White-label solar design is one of the least understood business models in India’s EPC sector — and one of the most useful. The concept is simple: an outsourcing firm does the engineering work, and you deliver it to your client under your own company’s name, letterhead, and branding. Your client never knows a third-party engineer was involved. Your sales pitch holds. Your brand reputation builds on the quality of the work, regardless of who produced it.
Direct answer. A white-label solar design service produces engineering deliverables — GA layouts, single-line diagrams, PVsyst reports, BOQs, structural calculations, CEIG drawings — with the client’s branding, letterhead, and engineer stamp rather than the design firm’s. The EPC or installer presents the work as their own. White-label models typically include confidentiality agreements that prohibit the design firm from disclosing the relationship. Pricing follows a per-project or volume-subscription model. The quality responsibility remains with the EPC — the design firm produces, the EPC reviews, certifies, and submits.
Most EPCs who use white-label design services do not talk about it publicly — that is the point. But the practice is standard across India’s C&I solar sector, across US residential installers, and across European EPC firms. This article explains how the model works mechanically, what contracts and QA processes look like, and which EPC profiles benefit most.
What “White-Label” Actually Means in Solar Design
White-labeling in solar engineering means the output is attributed to you, not to the firm that produced it. In practice, this means:
- Letterhead and branding: Every drawing, report, and BOQ carries your company’s logo, address, and contact details — not the design firm’s.
- Engineer attribution: The drawings may carry your firm’s name as the “designer” or “engineer.” If a PE stamp is involved, the PE may be your retained engineer rather than the design firm’s.
- File metadata: DWG files and PDF reports do not carry the design firm’s software registration name or author metadata. The file properties show your firm’s project reference.
- Confidentiality: The design firm is contractually prohibited from disclosing the relationship, listing your projects in their portfolio, or contacting your clients directly.
- Communication: All client communication goes through you. The design firm communicates only with your project team.
Definition. A white-label solar design service is an outsourced engineering production arrangement where the design firm's identity is removed from all deliverables and replaced with the client EPC's branding, creating the appearance of fully in-house design capability to the end client.
The Three Deliverable Categories in White-Label Solar Design
Not every deliverable type is equally suited to white-labeling. Understanding which categories work best helps EPCs decide what to outsource and what to retain.
Category 1: Technical drawings (highest white-label fit)
GA layouts, single-line diagrams (SLD), key plan drawings, elevation drawings, and civil layout drawings are pure technical artifacts. There is no “voice” or brand identity in a DWG file — the content is numerical and graphical. These are the easiest deliverables to white-label with no perceptible quality difference versus in-house production.
Category 2: Analysis reports (high white-label fit)
PVsyst yield simulation reports, shadow analysis reports, structural calculation reports, and BOQ spreadsheets are analytical documents. With your letterhead on the cover page and your firm’s project number in the footer, these read as your work to any reviewer. The underlying simulation inputs and methodology are invisible to a client who receives the PDF.
Category 3: Certification and approval documents (conditional fit)
CEIG approval drawings, DISCOM submission packages, AHJ permit packets, and PE-stamped sets require that a qualified professional certify the work. The white-label model works here only if your firm has the appropriate certification — a licensed electrical engineer or PE who can review and certify the outsourced design before submission. The design firm produces; your certifier reviews and stamps.
| Deliverable Type | White-Label Fit | Condition |
|---|---|---|
| GA Layout (DWG) | Excellent | None — replace letterhead, done |
| SLD / Electrical drawings | Excellent | None — replace letterhead, done |
| PVsyst simulation report | Excellent | Replace cover page, verify assumptions |
| BOQ spreadsheet | Excellent | Replace header, verify quantities |
| Structural calculation report | Good | Requires in-house PE review before certification |
| DISCOM submission package | Good | Requires your DISCOM registration credential |
| AHJ permit packet (USA) | Good | Requires PE stamp in the project state |
| CEIG drawings | Conditional | Requires your CEIG-registered engineer to certify |
How the White-Label Workflow Actually Operates
The operational mechanics of a white-label solar design relationship follow a defined sequence that most experienced EPCs run in under 48 hours from project intake to outsourcing brief.
