A sunroom costs about $15,000 to $50,000. A three-season room runs $15,000 to $30,000; a four-season room with heating, cooling, and full insulation runs $30,000 to $50,000 or more. Prefab kits sit at the low end and custom-framed additions at the top. The biggest swing is whether you want a room for nice days or one you can live in through winter.
We build websites and SEO for remodelers, sunroom installers, and contractors, and we run our own home-service companies. Here's where the money goes and when an addition isn't the right call.
Screened or single-pane glass on an existing patio, no insulation or HVAC. Great for spring through fall, not for winter. The most affordable way to add covered outdoor space.
A manufactured insulated room assembled on site, with insulated glass and the ability to add HVAC. Faster than custom and a middle-ground on price.
Site-built and matched to your home, fully insulated and tied into heating and cooling. It counts as living space and costs the most, but it lives like a real room.
It's a large project, so it's worth being honest about fit. Reconsider if:
A sunroom earns its cost when you'll actually live in it year-round and the four-season build fits your budget. If it's a sometimes-space, a screen room or patio cover gets you most of the joy for much less.
If you build sunrooms and additions, a page like this brings in homeowners researching a five-figure project who want a contractor they can trust. We hand-build the site, add 24/7 AI lead capture, and publish researched cost guides every month. Plans run $249/mo for the site plus lead capture, $597/mo to add the monthly SEO engine, and from $1,750/mo for the full CRM and reputation stack. Month-to-month, and you own everything. See general contractor website design, SEO for contractors, or what local SEO costs.
We don't post stock testimonials. On a 15-minute call we screen-share the real dashboards behind our own businesses — live leads, rankings, and the exact page that produced each one. See the proof →
Three-season is usable spring through fall and costs less; four-season is insulated and heated for year-round living and costs more. Choose by how you'll actually use the room in winter.
Almost always for an enclosed four-season addition, since it ties into structure and HVAC. Screen rooms sometimes need one too. Your contractor should pull permits as part of the job.
A prefab kit can go up in one to two weeks. A custom four-season addition with a new foundation takes four to eight weeks, plus permit and inspection time.
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