A garden room is a considered purchase. Nobody buys one on a Tuesday because they saw an advert on a Tuesday. They think about it for months, look at forty photographs, talk to a partner about whether it can be an office or has to be a gym, and then enquire with three companies in the same week.
That behaviour is what makes this niche work, and what most garden room marketing gets wrong. This page is what we actually run, with real figures from a live timber account.
Garden room marketing is the work of being one of the three companies somebody enquires with at the end of that months-long think, rather than one of the forty they scrolled past at the start of it. In practice that is two things at once. Paid social, which puts finished buildings in front of people who did not know they wanted one. And search, which catches them at the end, typing "garden office" and their county into Google with a budget in mind.
It is a niche that rewards patience and photography more than clever targeting. The companies that win usually have the best pictures of their own finished work.
On a live timber buildings account we run, Meta produced 158 leads at an average of £4.84 each over 90 days, from £764.94 of spend, reaching 37,302 people with 104,481 impressions. The window was 29 April to 27 July 2026, and those are Ads Manager figures for the whole account rather than a campaign we picked out.
Over a longer horizon the same account produced 360 leads at an average of £4.64 since June 2023. The best campaign inside that ran at £2.04 a lead. The worst, a traffic campaign, ran at £53.13, which is why it is not running any more.
Two honest notes, because the averages on their own would flatter us. That £4.84 is a 90 day blend, not a promise about next month: on the same account one recent month came in at £10.85 a lead against £5.73 the month before, on the same spend. And these are enquiry figures, not sales figures. What a lead is worth to you depends on your close rate and average build value, which we would want to know before saying anything about return.
The £4.84 is the headline and it is the least interesting figure on this page. We tested 19 creative variants to find it, and one of those 19 produced 230 of the leads on its own.
That is the method, and it is the part nobody advertises. There is no targeting setting that produces a cheap garden room lead. There is a slow, unglamorous process of putting nineteen photographs and nineteen first lines in front of the same audience and letting it tell you which one it wants. Any agency that gets a good number in month one got lucky, and luck does not survive the audience going stale in month four.
It also tells you what to ask an agency. Not what cost per lead they can get, but how many creatives they will make, how often they will replace them, and who takes the photographs.
Empty garden rooms photograph beautifully and sell badly. A room with a desk, a laptop and somebody working in it is a room the buyer can picture themselves in.
A lead form asking name, phone, roughly where and roughly what size will outperform a campaign sending traffic to a gallery page, every time.
They want the same building for completely different reasons, and one advert cannot speak to all three. Three sets of copy, one product.
Garden offices, gyms, annexes, timber frame studios. Search treats them as separate intents because buyers do.
The most common reason a garden room enquiry goes cold is that the buyer had a number in their head that was half of yours. A range filters those out before they cost you a site visit.
Enough to get through the creative testing, which is the real cost. The account above spent £764.94 across 90 days. A test that runs long enough to replace the creative twice tells you far more than a bigger budget spent in a fortnight.
The mechanics travel. Cost per lead moves with how many companies near you are advertising, which is why we would look at your area first.
Paid social is faster and stops when you stop paying. Search is slower, cheaper over time, and compounds. The channel by channel comparison is on construction lead generation.
Half an hour, no charge. We will look at what you rank for, what competitors are running, and whether your enquiry form is costing you leads. The longer version of the account above is in our timber case study, and the campaign mechanics are on our page about Meta ads for trades.
Knox Growth is a construction marketing agency working with UK garden room, timber building and trade firms. The full explanation of what a lead should cost you is on what a trade lead should cost.
