Introduction

You have a room you don’t love, a rough idea of what you’d rather see, and zero desire to learn CAD software or pay $2,000 for a mood board.

That’s exactly the gap Nano Banana room design fills.

Upload a photo of your actual bedroom, describe the look you want, and get a photorealistic redesign in seconds—not a cartoonish render that ignores your windows.

The difference between a redesign that looks real and one that looks like a video game comes down to the prompt. Vague prompts get you generic stock-photo rooms. Specific prompts get you your room, restyled.

Below are copy-and-paste templates for bedrooms, kitchens, and living rooms, plus the workflow that keeps the results grounded in reality.

For a broader toolkit, see our complete Nano Banana interior design guide.

Why Nano Banana Beats Traditional 3D Renders for Room Design

Nano Banana is Google’s nickname for its Gemini 2.5 Flash Image model, with a newer, higher-resolution version called Nano Banana Pro built on Gemini 3 Pro Image.

For interior work, its edge over classic render engines is simple: the output looks like a photograph, not CGI.

That matters when you’re showing a client—or your partner—what a space could become.

What Makes Nano Banana Useful for Room Design?

Three things make it genuinely useful for rooms:

• It understands space, not just pixels. Nano Banana Pro reads geometry and layout, so it can swap materials, furniture, and lighting while keeping walls, windows, and doors where they belong.
• It edits conversationally. You can change one thing at a time—walls, then furniture, then lighting—instead of regenerating from scratch and losing the parts you liked.
• It is free to start. You can use it in the Gemini app or Google AI Studio without a subscription.

New to the tool? Start with our beginner’s guide to Nano Banana, then return to the templates below.

Designer AI adoption jumped from 9% in 2023 to 29% in 2025, with practitioners reporting up to 60% productivity gains, according to industry estimates from First Chair.

The global interior design market is projected at $153.85 billion in 2026, according to Instant Interior AI’s 2026 report.

The Four-Part Prompt Formula That Actually Works

Before using the room templates, learn the basic prompt structure.

Every strong Nano Banana room prompt has four parts:

Skip any of these and the model fills the gap with a guess.

Include all four and you get a redesign that respects your actual room.

Basic Nano Banana Room Prompt Structure

Using the uploaded photo, preserve the existing windows, doors, and room layout. Redesign the room in a [named style]. Add [materials, furniture, colours, and lighting]. Photorealistic, natural daylight, eye-level camera.

Bedroom Design Templates

Bedrooms are usually the easiest place to start because the layout is simple and the mood is everything.

Upload a clear room photo, then adapt one of the templates below.

The trick with bedroom redesigns is to change the palette and lighting last. Lock the furniture layout first, confirm that you like it, and then adjust the mood.

Scandinavian Calm

Using the uploaded photo, redesign this bedroom in a Scandinavian style. Keep the window and bed position. Add a light oak bed frame, white linen bedding, a woven jute rug, and warm 2700K lighting. Photorealistic, natural daylight.

Why This Prompt Works

The prompt preserves the main room layout while giving the model clear instructions about:

• Furniture material
• Bedding style
• Rug texture
• Lighting temperature
• Photography style

Moody Mid-Century

Redesign this bedroom in a mid-century modern style. Preserve the room layout. Add walnut furniture, a deep teal accent wall, a mustard armchair, globe pendant lighting, and a low platform bed. Photorealistic, soft evening light.

Best Use Case

This prompt works well for bedrooms that already have:

• Dark flooring
• Large windows
• Warm wood details
• Enough room for an accent chair

Japandi Minimalism

Transform this bedroom into a Japandi style. Keep the bed and window positions. Add low-profile wood furniture, a greige and off-white palette, paper lantern lighting, and minimal decor. Photorealistic, soft diffused daylight.

Optional Japandi Prompt Addition

To make the result feel more natural and less like a showroom, add:

Include subtle natural textures, handmade ceramic decor, and slight fabric imperfections.

Kitchen Design Templates

Kitchens are harder because they contain fixed elements, including:

• The sink
• The kitchen island
• Plumbing
• Appliances
• Windows
• Cabinet runs

Always tell Nano Banana what must remain unchanged.

When the model moves your island or invents a second window, add the following line to your prompt:

Do not move or add any windows, doors, plumbing fixtures, appliances, or the kitchen island.

