts Finder and Find a Tender (those with their own published value total £147K), most recently from Darlington Borough Council.
What is the penalty if Rennyco 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 Rennyco 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.