Google Keyword Planner is a free research tool inside Google Ads built for advertisers planning paid search campaigns. You put in words or phrases related to your business, and it gives you keyword ideas along with estimated monthly search volumes. That's the core of it.
Most of the contractors and home service businesses we work with have heard of it. Very few actually use it correctly — or understand what it is and isn't good for.
What it was built for (and what it wasn't)
Google built Keyword Planner for people running pay-per-click ads. The tool's job is to help advertisers find keyword ideas, estimate search demand, and plan ad group structures before spending money on a campaign.
It was not built for organic SEO. That distinction matters a lot.
When you use Keyword Planner without an active Google Ads campaign, Google shows you search volume as wide ranges — "1K–10K searches per month" — instead of specific numbers. According to Google's own documentation, precise monthly search volume is only available to accounts actively spending on ads. Everyone else gets buckets.
That's frustrating if you're trying to prioritize a content strategy based on exact search volume. A keyword showing "1K–10K" could be 1,200 searches or 9,800. Those aren't the same decision.
So why use it at all? Because the keyword ideas themselves are genuinely useful, and the tool is free.
What Google Keyword Planner actually does
There are two main workflows inside the tool:
Discover new keywords. Type in a word, phrase, or your website URL, and the planner returns a list of related keyword ideas. For a roofing contractor, entering "roof repair" might surface "roof leak repair," "emergency roof repair," "flat roof repair," and dozens of variations you might not have thought of. Each comes with a volume range, competition level (low/medium/high based on advertiser competition, not organic), and a suggested bid range.
Get search volume and forecasts. Paste in a list of keywords you already have, and the tool shows historical search volume data plus performance forecasts if you were to run those as ads.
For organic SEO purposes, the "discover new keywords" function is where most of the value is.
How to access it
You need a Google account and a Google Ads account. When you first create a Google Ads account, Google will try to push you through a campaign setup flow — you can skip it by selecting "Switch to Expert Mode" before completing the process. Once you're in Expert Mode, the Keyword Planner is under Tools > Planning > Keyword Planner.
You do not need to run ads or enter a credit card to use the tool. You do need to complete the initial account setup.
What it's actually useful for
For a roofing contractor or home service business trying to do better SEO, here's where Keyword Planner earns its keep:
Finding keyword variations you're missing. Type in your core service and your city. The planner will surface long-tail variations — "emergency roof repair after storm," "hail damage roof inspection," "flat roof replacement contractor" — that represent real search intent from homeowners with a specific problem. These are often easier to rank for than the head term.
Sanity-checking keyword ideas. If you're wondering whether "metal roof vs shingles" gets any search volume or whether it's a waste of time to write a page about it, the volume ranges give you a rough signal. Low/medium/high isn't precise, but it tells you whether you're chasing something real.
Grouping related keywords. The planner organizes suggestions into topic clusters. That structure maps well to how Google thinks about topical relevance on a site — and it gives you a starting framework for planning out a content calendar or service page architecture.
Understanding seasonal demand. The monthly search volume graph shows you whether a keyword spikes in spring, flatlines in winter, or stays consistent year-round. For a roofing contractor, knowing that "roof inspection" searches spike in March and September helps you time your content pushes.
What it isn't good for
Search volume in buckets is the obvious limitation. But there are a few others worth knowing about.
The competition column in Keyword Planner reflects advertiser competition for paid ads, not organic ranking difficulty. A keyword showing "Low" competition might still be dominated organically by large sites with years of authority. Don't confuse the two.
Keyword Planner also skews toward head terms and commercial intent — the kind of searches people run right before making a purchase. Informational searches ("how do I know if my roof has hail damage") often show as low volume or don't appear at all, even when they drive meaningful organic traffic. If your content strategy is entirely built around what Keyword Planner surfaces, you'll miss a lot of the upper-funnel audience.
And the tool has no visibility into how well your site ranks for anything, what your competitors are ranking for, or what keywords are already driving you traffic. For that you need Google Search Console, which is free and far more useful for understanding your current organic performance. If you want to see what a proper keyword-to-content strategy looks like in practice, our work section has examples.
How service businesses should actually use it
Start with your services. Enter each of your core service types plus your city. Don't stop at the first page of results — scroll through and look for variations that match the way your customers actually describe their problem, not the way you describe your service.
Pay attention to geographic modifiers. "Roof repair Denver" and "roof repair Denver CO" and "Denver roofing contractor" are different keywords with different volumes and different user intent. The planner will surface many of these variants at once.
Export the list. Download the keyword ideas to a spreadsheet and group them by service type and intent. This becomes the foundation for deciding which service pages to build, which pages to expand, and what topics to cover in your article content.
Cross-reference with Search Console. Once you've built pages targeting these keywords, Search Console tells you which ones are actually sending traffic and which ones your site is showing up for but not ranking well enough to click. That feedback loop is where real optimization happens.
The bottom line
Google Keyword Planner is a useful starting point for keyword research, especially if you're not ready to pay for dedicated SEO tools. It's free, it's directly connected to Google's data, and the keyword discovery function surfaces real search demand from real users.
Its limitations are real: no precise volume without active ad spend, competition data that reflects paid not organic, and a blind spot for informational intent. Use it for ideas and directional signals, not as a precision instrument.
If you want help turning keyword research into a content and service page strategy that actually moves your rankings, that's what we do.