Client Intake (Day 0)
You receive the project from your client — site survey, utility bill, load profile, equipment preferences. You produce a design brief from this information using your standard template. Your client sees your firm in complete control of the process.
Brief Transmission (Day 0–1)
You send the brief to the design firm via the client portal or a defined shared folder structure. The brief includes: project specifications, equipment schedule, site images/survey data, your letterhead template files (DWG title block, Word/PDF letterhead), and the DISCOM format reference if applicable.
Design Execution (Days 1–5)
The design firm produces the drawings and reports using your title block, your letterhead, and your project numbering system. All internal file metadata is cleaned. The designer at the outsourcing firm is identifiable only to you — your client never interacts with them.
Your Review (Day 4–5)
You or your senior engineer reviews the deliverables before client delivery. This review catches any specification mismatches or format issues. Standard review time for a rooftop project package is 30–60 minutes for an experienced reviewer. Revision requests go back to the design firm via the same channel.
Client Delivery (Day 5–7)
You deliver the completed package to your client under your firm's name. If the project requires CEIG or DISCOM submission, you or your registered engineer certifies and submits. Your client receives a professional deliverable that appears fully in-house.
The White-Label Contract — What Must Be in the Agreement
A white-label solar design arrangement requires a formal written agreement that protects both parties. The minimum contract elements:
NDA
Non-disclosure
Prohibits firm from disclosing relationship or client identity
IP
IP ownership clause
All deliverables are your property upon payment
SLA
Turnaround SLA
Defined delivery timelines and revision response times
NCE
Non-circumvention
Firm cannot approach your clients directly
The five must-have clauses in a white-label solar design MSA:
According to NREL’s 2024 Solar Workforce and Business Models Analysis, white-label subcontracting arrangements in solar are now standard practice across the US installer market — but fewer than 40% of firms use formal written MSAs, leaving significant IP and quality risk unmanaged.
-
Confidentiality and non-disclosure — The design firm cannot disclose the white-label relationship to any third party, cannot use your projects in their marketing portfolio without explicit consent, and cannot contact your clients directly.
-
Intellectual property assignment — Upon full payment, all rights to the delivered drawings, reports, and files transfer to your firm. The design firm retains no license to the work.
-
Non-circumvention — The design firm cannot approach your clients directly to offer design services for a defined period (typically 2–3 years post-termination of the agreement).
-
Branding compliance — The firm must use only your provided letterhead, title block, and branding materials. No internal firm identifiers (designer names, firm watermarks, software registration names) may appear in any client-facing document.
-
Revision and quality warranty — Defines the number of included revisions, the response time for revision delivery, and the process for resolving disagreements about design quality.
Watch out. A white-label arrangement does not protect you if the final deliverable is technically wrong and your client or DISCOM suffers consequences. Your firm's name is on the drawing — the legal and professional liability remains with you. This is why a quality review step before client delivery is non-negotiable, not optional.
Pricing Models for White-Label Solar Design
White-label solar design services use three common pricing structures. The right model depends on your project volume and the consistency of your pipeline.
| Pricing Model | Structure | Best For | Typical India Rates |
|---|---|---|---|
| Per-project flat fee | Fixed price per deliverable type (SLD, GA, PVsyst report) | EPCs with variable volume | ₹6,000–18,000 per rooftop project |
| Monthly retainer | Fixed fee for defined monthly volume (e.g., 10 projects/month) | EPCs with stable, predictable volume | ₹60,000–1,40,000/month for 8–15 projects |
| Volume tier | Discounted per-project rate as volume increases | EPCs scaling from 5 to 20+ projects/month | 15–25% discount at 15+ projects/month |
| Time-and-material | Per-hour billing for complex or irregular projects | Utility-scale or unusual project types | ₹1,200–2,200 per design engineer hour |
According to Bridge to India’s 2025 India Solar Market Report, the C&I segment now accounts for over 35% of India’s new solar installations, driving significant demand for white-label design capacity from EPCs who want to scale without proportional headcount growth.
The White-Label Brand Protection Framework
The concern most EPCs raise about white-label design is brand risk: “What if the outsourcing firm does poor work and it goes out under my name?” This concern is valid and addressable with the White-Label Brand Protection Framework — the four-layer quality architecture that separates EPCs that use white-label successfully from those that do not. Mercom India’s 2025 EPC market report found that EPCs with documented QA processes for outsourced deliverables reported 3× fewer client-facing design errors than EPCs with informal review procedures.
