How to Visualize a Sunroom Addition Before You Build It

A sunroom is one of the few additions most homeowners can picture clearly before they build it — a glass-walled room off the back of the house, usually off a kitchen or living room, built to bring the yard in. It's also one where the gap between "I can picture it" and "here's what it actually looks like on my house" costs the most to close the wrong way: a slab, a roofline tie-in, and a run of glazing aren't cheap to redo. Here's how to see it on the real house from one photo in a few minutes, and exactly where the result stops being something you can build from.

Step 1: Shoot the wall it's going to attach to

• Photograph the exterior elevation where the sunroom will sit, straight-on if you can — the tool reads the wall, the roofline, and the siding it has to tie the new addition into more reliably from a flat angle than a steep one.
• Get the roof eave and enough of the foundation line in frame for the new structure to read as attached to the house, not floating beside it.
• If the room is going over a patio or deck you already have, a photo with that slab or decking visible helps the tool understand what it's building on top of.

Step 2: Add the sunroom on the outside

Upload the exterior photo to Exterior AI and write the prompt as instructions for what's new: "add a glass sunroom addition off the back wall, aluminum-framed glazing on three sides, a shed roof tying into the existing roofline, matching the house's siding on the end walls." Leave Structure Lock off here — it defaults off on Exterior AI specifically because adding a sunroom is a change to the massing, not just the materials. Each run is 100 credits.

Step 3: Furnish it on the inside

Upload a photo of the wall or room the sunroom will open off of to Interior AI and set the room type to Sunroom — one of 22 room types, paired with any of 24 styles. Describe the specific finish, not a mood: "wicker lounge chairs, a ceiling fan, painted beadboard ceiling, large-format tile floor that reads as an extension of the patio outside." Leave Structure Lock off; turning an exterior wall into an opening onto a new room is exactly the kind of change it's designed to allow. Each run is 100 credits.

Step 4: Working from a sketch instead

If you've already sketched the addition — the footprint against the existing wall, the roof pitch, where the glazing starts and stops — run that sketch through Sketch to Image with Structure Lock on. It's designed to hold the lines you drew rather than reinterpret them, which matters here once you've settled on a footprint and don't want the tool proposing a different one.

Step 5: Compare directions before anyone pours a slab

At 100–100 credits a run, it's cheaper to compare a shed roof against a gable, or aluminum frames against a painted wood look, than to pour a foundation and decide you wanted a different roofline. Run the exterior and interior separately — each is a smaller, more specific change for the tool to make than one prompt trying to do both.

Where this is not enough

A sunroom looks simple from the outside, but it carries a few decisions a photoreal image can't make for you — be clear about what the render is before anyone relies on it for a decision that costs money.

• It's a presentation visual, not a permit or structural drawing. The new foundation, how the roof framing ties into the existing structure, and whether the wall it's attaching to can take the connection are all questions for a licensed contractor or engineer, not something the image resolves.
• It can't tell you three-season from four-season. Whether a sunroom is unheated glazing for three seasons or insulated, tied into the house's HVAC, and usable year-round is a construction and budget decision, not a style choice — the render can show glass walls either way, and it won't tell you which one you're looking at or what it costs to get there.
• Setbacks catch sunrooms more often than the rest of the house. A rear or side-yard setback that the existing walls already comply with can still block an addition that reaches closer to the property line — check with your local planning department before you commit to a footprint.
• It redraws the whole frame, including what you didn't mention — expect the roofline, the siding texture, or the patio in front of it to shift slightly even when the prompt only asked for the sunroom itself. Compare the result against the original before you call it final.
• For a measured, exportable 3D model of the addition's footprint — one you can section, dimension, and hand to a contractor for pricing — model it in Design Studio instead, included with every account.