- Companies
- Specialist contractors
- Orpington
- DSP Drainage & Plumbing Limited
DSP Drainage & Plumbing Limited
- Company number
- 09439650
- Incorporated
- 13 Feb 201511 years trading
- Registered office
- 2ND Floor (Right) Downe House, 303 High Street, Orpington, Kent, BR6 0NN
- Nature of business
- Other specialised construction activities n.e.c.
DSP Drainage & Plumbing Limited is a 11-year-old private limited company registered in Orpington, company number 09439650, one of 95 specialist construction companies in Orpington. 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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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 £38K (+12%) on the year before, to £353K.
- Net assets rose in 5 of 9 year-on-year comparisons on record.
- Current assets of £400K against £238K owed within a year: 1.7 times cover.
- No employees reported for the latest year (directors are often not counted as employees).
- 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 | £353K | £261K | £400K | £238K | 0 |
| 31 Mar 2025 | £315K | £202K | £345K | £238K | 20 |
| 31 Mar 2024 | £523K | £337K | £550K | £266K | 18 |
| 31 Mar 2023 | £445K | £223K | £344K | £132K | 15 |
| 31 Mar 2022 | £468K | £186K | £334K | £131K | 19 |
| 31 Mar 2021 | £412K | £83K | £342K | £141K | 22 |
| 31 Mar 2020 | £412K | £82K | £334K | £172K | |
| 31 Mar 2019 | £349K | £106K | £244K | £75K | |
| 31 Mar 2018 | £355K | £40K | £305K | £112K | |
| 31 Mar 2017 | £175K | £76K | £206K | £98K |
Public contracts won
DSP Drainage & Plumbing Limited has 2 public sector contract awards on record; the ones with their own published value total £25K, from 2024 to 2025. Source: Contracts Finder and Find a Tender award notices. For 1 of them the published figure is a shared or multi-year ceiling (a framework place, a multi-supplier award, or more than a small company could hold alone), so no value is shown. 1 of these were matched by the company's exact name because the notice gave no company number.
Awards by year
Main buyers
- Maidstone and Tunbridge Wells NHS Trust1 award
- Dover District Council1 award
| Buyer | Contract | Value | Awarded |
|---|---|---|---|
| Maidstone and Tunbridge Wells NHS Trust | Drainage Services 2 | Ceiling, not shown | 30 Sep 2025 |
| Dover District Council | Drainage Repairs at 1-24 Pencester Court, Stembrook, Dover | £25K | 31 Jul 2024 |
Where DSP Drainage & Plumbing Limited is registered
The registered office is in Orpington (BR6), in the Bromley local authority area, London. Show BR6 0NN on a map.
Other trade companies in BR6
- Tog Fire Protection LtdPlumbers and heating engineers
- Pointfast Global LtdMachinery repair and installation
- Chebic Energy and Property Services LtdFinishing trades
- Prime Refurbishment Kent LtdBuilders
- A.D Building Services London LtdFinishing trades
- Nemo Wash and Go LtdCleaning companies
- T.E.A.Mspotless LtdCleaning companies
- Howard Construction LtdProperty developers
Also registered at this address
3 other companies use the same registered office as DSP Drainage & Plumbing Limited.
- D A Gibbons Builders LtdFinishing trades
- Pinewood Electrical Controls LimitedMachinery repair and installation
- Tarven Electrical Contractors LimitedElectricians
What happens if DSP Drainage & Plumbing 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
- 09439650
- Status
- Active
- Company type
- Private limited company
- Incorporated
- 13 February 2015 (11 years ago)
- Registered office
- 2ND Floor (Right) Downe House, 303 High Street, Orpington, Kent, BR6 0NN
- Nature of business
- Other specialised construction activities n.e.c. (SIC 43999)
- Year end
- 31 March (accounting reference date)
- Accounts type
- Total exemption (full)
- Last accounts made up to
- 31 March 2026
- Last confirmation statement
- 13 February 2026
- Previous names
- BML Drainage Limited (until 28 Sep 2018)
Filing notes for specialist construction companies
Specialist contractors often work under CIS for main contractors. Retentions held back by the customer still count towards turnover once the work is done.
Similar companies in Orpington
Other active specialist construction companies registered in Orpington.
- DTB Surveying Ltd2026
- Elite Duct Extractions Limited2026
- Elki Consulting Limited2025
- Gofix Carpentry Ltd2013
- Good With Woods Carpentry Ltd2020
- Grasmere Paving and Landscaping Limited2020
- Greenbridge Eco Group Ltd2026
- Gtim Design Ltd2015
All specialist construction companies in Orpington · All trades in Orpington · Specialist contractors across the UK
Frequently asked questions
When are DSP Drainage & Plumbing Limited's accounts due?
DSP Drainage & Plumbing 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 DSP Drainage & Plumbing 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 DSP Drainage & Plumbing Limited still trading?
DSP Drainage & Plumbing 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 DSP Drainage & Plumbing Limited do?
DSP Drainage & Plumbing Limited is registered under Other specialised construction activities n.e.c. (SIC 43999).
How old is DSP Drainage & Plumbing Limited?
DSP Drainage & Plumbing Limited was incorporated on 13 February 2015, 11 years ago.
Has DSP Drainage & Plumbing Limited won public sector contracts?
Yes. DSP Drainage & Plumbing Limited has 2 contract awards from public bodies on Contracts Finder and Find a Tender (those with their own published value total £25K), most recently from Maidstone and Tunbridge Wells NHS Trust.
What is the penalty if DSP Drainage & Plumbing 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 DSP Drainage & Plumbing 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.