Gray Siding Colors: Upload Your House and Compare Undertones

Gray siding can read blue, green, warm or cool depending on its undertone and the light. Upload a photo of your house below to try a gray, then read what published sources say about undertones and trim.

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Before and after examples

Example images are AI-generated: both the sample houses and their redesigns. Results change from render to render, so treat them as concepts, not exact product matches.

AI-drawn generic stand-in of a suburban two-story house with beige lap siding, white trim, a black roof and a navy front door — Example 1 (prompt 1 below; the before is an AI-drawn generic stand-in house, not a real photo): beige siding became a pale gray that reads bluer than the "light cool gray" we asked for. The white trim, the black roof and the shutters and door look the same.

The same house with pale blue-gray lap siding; the white trim, black roof and shutters and door kept — Example 1 (prompt 1 below; the before is an AI-drawn generic stand-in house, not a real photo): beige siding became a pale gray that reads bluer than the "light cool gray" we asked for. The white trim, the black roof and the shutters and door look the same.

AI-drawn generic stand-in of a ranch house with light yellow lap siding, white trim, a brown roof and a brick walkway — Example 2 (prompt 2 below; the before is an AI-drawn generic stand-in house, not a real photo): light yellow siding became a gray-taupe. We asked for a warm mid-gray, but it reads darker than that. The brick walkway, the white trim and the brown roof look the same.

The same ranch house with gray-taupe lap siding; the white trim, brown roof and brick walkway kept — Example 2 (prompt 2 below; the before is an AI-drawn generic stand-in house, not a real photo): light yellow siding became a gray-taupe. We asked for a warm mid-gray, but it reads darker than that. The brick walkway, the white trim and the brown roof look the same.

AI-drawn generic stand-in of a two-story house with white lap siding, white trim, a gray roof and a red front door — Example 3 (prompt 3 below; the before is an AI-drawn generic stand-in house, not a real photo): white siding became a dark slate that reads navy blue, not gray. The white porch columns, the cream shutters and the gray roof look the same. The blue undertone is the heavy kind Northern Nester warns about.

The same house with dark navy-slate lap siding; the white porch columns, cream shutters and gray roof kept — Example 3 (prompt 3 below; the before is an AI-drawn generic stand-in house, not a real photo): white siding became a dark slate that reads navy blue, not gray. The white porch columns, the cream shutters and the gray roof look the same. The blue undertone is the heavy kind Northern Nester warns about.

What the AI can and cannot do

It can recolor the siding in your photo while usually keeping the shape of the house, so you can compare colors before you order samples.

It cannot control an undertone precisely. In our examples a request for light cool gray came out pale blue-gray, and a request for dark slate gray came out navy. Check the whole image and describe the undertone you want.

How to choose a gray siding color

The points below come from Brick and Batten (a design blog), Northern Nester (a home blog) and LP (a siding maker). LP sells siding. Sources were read on 24 October 2026. Some of them sell siding or lead homeowners to local pros, so treat the color advice as sales-adjacent.

Question	What the sources say
Undertones	Gray has blue, green, brown (greige) and taupe undertones. Cool grays read crisp and warm grays softer (Brick and Batten).
Risk	Heavy blue undertones risk a "battleship" look (Northern Nester).
Paint examples	Brick and Batten pairs Benjamin Moore Thunder with Steam trim, Chelsea Gray with Seapearl, Raccoon Fur with Alabaster and Wrought Iron with black trim. These are paint names, not siding matches.
Changing light	Revere Pewter reads warm or cool depending on the light (Brick and Batten).
LP suggestions	LP names Snowscape White, Quarry Gray and Summit Blue as cool siding colors for gray or black roofs, with Abyss Black, off-white or dark gray trim, and advises against beige trim.
Dark gray	Dark gray siding with black trim can blend; allow a clear value difference (Brick and Batten).
Order	Pick the siding first and the door last (Northern Nester).

Three grays to try

Light cool gray. Example 1 turns beige siding pale blue-gray, bluer than a pure gray.
Warm mid-gray (greige). Example 2 turns light yellow siding gray-taupe, darker than we asked for.
Dark slate gray. Example 3 turns white siding a dark navy-slate that reads blue.

How to try a siding color on your house

The examples were run directly on an image model, not through the tool above, so your results will look different.

Photograph the front in daylight, straight on, with the whole house in the frame.
Upload it in the tool at the top of this page, or open the exterior designer, and choose a style.
Name the color and what must stay the same, like the prompts below.
Compare two or three colors and note which parts moved.

The exact prompts behind the examples

These are the edit prompts used for the three examples, word for word. Swap in the color and the list of what stays.

Prompt 1: light cool gray

Change ONLY the color of the lap siding: repaint it a light cool gray. Keep the white trim, the black roof, the navy front door, the driveway and the lawn exactly the same, and keep the camera angle.

Prompt 2: warm mid-gray (greige)

Change ONLY the color of the lap siding: repaint it a warm mid-gray (greige). Keep the white trim, the brown roof, the brick walkway, the front door and the lawn exactly the same, and keep the camera angle.

Prompt 3: dark slate gray

Change ONLY the color of the lap siding: repaint it a dark slate gray with a slight blue undertone. Keep the white trim, the gray roof, the red front door, the driveway and the lawn exactly the same, and keep the camera angle.

Before you order siding

Order real samples and look at them outdoors, morning to evening.
Pick the siding first, then trim, then the door.
Compare cool and warm grays against your roof and any brick.
Check your HOA or town for color rules.

Who this is for

Homeowners choosing between gray siding shades who want to see the undertone on their own house before ordering samples.

More siding and color ideas

Frequently asked questions

What trim goes with dark gray siding?

LP suggests black, off-white or dark gray trim with gray siding, and Brick and Batten warns that dark gray with black trim can blend. Allow a clear value difference.

Warm or cool gray for my roof?

LP names cool grays for gray or black roofs. We found no rule for other roofs, so test with a render.

What is the best front door color for a gray house?

No source we read gives one. Northern Nester says to pick the siding first and the door last.

Why does my gray look blue?

Gray often has a blue undertone, and light and nearby sky can strengthen it. Brick and Batten and Northern Nester both warn about heavy blue undertones.

Can I see a gray siding color on my own house first?

Yes. Upload a photo of your house in the tool at the top of this page and name the color to try. A render is a guide only; test real samples outdoors on all sides of the house.

Will the render match a real gray siding color?

No, not exactly. In our examples the model drew its own idea of each color. Use the render to narrow your choices, then compare real color samples.

Is this tool free?

Signing up is free and gives you 5 credits, which is enough for 2 renders in most countries. Free renders carry an AiExterior watermark. If you want more renders or clean images, paid plans are available on the pricing page.

Do I need an account?

Yes. You need to sign in before a render starts, with an email code or your Google account.

Try it on your own house

Upload your house photo

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