How much does Tonic Construction Limited make?

Tonic Construction Limited reported revenue of £32.3m and £1.8m profit in the year to 31 Mar 2025, according to its accounts filed at Companies House.

How many employees does Tonic Construction Limited have?

Tonic Construction Limited reported an average of 102 employees in the year to 31 Mar 2025.

Is Tonic Construction Limited profitable?

Yes — Tonic Construction Limited reported a profit of £1.8m in the year to 31 Mar 2025.

Company No. 03845459 · Incorporated 21 Sep 1999

Tonic Construction Limited

Registered name: TONIC CONSTRUCTION LIMITED

Part of Tonic Trustees Limited group

Tonic Construction Limited made £32.3m revenue and £1.8m profit in the year to 31 Mar 2025.

Tonic Construction Limited’s revenue grew 19% to £32.3m in the year to 31 Mar 2025, with £1.8m profit and 102 employees. The company is classified under “construction of domestic buildings” and is based in Swindon; we hold 4 years of its filed accounts.

Full P&L filedSection F · ConstructionSIC 41202Construction of domestic buildings SIC 42110Construction of roads and motorways SIC 42990Construction of other civil engineering projects n.e.c.

Status: Active
Location: Swindon, South West
Age: 27 yrs · since 1999
Type: Private Limited Company

Part of a group. The filing indicates this company sits within a group structure, so its results may depend on intra-group trading and it may be hard to replicate independently.

Latest accounts · year to 31 Mar 2025

Key figures

Capital-lightOperating leverageCash flow filed

Revenue

£32.3m

Growth ▲18.9%

Profit

£1.8m

Growth ▲41.3%

Profit margin

5.4%

Gross 12.1%

Employees

102

Change ▲21.4%

Profit / employee

£17.2k

Revenue/employee £317k

Profitable streak

4yrs

Consecutive profitable years in our data

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

4 filed years

Financial history

Multi-year financials, oldest to newest
Year to	31 Mar 2022	31 Mar 2023	31 Mar 2024	31 Mar 2025
Disclosure	Full P&L	Full P&L	Full P&L	Full P&L
Profit & loss
Revenue (turnover)	£29.6m	£29.7m	£27.2m	£32.3m
Cost of sales	£22.8m	£24.5m	£23.5m	£28.4m
Gross profit	£6.8m	£5.1m	£3.7m	£3.9m
Operating profit	£4.8m	£2.8m	£1.3m	£1.5m
Profit before tax	£4.8m	£2.8m	£1.4m	£1.6m
Profit after tax	£3.9m	£2.4m	£1.2m	£1.8m
Profit (best available)	£3.9m	£2.4m	£1.2m	£1.8m
Staff costs	£5.2m	£5.6m	£5.3m	£6.6m
Employees (average)	88	89	84	102
Ratios
Profit margin	13.1%	8.1%	4.6%	5.4%
Gross margin	23.1%	17.3%	13.7%	12.1%
Revenue per employee	£337k	£333k	£324k	£317k
Profit per employee	£44k	£27k	£14.8k	£17.2k
Cash conversion	−87.7%	−126.8%	−176.9%	−6.7%
Growth (year on year)
Revenue growth	—	▲0.1%	▼8.3%	▲18.9%
Profit growth	—	▼37.8%	▼48.3%	▲41.3%
Headcount growth	—	▲1.1%	▼5.6%	▲21.4%
Balance sheet — indirect signals, not revenue
Cash at bank	£4.2m	£3.5m	£2.9m	£2m
Net assets	£4.4m	£3.3m	£2.1m	£2.7m
Fixed assets	£328k	£361k	£340k	£258k
Current assets	£9.1m	£6.5m	£6.6m	£7.4m
Debtors	£50.1k	£111k	£44.8k	£79.5k
Deferred income	£508k	£363k	£301k	£205k
Cash from operations	−£4.2m	−£3.5m	−£2.3m	−£101k
Source	FullAccounts · bulk data Dec 2023	FullAccounts · bulk data Dec 2023	FullAccounts · bulk data Dec 2024	FullAccounts · bulk data Dec 2025

Derived from the latest filing

How the business works

Profit margin: 5.4%; Profit ÷ revenue.
Gross margin: 12.1%; Gross profit ÷ revenue. High for software and services.
Revenue per employee: £317k; Revenue ÷ average employees.
Profit per employee: £17.2k; Profit ÷ average employees.
Cash conversion: −6.7%; Cash generated from operations ÷ operating profit. Needs a cash-flow statement.
Fixed assets ÷ revenue: 0.8%; Capital intensity. Low = capital-light, cheaper to start.
Deferred income ÷ revenue: 0.6%; Customers paying upfront (subscriptions, deposits). Approximate when combined with accruals.
Debtors ÷ revenue: 0.3%; 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: ▲26%; Now £2.7m
Cash at bank: ▼32%; Now £2m
Headcount: ▲21%; Now 102
Deferred income: ▼32%; Now £205k
Fixed assets: ▼24%; Now £258k

Deferred income is reported together with accruals in this filing (“accruals and deferred income”), so it is an approximate signal only.

Corporate ownership

Group structure

Ownership chain

Tonic Trustees Limitedultimate parent75–100%
A J Iles Holdings Limited75–100%
Tonic Construction Limitedthis company

Bands show the share of ownership each company holds in the one below it.

Sister companies (1)

A J Iles & Sons Plant LimitedFigures not disclosed

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

Same industry, similar size

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Sources

Companies House profile Filing history & original accounts

Latest figures from FullAccounts for the year to 31 Mar 2025 (profit £1.8m), from the Companies House accounts bulk data published Dec 2025. Spotted an error? Request a correction.

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