| Exterior Rendering Portfolio | At least 5–10 relevant exterior projects showing different house styles, materials, landscaping, and lighting conditions. | A broad portfolio indicates experience beyond template-based images. | High-resolution samples, before-and-after revisions, and project descriptions. | Compare realism, material detail, proportions, vegetation, shadows, and overall consistency. |
| Architectural Accuracy | Dimensions, openings, rooflines, façade elements, and structural details should match the approved drawings. | Incorrect geometry can misrepresent the design and create approval or marketing problems. | Marked-up previews, model screenshots, and a documented checking process. | Use a checklist to verify façade dimensions, window placement, roof pitch, and site orientation. |
| Software and File Compatibility | Ability to work with common formats such as 3DS, FBX, OBJ, SKP, Revit, AutoCAD, TIFF, PNG, and JPEG. | Compatible files reduce conversion errors and speed up production. | A sample file workflow and confirmation of supported software versions. | Send a small test file before awarding the full project. |
| Image Resolution and Output | Web images commonly use approximately 2,000–4,000 pixels on the long edge; print requirements may need higher resolution. | Output specifications affect website quality, brochures, billboards, and large-format printing. | Technical specification sheet covering resolution, color mode, file format, and compression. | Confirm RGB or CMYK requirements and whether layered or editable files are included. |
| Material and Lighting Realism | Stone, brick, concrete, glass, metal, wood, water, and vegetation should show appropriate texture, reflection, scale, and weathering. | Realistic materials improve buyer perception and reduce misleading visual representation. | Close-up material samples and day, dusk, or night rendering examples. | Check whether lighting direction, reflections, shadows, and material scale are physically plausible. |
| Turnaround Time | A single standard exterior view often takes several working days; complex scenes and multiple views require more time. | A realistic schedule helps coordinate construction, sales, planning, and advertising activities. | Milestone schedule, review dates, and delivery commitments. | Avoid providers promising unusually short deadlines without defining scope and revision limits. |
| Revision Policy | The quotation should clearly state the included number of revision rounds and the cost of additional changes. | Clear revision terms prevent disputes when design details change. | Written quotation, revision definition, and approval procedure. | Prefer annotated review files and consolidated feedback instead of multiple untracked messages. |
| Communication and Time-Zone Support | Agreed response times, a designated project manager, and communication in clear written English. | Accurate communication is essential when exchanging drawings, references, and technical corrections internationally. | Communication workflow, contact details, and sample status reports. | Test communication quality during the quotation and sample stages. |
| Pricing Transparency | The price should identify modeling, texturing, rendering, post-production, revisions, source files, and urgent delivery charges. | A low headline price may exclude essential production or revision services. | Itemized quotation with currency, payment milestones, taxes, and additional-service rates. | Compare total project cost rather than only the cost per image. |
| Quality-Control Process | A documented review should cover geometry, camera composition, materials, lighting, image defects, and export settings. | Quality control reduces avoidable errors before client review. | Internal review checklist and sample quality-control comments. | Request a low-resolution draft before final high-resolution rendering. |
| Data Security and Confidentiality | The partner should accept confidentiality terms and define how project files are stored, shared, and deleted. | Architectural drawings may contain commercially sensitive or unpublished information. | Confidentiality agreement, access controls, and file-retention policy. | Do not send complete sensitive files until the working relationship and confidentiality terms are confirmed. |
| Copyright and Usage Rights | The agreement should state who owns the final images, source files, models, textures, and reuse rights. | Unclear rights can restrict advertising, website use, resale, or future editing. | Written intellectual-property clause and asset-delivery list. | Confirm whether third-party models, stock assets, or licensed textures are used. |
| Payment and Contract Terms | Use a written contract covering scope, milestones, acceptance criteria, payment schedule, cancellation, and dispute handling. | Written terms protect both parties and create a clear basis for project management. | Formal quotation, contract, invoice details, and secure payment instructions. | Use milestone-based payments linked to agreed deliverables. |
| Trial Project or Paid Test | A small, clearly scoped test can assess modeling accuracy, style matching, communication, and delivery speed. | A test provides more reliable evidence than portfolio images alone. | Test brief, acceptance criteria, and agreed ownership of the test output. | Evaluate both visual quality and the partner’s response to corrections. |