Are Facebook Ads Worth It for Builders? An Honest Answer

Short answer: yes, Facebook and Instagram ads can work well for a building firm, but only once your pages look professional and you know what a good enquiry is actually worth to you.

Run properly, they put your work in front of local homeowners who are planning a project right now. Run badly, they buy you likes from people three counties away who were never going to book anything. Here is how to tell the difference before you spend.

When ads earn their keep, and when they do not

Paid ads amplify. They do not fix.

Three things need to be true before you put money behind anything:

• You have real photos of finished work. Ads send people to look at you. If your Instagram has eleven posts and the last one is from 2023, you have paid to show a stranger a reason not to ring you.
• Your pages look like an active business. Clear service description, the area you cover, a way to get in touch, some evidence of recent work. This takes an afternoon and costs nothing.
• You can answer an enquiry quickly. This is the one builders underestimate. A homeowner filling in a form on a Tuesday evening is usually filling in three. The one who replies first has an enormous advantage.

If all three are true, ads can put your name in front of people considering an extension, a renovation or a loft conversion in your area. If any one of them is false, fix that first. It is cheaper.

What will it cost? Do this maths first

I am not going to quote you a cost per enquiry, because I do not know your area, your competition or what you are advertising, and anyone who gives you a figure before seeing those things is guessing.

What I can give you is the sum to do before you spend anything. It takes ten minutes and it is the difference between advertising and gambling.

Those numbers are invented to show you the method. Yours will be different, and nobody, me included, can tell you what an enquiry will actually cost you until the ads have run. That is what a test budget is for.

What that sum does is stop you panicking. Builders regularly turn ads off after a week because they spent £180 and got two enquiries, without working out that two enquiries were worth £1,600 to them.

On budget, my own recommendation is around £15 to £20 a day, which is roughly £450 to £600 a month, and to give it three months. Less than that and you are usually funding a learning period you never get the benefit of. That is my view based on how the platform behaves, not a promise about what it will return.

Why boosting a post is not advertising

The most common way a builder loses money is the blue Boost button.

Boosting takes a post that already exists and shows it to more people, usually with almost no targeting and no goal beyond engagement. You get cheap likes, a little dopamine, and no work. It feels like something happened. Nothing did.

A proper campaign is a different thing. It has an objective chosen deliberately, an audience defined by area and circumstance, ad copy written for one specific job rather than for everything you do, and a destination that makes enquiring easy. It gets tested, and the version that does not work gets turned off.

The difference is not budget. It is whether there was a plan.

What happens after the click

Almost nobody writes about this and it is where most builders' money actually leaks.

Decide before you launch where an enquiry lands. A form attached to the ad, a message, a WhatsApp, or a phone call. Each behaves differently. Forms get you more enquiries of lower average quality, because they take four seconds. A phone call gets you fewer and better.

Then decide who answers, and how fast. If you are up a ladder until six, that is fine, but somebody or something needs to acknowledge the enquiry before then. A one-line reply saying you will call tonight will hold a homeowner who would otherwise have moved on.

The best-targeted campaign in Britain dies quietly in an unread inbox.

What you are allowed to say in a builder's ad

This is the part most builders have never heard about, and it applies to you whether you run ads or just post on your own page.

The Advertising Standards Authority confirms that the UK ad rules apply to every business advertising in UK media, from a sole trader upwards, and that they cover claims and offers on your own social media channels and website, not only paid advertising space.

In practice, for a building firm:

• Claims need evidence. The ASA's own summary puts it plainly: "If you can't prove it, you probably shouldn't say it." "Cheapest in the area", "the region's leading builder" and "25 years experience" are all objective claims you would need to back up.
• Free has to mean free. You cannot describe something as free if the customer has to pay you anything for it beyond an uninflated postage cost. Free quotes are fine if the quote genuinely costs nothing.
• Offers need an end date. If you run a promotion, the closing date and the significant conditions go in up front, not in a reply to a comment.
• Prices must be complete. An advertised price has to relate to what is actually shown and include non-optional costs and charges.
• Reviews need permission. If you use a testimonial, you need evidence it is genuine, the person's contact details, and their permission to use it in marketing. Screenshotting a customer's Facebook comment into an ad without asking is exactly the habit this rule is about.

The bit that tends to focus minds: the ASA acts on complaints from members of the public and from competitor businesses, as well as its own proactive work. A rival firm can report your ad.

How to tell whether it worked

Judge ads on enquiries and booked work. Nothing else.

Likes, reach and impressions tell you the ad was seen. They do not tell you it worked, and every builder who has been sold a "great engagement" report knows the feeling.

You do not need software. A notebook will do. For each month, write down what you spent, how many enquiries came in, how many turned into quotes, and how many turned into jobs. Three months of that tells you more than any dashboard.

Then compare it against the number you worked out earlier. That is the whole test.

Ads or organic first?

Organic first, always.

Build an active, credible presence with real work on it, then put money behind it. If you have not done that yet, get your organic pages right first and come back to ads afterwards. Ads make a good page work harder. They cannot make a bare one work at all.

The honest bit

I cannot promise you a set number of leads from any budget, and anyone who does is guessing or hoping you will not check.

What is fair to say is this: ads reward builders who already look credible, respond quickly and know what a job is worth to them. If those three are not in place, paid advertising will find the weakness faster and more expensively than anything else you could do.

If you want this set up properly

If you would rather not learn objectives, audiences, testing and budgets yourself, that is the work I do.

Frequently asked questions

Source for the advertising rules section: Advertising Standards Authority and Committee of Advertising Practice, Advice for businesses. Accessed 20 August 2026. This is the ASA's own summary rather than the full CAP Code, and it is guidance rather than legal advice. The page carries no publication or last-updated date, so currency cannot be confirmed from the page itself.