Then regenerate the image.

Modern Industrial Kitchen

Redesign this kitchen in a modern industrial style. Keep the existing layout and island position. Add matte black cabinets, concrete-look countertops, an exposed brick accent wall, and brass pendant lights. Realistic photo, eye-level camera.

Important Preservation Instruction

For a realistic result, you can expand the prompt with:

Preserve the existing sink, windows, doors, island dimensions, appliance positions, and ceiling height.

Bright Modern Farmhouse Kitchen

Restyle this kitchen as a modern farmhouse. Preserve the cabinet layout and window. Add shaker cabinets in sage green, butcher-block countertops, a white subway-tile backsplash, matte black hardware, and a large apron sink. Photorealistic, bright natural light.

Optional Colour Control

When you need a specific cabinet colour, include a hex code:

Use sage green cabinets in approximately #A8B5A2.

Adding a colour reference helps prevent the model from generating cabinets that are too dark, too grey, or too saturated.

Sleek European Minimal Kitchen

Redesign this kitchen in a handleless European minimal style. Keep the island and appliance positions. Add matte white flat-panel cabinets, a quartz waterfall island, integrated appliances, and warm under-cabinet lighting. Photorealistic, soft even lighting.

For a More Premium Result

Add the following details:

Use seamless cabinetry, minimal visible hardware, thin countertop edges, concealed storage, and clean architectural lines.

Living Room Design Template

Living rooms reward specificity about furniture arrangement because layout is what makes a space feel livable rather than staged.

Tell the model:

• What furniture must stay
• Where the sofa should remain
• Whether the TV wall can change
• Which windows and doors must be preserved
• How much decor should be added

Japandi Warmth

Transform this living room into a Japandi style. Preserve the sofa placement and windows. Add low-profile furniture, a neutral beige and greige palette, light wood, minimal decor, and soft diffused lighting. Photorealistic.

Optional Layout Instruction

Keep clear walking space between the sofa, coffee table, doorway, and windows.

This helps the result feel practical rather than purely decorative.

Bohemian Eclectic

Redesign this living room in a bohemian eclectic style. Keep the sofa and rug positions. Add layered textiles, rattan accents, hanging plants, warm terracotta and cream tones, and mixed vintage furniture. Photorealistic, warm afternoon light.

Avoiding an Overcrowded Result

Bohemian prompts can quickly become too busy. Add:

Keep the styling curated and balanced. Do not overcrowd the walls, floor, or furniture surfaces.

Contemporary Luxe

Restyle this living room as contemporary luxe. Preserve the layout. Add a curved cream bouclé sofa, a marble coffee table, brushed-brass floor lamps, a large abstract art piece, and layered warm lighting. Photorealistic, editorial lighting.

Optional Luxury Details

You can also include:

Add full-height curtains, subtle stone textures, soft neutral fabrics, and discreet architectural lighting.

The Before-and-After Workflow

Here is the five-step sequence that keeps your results realistic rather than turning them into fantasy rooms.

The final step—locking the winning design as a style reference—is how you scale from one room to an entire home.

Because Nano Banana keeps characters and objects consistent across edits, you can feed a finished living room back into the model as a style reference so that your bedroom and kitchen match.

A Practical Step-by-Step Example

Suppose you want to redesign your bedroom.

Step 1: Preserve the Layout

Start with:

Using the uploaded bedroom photo, preserve the room dimensions, window position, door position, and bed placement.

Step 2: Apply the Style

Then add:

Restyle the bedroom in a warm Scandinavian style using light oak, white linen, soft beige walls, and minimal decor.

Step 3: Refine the Furniture

After the first result, write:

Keep the current design, but replace the bedside tables with floating light-oak nightstands. Do not change anything else.

Step 4: Adjust the Lighting

Next, write:

Keep everything unchanged. Replace the ceiling light with a simple paper pendant and add warm 2700K bedside lighting.

Step 5: Finalise the Mood

Finish with:

Keep the room layout, furniture, and lighting unchanged. Make the natural daylight slightly softer and add subtle linen and wood textures for realism.

This staged approach gives you more control than asking the model to redesign the entire room in a single pass.

How to Keep the Redesign Realistic

Use a Straight-On Photo

Photograph the room from a natural eye-level position.

