Sketch to Render

Sketch to Render AI That Understands Architecture

Upload a hand-drawn or digital sketch and get a photorealistic render back in under 30 seconds, with the walls and proportion staying exactly where you drew them. No 3D model needed.

Hand-drawn linework sketch of a twin-gabled timber cabin in a highland valley

Photorealistic render of the same twin-gabled timber cabin at dusk, with a loch and highland mountains behind

Trusted by leading architects and design schools

The Problem

A Sketch Alone Doesn't Sell the Vision

Concept sketches are how architects think — but clients, planning boards and contractors need to see the finished building before they'll commit to it.

Clients Can't Picture Linework

A rough elevation reads as unfinished to anyone who isn't trained to see through it, however clear the idea is in your head.

3D Modeling Every Option Is Too Slow

Building a full model just to test one material or massing option burns hours you don't have mid-design.

Generic AI Tools Don't Understand Buildings

General image generators reinterpret your sketch instead of preserving it: walls shift, proportions drift, rooflines disappear.

Iterating Takes Days, Not Seconds

Testing five material options the traditional way means five separate renders, each with its own turnaround.

Guide the Result in Plain English

Describe the materials, light and mood you want, like "warm oak beams, soft skylight", and refine conversationally instead of re-prompting from scratch.

Linework sketch of a vaulted timber kitchen and living space with skylights

Photorealistic render of the same vaulted timber kitchen, with a concrete island and mountain views through the windows

How to Turn a Sketch Into a Render With AI in 3 Steps

From linework to a client-ready visual in under a minute.

Step 1

Upload Your Sketch

Any hand-drawn linework, digital sketch, or CAD elevation, as a JPG or PNG.

Step 2

Describe the Look

Tell it the materials, lighting and setting in plain English, no prompt engineering required.

Step 3

Refine and Download

Adjust with conversational edits until it's ready, then download at full resolution.

From Napkin Sketch to Client-Ready Render in Seconds

This cabin started as a loose concept sketch, a few quick marker marks, not a finished drawing. No 3D model, no render farm — just a sketch and a description of the setting.

Loose red-marker concept sketch of a twin-gabled timber cabin — Sketch

Photorealistic render of the same timber cabin under an overcast sky — Render

Input Formats

What Kind of Sketch Can You Use?

Anything from a napkin sketch to clean CAD linework.

Hand-Drawn Sketch

Digital Linework

CAD Elevation

Interior Perspective

Exterior Massing

Concept Diagram

See the Transformation

The same concept, from a colored marker sketch to a finished render — right down to who'll actually be using the space.

Colored marker illustration of a timber cabin at dusk, with a family at an outdoor table

Photorealistic render of the same scene: a family having dinner outside the cabin at dusk

Then Animate the Finished Render

Send the same render through the animation step and it comes back as a short cinematic clip, camera pulling in from the wider landscape down to the building, ready for a client deck or a reel.

An aerial camera move descending from a wide highland landscape down to the twin-gabled timber cabin

One render, turned into a moving shot.

Practising Architects Already Work This Way

Fenestra is part of the daily workflow at studios turning early concepts into client-ready visuals.

Michelle Morrison
Designer · Urbane Homes

Bjørn Polzin
Head of Planning · apoprojekt

Frequently Asked Questions

What architects ask before switching a concept-sketch workflow to AI.

A photorealistic 2D image, or a short video once you animate it. Fenestra doesn't produce an editable 3D model; the render itself is the finished deliverable, ready for a client presentation or planning application.

Fenestra holds the proportions, structure and perspective from your sketch, then applies realistic materials, lighting and context on top of them.

Yes. Upload a sketch of a kitchen layout, living room perspective or any interior space and get back a photorealistic visualization with realistic materials and lighting.

Yes, a CAD elevation or exported screenshot works the same way as a hand sketch. If you're starting from a finished 3D model instead, we have dedicated workflows for that.

Plans start at $10/month for the Individual tier (~200 renders) and $35/month for Pro (~1,000 renders), with Studio and Team plans for larger practices. Annual billing saves 20%.

Anything from a rough napkin sketch to clean digital linework or a CAD elevation. Fenestra reads architectural intent at any of these levels of detail.

General-purpose image AI can turn a sketch into a picture, but it wasn't built with architecture in mind. Fenestra hand-curates the models behind each render specifically for architects and interior designers, so walls, rooflines and scale stay true to what you drew. It's used daily by practising architects at firms including Mikhail Riches, Morgan Architects and Shop Architects.

Yes. Describe them in plain English ("exposed concrete with warm oak flooring", "golden hour, late afternoon sun") or upload a reference image to guide the style.

Yes. Every paid plan includes a full commercial license, so renders can go into client presentations, planning applications, marketing and competition entries.

Yes, it's part of Fenestra's core feature set from Individual through Team.

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