How much should a builder spend on a website and SEO? The maths, without the sales pitch
How to decide what a builder should spend on a website and monthly SEO: job value, close rate, the jobs you want, and what a one-off build cannot do.
By Daniel Stoychev, Webso Digital · 30 August 2026 · 7 min read
A builder should spend on a website what it takes to build one that closes recommendations and ranks for the town, once, and on SEO what the extra jobs justify, monthly, judged against the value of one extension. The first is a one-off and should be modest. The second is a retainer and should pay for itself several times over by month twelve, or stop. This guide is the maths for both, with no prices in it, because the numbers that matter are yours.
Two different purchases
A website is built once. A good one for a builder is a page per kind of job, a projects page, the areas, the people, and a quote form that reaches the phone. It is owned by you and it should not need rebuilding for years. SEO is monthly work: a page or project added, reviews asked for, mentions built, the profile kept right, the numbers read. The site earns the recommendation and the town; the monthly work earns the job searches. Confusing the two is how builders pay a retainer for a site nobody is feeding, or pay for a site and wonder why it does not rank for extensions.
The site: what modest means
The price of a builder's site is set by how many pages need writing properly, not by the size of the firm. Four to six job pages, projects and the rest is the standard. Anything that promises a site for the price of a takeaway is a template with your logo on it, and anything in the many thousands for a builder is paying for meetings. The signs of a fair quote: the pages are listed, the photos are yours, the hosting and care are included for a year, and you own the domain and the site at the end.
SEO: the arithmetic
Take the value of one job you want more of, after materials and labour, not turnover. Take how many enquiries turn into that job; for a builder who quotes properly it is often one in three, sometimes one in two for referrals. Take the number of extra jobs a month you actually want, remembering you have to build them. That gives you the enquiries a month the work needs to bring, and what those jobs are worth. Set that against the retainer. If one extension a quarter covers the year, the maths is easy; if the jobs you want are small, it may not be, and a cheaper site-only route is right.
The question to hold any agency to: how many enquiries a month, for which jobs, in which towns, by when, and how will I see it in Search Console? An answer with numbers is a plan. An answer about brand awareness is not.
What moves the price up honestly
- More kinds of job needing pages: a firm doing extensions, lofts, renovations, groundworks and commercial fit-outs has more to write than one doing extensions.
- More towns genuinely served: each needs evidence, projects and mentions, not a templated page.
- Two bases or a separate arm: separate profiles and pages, because Google treats them as separate businesses.
- More content each month: two projects a month builds faster than one and costs more because someone writes them.
What moves it up dishonestly
- 'Competitive market' surcharges. Competition changes the timeline, not the cost of the work.
- Bundles of things you cannot check: 'link building', 'brand strategy', 'content marketing' without a list of what is delivered.
- Long contracts to 'see results'. Three months is enough to see whether the work is being done; twelve months up front is a way to stop you leaving.
- Guarantees. Nobody controls Google; a guarantee is a sales device.
When not to spend at all
If you are booked for a year with the work you want, from people you like, at your price: a small site that closes recommendations and a correct Google profile is enough, and no retainer. Spend on SEO when you want to change the work, not just get more of it: more extensions, fewer small jobs, a new town, a specialism. The retainer is a lever for choosing, and it is worth most to a builder who can afford to be picky.
How to know it is working
By month three, impressions rising in Search Console for the job searches in your towns. By month six, enquiries you can trace to the site and the profile, with the job and the town in each. By month twelve, the arithmetic above coming true, several times over. Any agency should show you these numbers from Google's own tools, not from a dashboard of their own, and should tell you at month six if they are not coming.
Questions on this topic
Is a cheap website better than none?
A small site with your real photos, a page per kind of job, the towns and a working form beats nothing by a long way, and beats a template with stock photos. It is the photos, the job pages and the form that matter at the cheap end, not the design.
Should I pay monthly for the website?
Some firms sell sites as a subscription you never own. Prefer a one-off build you own with a modest annual care fee. If you need to spread the cost, spread it, but own the site at the end.
What is the minimum useful SEO?
A correct Google profile and a review routine, which you can do yourself, plus one job page done properly. If you can only afford one thing monthly, it is the profile and the reviews.
Do I need SEO if I am on Checkatrade?
The platform sends shared leads and keeps the relationship. SEO sends the homeowner to you. Most firms use the platform early and grow out of it as the site and profile take over.