Best Render Farm for Architecture Render Time: How to Estimate Cloud Cost
Here’s the formula most architects need: Total session cost = (setup time + render time + download time) × $8.20/hour. Setup is typically 5–10 minutes (opening the app, loading the scene). Download is 2–5 minutes for rendered images. The variable is render time — and that depends entirely on your renderer and scene complexity. Quick reference: Enscape 4K still = 2–5 min ($0.30–0.70). Lumion 4K still = 8–15 min ($1.10–2.05). V-Ray GPU 4K still = 10–30 min ($1.40–4.10). A practical session — open scene, render 5 images, download — takes about 30–90 minutes total ($4.10–12.30) depending on your tool.
| Session Component | Enscape Session | Lumion Session | V-Ray GPU Session |
|---|---|---|---|
| Boot server + connect | 2 min | 2 min | 2 min |
| Open app + load scene | 3–5 min | 5–10 min | 5–8 min |
| Adjust views + settings | 5–10 min | 10–15 min | 10–20 min |
| Render 5 × 4K images | 10–25 min | 40–75 min | 50–150 min |
| Download + disconnect | 3–5 min | 3–5 min | 3–5 min |
| Total session | 25–45 min | 60–110 min | 70–185 min |
| Session cost | $3.40–6.15 | $8.20–15.00 | $9.55–25.30 |
The Biggest Mistake: Not Accounting for Non-Render Time
Most architects estimate cloud cost by multiplying render time per image × number of images. They forget about the minutes around the render: booting the server, opening the application, loading the scene, adjusting camera angles, tweaking materials, downloading finished images. These “overhead minutes” typically add 15–30 minutes per session — $2.05–4.10 that doesn’t appear in per-image calculations.
The fix is simple: think in sessions, not images. Plan your rendering work in batches. Opening iRender 5 times to render 1 image each time costs approximately $10–20 in overhead. Opening iRender once to render 5 images costs approximately $2–4 in overhead. Batch your rendering work into focused sessions of 1–3 hours to maximize the ratio of actual rendering to billable time.
How to Predict Your Render Time Before Paying for Cloud
The best prediction tool: your own local render time. If a V-Ray 4K interior takes 60 minutes on your RTX 3070, it will take approximately 30 minutes on iRender’s RTX 4090 (roughly 2× faster). If a Lumion exterior takes 45 minutes on your GTX 1070, expect approximately 12 minutes on the RTX 4090 (3.5× faster). This local-to-cloud ratio is remarkably consistent once you know your GPU’s relative performance.
For first-time users without local data, use these conservative estimates per 4K image: Enscape interior 2–3 min, Enscape exterior 4–6 min, Lumion interior 5–10 min, Lumion exterior 10–18 min, V-Ray interior 10–25 min, V-Ray exterior 20–45 min. Multiply by your image count, add 20 minutes of session overhead, and multiply by $8.20/60 to get your estimated session cost. You’ll be within 20–30% of actual cost — close enough for project budgeting.
See more: Estimate your cloud rendering cost → Estimate your cloud rendering cost → View pricing on iRender
Frequently Asked Questions
- How do I estimate cloud cost for a complete architecture project?
Typical project: 10 stills + 1 walkthrough + 3 panoramas. Enscape: approximately $5–12 total (45–90 min session). Lumion: approximately $12–25 (90–180 min). V-Ray GPU: approximately $15–40 (110–290 min). Add 10–15% buffer for unexpected re-renders and setup time. Most architects quote clients $50–150 for rendering as a line item — actual cloud cost is a fraction of the client fee.
2. Does scene complexity change render time significantly?
Yes — dramatically. A simple bedroom (1,000 objects, no caustics) renders 3–5× faster than a luxury bathroom (500 objects but dense glass, mirrors, water). Object count matters less than material complexity. Reflective surfaces, transparent glass, and water features add 40–80% render time. Vegetation-heavy exteriors take 30–50% longer than bare building renders. Always test one image first before committing to a batch.
3. Can I set a spending limit on iRender to avoid unexpected costs?
iRender uses a credit-based system — you pre-purchase credits and rendering deducts from your balance. When credits run out, the server stops. This functions as a natural spending cap. We recommend loading $20–30 in credits for your first test session. iRender also offers a Credit Back system (10–20% returned per session), effectively reducing the hourly rate from $8.20 to approximately $6.55–7.40. Your actual per-hour cost is lower than the listed rate.
Related post: Best Render Farm for RTX 4090 Architecture: GPU Benchmark for Arch-Viz
