How much does Drain Line Southern Limited make?

Drain Line Southern Limited reported revenue of £22.9m and £1.2m profit in the year to 31 Mar 2025, according to its accounts filed at Companies House.

How many employees does Drain Line Southern Limited have?

Drain Line Southern Limited reported an average of 255 employees in the year to 31 Mar 2025.

Is Drain Line Southern Limited profitable?

Yes — Drain Line Southern Limited reported a profit of £1.2m in the year to 31 Mar 2025.

Company No. 04933418 · Incorporated 15 Oct 2003

Drain Line Southern Limited

Registered name: DRAIN LINE SOUTHERN LIMITED

Drain Line Southern Limited made £22.9m revenue and £1.2m profit in the year to 31 Mar 2025.

Drain Line Southern Limited’s revenue grew 35% to £22.9m in the year to 31 Mar 2025, with £1.2m profit and 255 employees. The company is classified under “water collection, treatment and supply” and is based in Brighton; we hold 3 years of its filed accounts.

Full P&L filedSection E · Water supply, sewerage and waste managementSIC 36000Water collection, treatment and supply SIC 43390Other building completion and finishing

Status: Active
Location: Brighton, South East
Age: 23 yrs · since 2003
Type: Private Limited Company

Latest accounts · year to 31 Mar 2025

Key figures

IndependentCash flow filed

Revenue

£22.9m

Growth ▲34.5%

Profit

£1.2m

Growth ▼30.1%

Profit margin

5.2%

Gross 14.1%

Employees

255

Change ▲34.9%

Profit / employee

£4.7k

Revenue/employee £89.6k

Profitable streak

3yrs

Consecutive profitable years in our data

Badges are automated estimates derived from the filed figures — not statements of fact about the company.

3 filed years

Financial history

Multi-year financials, oldest to newest
Year to	31 Mar 2023	31 Mar 2024	31 Mar 2025
Disclosure	Full P&L	Full P&L	Full P&L
Profit & loss
Revenue (turnover)	£12.3m	£17m	£22.9m
Cost of sales	£10m	£13.4m	£19.6m
Gross profit	£2.3m	£3.5m	£3.2m
Operating profit	£1.4m	£2.4m	£1.7m
Profit before tax	£1.2m	£2.3m	£1.6m
Profit after tax	£952k	£1.7m	£1.2m
Profit (best available)	£952k	£1.7m	£1.2m
Staff costs	£5.9m	£8.1m	£11.6m
Employees (average)	136	189	255
Ratios
Profit margin	7.8%	10%	5.2%
Gross margin	18.8%	20.9%	14.1%
Revenue per employee	£90.1k	£89.9k	£89.6k
Profit per employee	£7k	£9k	£4.7k
Cash conversion	−134.1%	−128.3%	−112.2%
Growth (year on year)
Revenue growth	—	▲38.6%	▲34.5%
Profit growth	—	▲78.9%	▼30.1%
Headcount growth	—	▲39%	▲34.9%
Balance sheet — indirect signals, not revenue
Cash at bank	£1m	£2.2m	£1.7m
Net assets	£1.5m	£2.2m	£2.4m
Fixed assets	£3.2m	£4.3m	£4.6m
Current assets	£3.3m	£5.3m	£5.9m
Debtors	£2m	£2.3m	£3.5m
Cash from operations	−£1.8m	−£3.1m	−£1.9m
Source	FullAccounts · bulk data Sep 2024	FullAccounts · bulk data Sep 2024	FullAccounts · bulk data Dec 2025

Derived from the latest filing

How the business works

Profit margin: 5.2%; Profit ÷ revenue.
Gross margin: 14.1%; Gross profit ÷ revenue. High for software and services.
Revenue per employee: £89.6k; Revenue ÷ average employees.
Profit per employee: £4.7k; Profit ÷ average employees.
Cash conversion: −112.2%; Cash generated from operations ÷ operating profit. Needs a cash-flow statement.
Fixed assets ÷ revenue: 20%; Capital intensity. Low = capital-light, cheaper to start.
Deferred income ÷ revenue: —; Customers paying upfront (subscriptions, deposits). Approximate when combined with accruals.
Debtors ÷ revenue: 15.2%; Money owed by customers. Low = customers pay quickly.

Indirect — not revenue

Balance-sheet signals

Year-on-year changes in filed balance-sheet items. They can hint at momentum (or investment) but are not revenue or profit and must not be read as such.

Net assets: ▲7%; Now £2.4m
Cash at bank: ▼26%; Now £1.7m
Headcount: ▲35%; Now 255
Deferred income: —; Now —
Fixed assets: ▲7%; Now £4.6m

Corporate ownership

Group structure

Subsidiaries (1)

Enviroflow Services LimitedFigures not disclosed

From the Persons with Significant Control register (corporate controllers only).

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Sources

Companies House profile Filing history & original accounts

Latest figures from FullAccounts for the year to 31 Mar 2025 (profit £1.2m), from the Companies House accounts bulk data published Dec 2025. Spotted an error? Request a correction.

Updated from Companies House on 13 Oct 2026

Contains public sector information from Companies House licensed under the Open Government Licence v3.0. Data from Companies House, © Crown copyright. View the licence.