Once the foundation question is settled, this is the next thing everyone asks: can I build this myself, or do I need to hire someone? It's a fair question with real money riding on it, and the honest answer is — it depends on you, your time, and which options you've chosen.
Let me give you the straight version, including the part most sellers skip.
Can you install a greenhouse yourself?
Yes — a Janssens greenhouse is assemblable by a skilled DIYer, and plenty of our customers build their own. The manuals are thorough, the aluminum framing goes together methodically, and there's genuine satisfaction in standing inside something you built. But budget real time: this is a multi-weekend project, not an afternoon.
Two things make DIY go smoothly. First, patience — you're working through a detailed sequence, and rushing tempered glass is how glass gets broken. Second, the right tools. These greenhouses are engineered in Belgium using the metric system, so a metric or combination tape measure isn't optional — it's the difference between clean measurements and constant conversion errors.
If you're handy, methodical, and have a couple of free weekends, self-installation saves you real money. If that's not you, that's completely fine too — which brings us to the honest trade-offs.
What's the hardest part of building a greenhouse?
For most builders, the single hardest part is the hinged doors. They're a handsome upgrade over sliding doors, but they're significantly more challenging to install — they inset into the frame with rubber gaskets and adjustable hinges, and getting them to seat and swing correctly takes patience and, sometimes, a grinder.
This is why we tell people: even many capable DIYers hire out the hinged doors specifically. You build the structure yourself and bring in a skilled handyman for the one piece that's genuinely fiddly. There's no shame in it — it's the smart split. (If you'd rather keep the whole build simple, sliding doors are far more forgiving; our sliding vs. hinged doors guide lays out the choice.)
The other reality: glass and windy days don't mix. Assemble only in dry, still weather, and give yourself about 30 inches of clearance around the structure so you can safely handle ladders and glazing.
When should you hire a contractor?
Hire out the install when any of these are true:
- You don't have the time. A multi-weekend project competes with everything else in your life.
- The site is complicated. Slope, tricky access, or a knee wall raises the difficulty.
- You've chosen hinged doors and don't want to fight them.
- You'd simply rather it be done right, once, by someone who's done it before.
Here's the difference that matters: our installers do this repeatedly. They know the Janssens system — the sequence, the quirks, the door adjustments — which is a meaningful step up from a general handyman learning it on your build. Experience on this specific product is worth paying for.
What does professional installation cost?
We'll give you the honest answer here too: we don't install directly, and we won't quote a national average, because it would be wrong for most people reading it. Installation pricing depends on your location, your site, the model, and the installer's schedule.
What we do have is a network of qualified installers across the United States. Send us your zip code and we'll get you a real quote for your actual site — not a guess. That's the only number worth having.
This is genuinely a gap nobody else in this market fills. Most greenhouse sellers hand you a box and wish you luck. We help you find the person who'll build it. For how installation fits into your total spend, see our full cost breakdown.
So — DIY or contractor?
| Build it yourself if… | Hire a contractor if… |
|---|---|
| You're handy and methodical | You're short on time |
| You have a few free weekends | Your site is sloped or tight |
| You chose sliding doors | You chose hinged doors |
| You want to save on labor | You want it done right, once |
There's no wrong answer — there's the answer that fits your situation. Many buyers land in the middle: build the frame themselves, hire out the doors or the trickiest glazing. That's often the best value of all.
Not sure which way to lean? Call us or send your zip code. We'll talk through your model, your site, and your comfort level, and either walk you toward a confident DIY or get you a real installer quote. Either way, you won't be left alone after the sale — that's the whole point of buying from us.