ᐅ Differences Between Prefabricated Houses and Alternative Building Methods?

Hello,

I am new to this forum and not entirely sure if this is the right place for my questions. We are planning to build a house within the next two years, and I’m starting to feel a bit overwhelmed because I can’t find clear—and especially neutral—answers to my questions.

I’m already uncertain whether to choose a prefabricated house or a solid (conventional) house. There is also something called a “prefabricated solid house” that many people mention, but I have never really found any information on it because all I come across are pages from prefabricated house manufacturers.

Nowadays, almost every prefabricated house supplier advertises how energy-efficient their houses are. However, the materials used in the construction and the advantages they bring are only revealed in personal conversations. Naturally, every manufacturer uses different materials and claims theirs are the best.

Most prefabricated houses are apparently mainly built from wood and drywall panels (at least on the inside). While energy efficiency is very important to me, it’s also crucial that the house isn’t noisy and that I can hang my 40kg (88 lbs) TV on the wall without the wall collapsing. And, of course, that the house still stands after a storm...

Does anyone here really understand the differences between the various prefabricated house manufacturers—not just in terms of service and price, but in quality? And what exactly is behind a “prefabricated solid house”? I imagine it involves masonry or concrete walls being delivered ready-made...

I would be very grateful to anyone who could shed some light on this!

Best regards!

Hello,
I can’t give you a comprehensive answer based on personal experience with prefab houses, but I’ll try to share some helpful information.

The market is definitely large and very diverse. I don’t think it’s possible to say that timber frame construction is always better, or that precast concrete elements are better... Without detailed research, it’s hard to make a decision, and finding a “right” answer will be difficult for anyone.
Prefab house and traditional masonry construction are not mutually exclusive terms. You might mean prefab or brick-and-mortar construction, or building on site.
Even here, you can’t generally say that one or the other is definitely better.
No one can have a full overview of all prefab house providers anyway.

A prefab house is not automatically cheaper everywhere. It can be built faster, but there are limits, as the interior finishing work is usually the most time-consuming part.
You’re already asking the right questions about soundproofing and load-bearing capacity of the walls. Once you know your requirements, you can evaluate the materials and systems accordingly. You still have to decide if health-related, insulation, fire protection, or ecological aspects are important to you.

My advice for how to proceed would be this:
First, narrow down your options based on which providers are available in your area.
I would only want to build with a company that has its headquarters (or a branch office) close by, and ideally good connections to local tradespeople. (If you’re going for a turnkey solution or a complete package.)
If you can find people who have successfully and satisfactorily built with that provider, I’d put them on your shortlist.
Most importantly, clarify your own needs first — this is the key step for any house.
Later, definitely get several quotes and don’t stick with just one company right away. (Unfortunately, a price quote means very little if the details are not yet specific or if you’re still changing many things later. But you can always ask approximately what construction costs per square meter (square foot) you should expect; this can help identify providers who would exceed your budget from the start.)

Maybe there is a home building fair or a model village with several providers near you, where you can ask questions and get quick answers.

A storm will definitely not blow away a timber frame house. However, you can only attach things like a TV or shelves on the walls where there is a stud or beam. For a weight of 40 kg (88 lbs), you might need to distribute it on two studs, but only the specific provider can tell you for sure.
Drywall (e.g. gypsum board) and insulation materials like mineral wool or wood fiber insulation tend to absorb moisture, and drywall can develop mold quickly. This put us off a bit. Although you could also argue that you’d first have to have a pipe burst or something like that. Then the representative said that with timber frame construction it’s actually very quick to replace drywall and insulation and get the wall dry again faster than with any other system or masonry.
One prefab provider with timber frame construction and fiberglass boards without formaldehyde was simply way too expensive for us in the end.
After a long search, we chose a brick-and-mortar provider who met our requirements without major extra costs and with whom others nearby had good experiences. Whether prefab or not didn’t matter to us in the end.
The construction method can be irrelevant; the result is what counts.

Best regards

We were in this phase ourselves about six months ago. Here’s how we approached it:

There are two large model home parks near where we are building. We visited each of them three times, so six times in total, four of those visits were scheduled appointments with the builders. Before that, we did a lot of research online about prefabricated houses and traditional solid construction. As you probably guessed, both have their pros and cons. Once we knew what kind of house we wanted (how many square meters (square feet), floor plan, etc.), we made appointments and really grilled the salespeople. There wasn’t much difference in the wall construction between the manufacturers. One uses rock wool, another wood fiber, and yet another swears by hemp. What was and is important to us: no polystyrene (Styrofoam) in the walls! Efficiency is a tricky subject. In our opinion, there’s a huge subsidy system behind it, like the KfW incentives. Every house can meet the criteria without actually having it proven on paper (and most do!).

In the end, we received three offers from three different companies after meeting with them. The outcome was this:

We then went with our ideas to a local traditional home builder. I like to put it in numbers:
For the same floor plan with the same extras like technical equipment, electrical installations, and plumbing (we wanted some extras here and there), we pay over €25,000 (about $27,000) less with the regional solid construction company!

That was reason enough for us to continue asking around and gathering offers from local solid builders. In the end, I was simply convinced by conventional masonry construction. Nothing really compares to a robust 37cm (14.5 inch) brick wall— but of course, everyone has to decide that for themselves.

P.S. Just so I don’t forget: in theory, most drywall systems like Fermacell or gypsum boards can hold anchors supporting between 50 and 80 kilograms (110 to 176 pounds).

Except for the very cheap prefabricated wooden house suppliers, there is always a wood-based panel beneath the drywall. I would argue that a screw in it usually holds better than most anchors in a masonry wall.

I believe that in sand-lime brick, a screw in a wall plug will hold until it breaks. You can't get more in wood either.

So, you don’t need to worry about the storm resistance of a prefabricated house or whether the walls can support your TV. We have fully stocked kitchen cabinets mounted on the walls, bathroom vanities, and our TV as well—and I promise you, our walls are still intact, and so is everything inside the cabinets.

Nonetheless, we are building a second house using solid construction. Our most important criteria were price and quality. As already mentioned, solid houses were always priced below good quality prefabricated houses. Additionally, it was important to us that, if possible, there would be no more polystyrene insulation in the walls. That’s why we are building our new house without insulation (except for the insulated foundation slab).

First, think about WHAT you want. Do you want to build using mostly natural materials, or do you prefer a structure insulated with polystyrene? Both options are available in solid construction as well as in prefabricated houses. Then, consider the size and features you want and simply ask for non-binding quotes to get an idea of the costs. However, you should also be aware that with a solid house, you generally have more flexibility to make changes even after construction has started. For example, you can decide on the placement of electrical outlets on site and don’t have to plan weeks in advance where you want each outlet. This is often—but not always—the case with prefabricated houses. Bathroom layouts and everything else are usually finalized before you’ve even stepped inside the room for the first time.