Avoid:

• Extreme wide-angle lenses
• Heavy portrait-mode blur
• Crooked camera angles
• Very dark images
• Photos with people blocking the furniture

Describe What Must Stay

The more fixed features you identify, the more accurately Nano Banana can preserve the room.

Include instructions such as:

Keep the ceiling height, floor plan, doors, windows, and structural walls unchanged.

Change One Element at a Time

Instead of asking for new flooring, furniture, lighting, wall colours, decor, and windows in one request, make smaller edits.

For example:

1. Change the wall colour.
2. Replace the bed frame.
3. Update the lighting.
4. Add the rug.
5. Refine the decor.

This makes it easier to preserve successful parts of the design.

Include a Realism Cue

Useful realism phrases include:

• Photorealistic interior photography
• Natural daylight
• Realistic material textures
• Eye-level camera
• Soft diffused lighting
• Accurate room proportions
• Editorial interior photography
• Realistic shadows and reflections

Common Nano Banana Room Design Mistakes

Using a Vague Prompt

A prompt such as:

Make this room look better.

does not give the model enough direction.

A stronger version is:

Redesign this bedroom in a warm Scandinavian style. Preserve the bed, window, and door positions. Add light-oak furniture, white linen bedding, a beige wool rug, and warm bedside lighting. Photorealistic, natural morning light.

Combining Too Many Styles

Avoid prompts such as:

Make it Scandinavian, industrial, luxury, rustic, modern, and bohemian.

Choose one dominant style and, when needed, add one secondary influence.

For example:

Scandinavian style with subtle mid-century furniture details.

Forgetting Fixed Features

When you do not mention windows, doors, appliances, or plumbing, the model may move or replace them.

Always include a preserve instruction.

Changing Everything in One Prompt

Large, complicated prompts can make it difficult to retain the parts you like.

Work in stages instead.

Ignoring Lighting Temperature

Lighting can completely change the mood of the result.

Use approximate temperatures such as:

Watch It in Action

When you would rather see the workflow than read it, this beginner tutorial walks through redesigning a room from a single photo:

▶ Watch: How to Use Nano Banana AI for Interior Design—Beginner Tutorial — approximately 12 minutes

Two more tutorials worth watching:

• 5 Insane Ways to Use Nano Banana for Architecture and Interior Design — approximately 15 minutes
• Nano Banana Pro Tutorial—4 Powerful Hacks — approximately 10 minutes

Frequently Asked Questions

Is Nano Banana Room Design Free?

Yes. You can redesign rooms in the Gemini app or Google AI Studio without paying.

Nano Banana Pro’s higher-resolution 2K and 4K outputs may use paid tiers or API credits, but the base model is free to try.

Can It Work From a Photo of My Actual Room?

Yes. That is the recommended method.

Uploading a real photo and adding an instruction such as “keep the windows and layout” produces far more accurate results than using a text-only prompt.

Will the Redesigned Image Look Fake?

Not when your prompt includes both a realism cue and a preserve instruction.

The most common cause of fake-looking output is a vague prompt. The model invents a generic room instead of restyling your actual space.

Are the Images Watermarked?

Yes. Every AI image carries a SynthID watermark, an invisible marker that identifies it as AI-generated.

It does not affect how the image looks.

You can learn more about image provenance in our Nano Banana SynthID and C2PA guide.

Which Interior Style Is Easiest to Get Right?

Scandinavian and Japandi styles are usually the easiest because they rely on:

• Clean layouts
• Neutral colour palettes
• Natural materials
• Minimal decoration
• Soft natural light

These are all elements the model handles reliably.

Can Nano Banana Redesign an Entire Home?

Yes, but it is better to work room by room.

Complete the first room, use the result as a style reference, and then apply the same materials, colour palette, furniture language, and lighting style to the remaining rooms.

Can I Use the Result as a Final Construction Plan?

The image should be treated as a visual concept, not a technical architectural drawing.

Confirm measurements, materials, electrical work, plumbing, structural changes, and building requirements with qualified professionals before construction.

Start With One Room Tonight

Pick the room that bothers you most, take one straight-on photo, and run the matching template above.

Change a single variable, then another.

Within ten minutes, you will have a photorealistic redesign you can actually build toward—and a reference image you can carry into the next room.