The Engine Under the Hood
Picture two identical vans parked side by side. Same color, same body, same signage. One has a V8 engine. The other has an engine held together with cable ties and wishful thinking. You cannot tell from the outside. The moment you turn the key, the difference is obvious.
Most plumbing websites look perfectly fine on the surface. A logo, some photos, a phone number, a contact form. What runs underneath determines everything: how fast the page loads, how Google scores it, and how many customers it actually brings in. The technology stack under the hood is invisible to visitors, but Google measures it on every single crawl.
This article explains, in plain language, what we build on, why it matters, and why almost no one in your industry has figured this out yet.
What Most Websites Actually Do (The Flat Pack Problem)
When someone visits a website built on WordPress or Wix, here is what actually happens behind the scenes.
The server sends the visitor’s browser a flat pack kit. Not a finished product. A bundle of HTML and between 300 and 800 kilobytes of JavaScript code that the browser has to download, unpack, and assemble before it can show anything on screen. It is the equivalent of being handed a flat pack wardrobe in a box instead of the finished piece of furniture. The instructions are in there. The parts are in there. But you have to put it together first before you can use it.
On a laptop with a fast connection, this assembly process takes 2 to 4 seconds. On a mobile phone, which is how more than 60% of people search for local tradespeople, it takes 4 to 8 seconds. Most visitors leave before it finishes. They are not being impatient. Research consistently shows that 53% of mobile users abandon a page that takes more than 3 seconds to load.
This is why plumbing websites built on WordPress or Wix consistently score between 20 and 72 on Google’s mobile speed test. The test is measuring how long the browser spends stuck in the assembly process.
What Astro Does Differently (The Pre-Built Approach)
Astro skips the flat pack entirely.
Instead of sending the browser a kit to assemble, Astro builds the finished page in advance and stores it ready to go. The moment someone arrives at the site, they receive the complete, finished page. No unpacking. No assembling. No executing code. The browser just displays what it receives.
Think of it as the difference between a pre-made sandwich and being handed bread, butter, cheese, and a knife and being told to make your own. The end result looks the same. The experience of getting there is completely different.
Because there is no JavaScript to execute before the page appears, the page appears immediately. That is why our sites consistently hit 95 to 100 on Google’s mobile speed test, with 0 milliseconds of blocking time. There is nothing to block.
Why Google Uses This to Decide Who Ranks
In 2021, Google made page load speed an official ranking factor through a set of measurements called Core Web Vitals. These are three specific tests Google runs on every page it crawls: how fast the main content appears, how long the page is blocked before it responds to clicks, and how much the layout shifts around as it loads.
Astro sites pass all three because there is nothing slowing them down. The page is pre-built, so it loads immediately. There is no JavaScript blocking the response time. The layout does not shift because everything is already in the right place when it arrives.
WordPress and Wix sites frequently fail all three because the JavaScript they execute before anything appears is exactly what Core Web Vitals is measuring. The score you see on Google’s PageSpeed tool is not just a number. It is a direct input into how Google decides who ranks above whom.
Google has stated publicly that two sites with equal content will not rank equally if one loads significantly faster than the other. A site that passes Core Web Vitals gets a genuine structural advantage in search rankings. It is not a guarantee of page one. Nothing is. But it removes a ceiling that most plumbing websites are bumping against without knowing it.
The Companies That Use It
Astro is not a new experiment built by a startup chasing trends.
Since its release it has been adopted by engineering teams at some of the largest organisations in the world. Microsoft uses it for documentation and product pages. NASA uses it for public data portals. The Guardian uses it for global news delivery. Porsche uses it for brand web experiences. Michelin uses it for their international web presence.
These organisations have access to every web technology in the world. Budgets that could afford anything. Engineering teams that evaluate every option carefully. They chose Astro because it is the fastest way to deliver content to a browser at scale.
You can see the full verified list at astro.build.
Why Almost No Plumber Has This
Here is the part that matters most for your business.
Astro is not a drag-and-drop builder. There is no template marketplace, no plugin store, no dashboard you log into to move things around. It requires real technical knowledge to use, and the people who have that knowledge typically work for large tech companies or specialist agencies, not for local tradespeople.
Most web developers who work with small businesses have never used Astro. Many have never heard of it. The trades industry is, broadly speaking, 5 to 10 years behind the mainstream web in terms of the technology being used. The typical plumbing website is built on WordPress with a downloaded theme, running a stack of plugins, scoring somewhere between 20 and 72 on Google’s mobile speed test.
Your site scoring 95 to 100 on the same test is not a marginal improvement. It is a different category entirely. It is the difference between a vehicle that passes its MOT and one that is ready to race.
The window for this advantage is open right now, because so few people in your industry know it exists. That window will not stay open indefinitely.
What This Means for Your Google Rankings
Organic SEO has many factors: reviews, written content, backlinks, your Google Business Profile. But technical performance is the foundation all of those factors sit on.
A slow site with great content will lose to a fast site with decent content. Google will not rank a page it considers technically poor regardless of how good the writing is. It will not put a 35-scoring mobile site above a 98-scoring mobile site when the content is comparable. The scoring exists precisely to stop that from happening.
Building on Astro means you start every SEO effort from a position of technical strength that your competitors simply do not have. When you add good content, you are not fighting against your own website. When you earn reviews and backlinks, they land on a page that Google already respects. The technical foundation amplifies everything else you do.
It will not get you to page one overnight. Nothing will. Organic SEO takes time, and anyone who tells you otherwise is selling something. But it removes a ceiling that most plumbing websites are permanently stuck below, and it gives you a compounding structural advantage every month you are live.
The Short Version
Two websites. Same content. Same area. Same reviews. One loads in under a second. One takes 4 to 8 seconds on mobile. Google puts the fast one above the slow one. Full stop.
Most plumbing businesses are the slow one, and they do not know it. If your site is built on Astro, you are the fast one. In an industry where almost no one has made this switch yet, that is an unfair advantage. The kind that compounds over time while your competitors are still wondering why they are not ranking.
Sources: Google Search Central, Core Web Vitals documentation (2021). HTTP Archive Web Almanac 2025, CMS performance chapter. Astro, astro.build/showcase.