How Much Do Google Ads Cost for Law Firms in the UK?

What actually drives Google Ads cost for a law firm?

Cost per click is an auction outcome, not a price list. Four things move it more than anything else: the practice area, the geography, the number of firms bidding on the same terms at the same moment, and the quality of your ad and landing page relative to theirs.

The first two set the range. Commercial and injury-adjacent terms sit high because the matter value is high and the bidding pool is deep. Volume family or conveyancing terms are cheaper per click but attract far more unqualified traffic, so the cost per *usable* enquiry can end up worse.

How do you model a Google Ads budget for a law firm?

Two lines of arithmetic get you most of the way, and both are honest about their limits:

1. 01Clicks = monthly budget ÷ average CPC. This tells you whether the budget buys enough traffic to learn anything at all in a month.
2. 02Website form enquiries = clicks × form conversion rate. A directional figure, useful for planning capacity.

Worked example, illustrative only: a £6,000 monthly budget at a £6.00 average CPC buys roughly 1,000 clicks. At a 3% website form conversion rate that is around 30 form enquiries a month, at about £200 per form enquiry. Halve the CPC and it doubles the clicks; halve the conversion rate and it doubles the cost per enquiry. Both levers matter equally, which is why landing pages are not an afterthought.

The Legal PPC calculator runs exactly this model against UK Keyword Planner benchmarks for a set of practice areas, so you can see how the range behaves before committing a budget.

Why does the calculator estimate form submissions and nothing further?

Because everything past a form submission depends on your firm, not on the auction. Phone calls are excluded because call volume is a function of how prominently the number is displayed and what the practice area is — some areas are overwhelmingly phone-led. Consultations depend on intake capacity and diary availability. New client instructions depend on qualification, fees, funding and how fast you respond.

A model that forecasts instructions is not being helpful; it is guessing about your business and calling it data. So the estimate stops where the arithmetic stops, and the rest gets measured — which is what the attribution model is for.

What does the cost look like once matter economics are included?

The only version of this question worth answering runs backwards from average matter value. If a typical matter in your chosen area is worth £3,000 in fee revenue and one in six qualified enquiries becomes an instruction, then £200 per enquiry produces roughly £1,200 of acquisition cost per instruction against £3,000 of revenue. Change the instruction rate to one in twelve and the same enquiry cost stops working.

• Average fee revenue per matter — by practice area, not blended across the firm.
• Enquiry-to-instruction rate — the number most firms have never measured for paid traffic specifically.
• Intake capacity — an enquiry nobody calls back within the hour is a cost, not a lead.
• Lifetime and referral value — real in private client and commercial work, easy to overstate; count it only if you can evidence it.

Those four numbers, not the CPC, decide whether Google Ads is a good purchase for your firm. Cost per lead is the metric that hides all four, which is the argument in why cost per lead is the wrong north star.

What is a sensible starting budget?

Enough to produce a readable month in one or two practice areas in a defined geography — not a token amount spread across six areas. If your modelled clicks for the month are in the low hundreds across several campaigns, you will not have enough signal to make decisions, and neither will Google's bidding.

Concentrating budget is almost always the better first move: one practice area, one tight geography, proper landing pages, tracking connected. Expand once the chain from search term to instruction is visible.