Layer 1: Vendor Qualification
Before committing to a white-label relationship, run a qualification project — a real project with a real brief, evaluated against a defined quality checklist. The qualification pass rate at Heaven Designs for new white-label clients is 100% by design: we do not proceed until the first pilot project meets the client's standard.
Layer 2: Brief Completeness
A complete brief reduces error rates by 70% compared to a partial brief. Use a standard template that captures equipment model numbers, DISCOM format reference, site dimensions, single-line basis, and any client-specific preferences. Ambiguous briefs produce drawings that require rework.
Layer 3: Your Internal Review
The deliverable goes through your internal review before reaching the client. This review is not the design check — that is the design firm's responsibility. It is the commercial check: does this match what the client asked for, does it meet the DISCOM format, and are there any obvious anomalies? This takes 30–60 minutes per project.
Layer 4: Defined Escalation Process
When a defect reaches the client despite your review, you need a defined escalation process with your design firm: how quickly they correct, who owns the client communication, and whether a credit or discount applies. A firm that does not have a defined escalation process is not ready for white-label relationships.
See what a white-label Heaven Designs package looks like
Download a sample rooftop design package — DISCOM-ready SLD, GA, BOQ, structural — with your letterhead replacing ours. Same quality, your brand.
Get the sample pack →Who Should Use White-Label Solar Design
The white-label model is most valuable for four specific EPC profiles:
Profile 1: The Scaling EPC (10–40 projects/month) You are growing faster than you can hire. Every new project brings new client expectations, and you need design capacity that scales with your sales pipeline without the lag of recruitment, onboarding, and training. White-label gives you the appearance of a large in-house design team while the actual team is variable and cost-elastic.
Profile 2: The Geographically Expanding EPC You are moving into new states — Maharashtra to Rajasthan, or Gujarat to Tamil Nadu — and each new DISCOM has different format requirements. An in-house designer who knows UGVCL format does not automatically know TANGEDCO format. A white-label partner with institutional DISCOM format knowledge across 15+ circles bridges the gap while you build geographic density.
Profile 3: The Specialty-Adding EPC You do rooftop well and want to add utility-scale or CEIG drawings without hiring specialists. White-label lets you offer these services to clients before you have built the in-house capability, with the intention of building it over time or keeping it permanently outsourced as a specialist service.
Profile 4: The US Installer Entering Multi-State Markets An installer strong in one state wants to expand. PE stamp coverage across multiple states without maintaining a multi-state PE bench is exactly what a white-label partner provides. According to SEIA’s 2026 industry data, installers operating across three or more states are the fastest-growing segment of the US residential market.
How Heaven Designs Helps
Heaven Designs operates a white-label design program for EPCs in India and installers in the USA. Our NDA is standard, our IP assignment is immediate upon payment, and our title-block replacement is included in every project at no additional cost. We have produced white-label deliverables for EPCs in 19 Indian states and across 14 US states.
- Solar Rooftop Detailed Engineering Design — Full IFC package: GA, SLD, BOQ, structural, DISCOM format-matched. White-label by default.
- Solar Permit Design — PE-stamped permit packets for US projects in 4–7 business days. Your client letterhead included.
- Electrical CEIG Drawings — CEIG-ready drawings for India projects requiring state electrical inspector clearance.
- Complete Guide to Solar Design Services in India — Full service catalog and deliverable specifications.
- Download a sample deliverable — Gated sample with your test letterhead applied.
Start a white-label conversation — we will confirm your DISCOM coverage, agree on the NDA, and run a pilot project within 5 business days.
FAQ
Is white-label solar design ethical?
Yes. White-label is a standard and legal sub-contracting model used across engineering, accounting, legal, and software industries. The EPC that delivers the work to the client is responsible for the quality and accuracy of the deliverables — the white-label model does not reduce that responsibility. What white-labeling does is outsource the production function while retaining the client relationship and quality accountability. It is equivalent to a law firm briefing junior counsel from another firm while presenting the work under the senior partner’s name.
Does the DISCOM or AHJ know that the design was outsourced?
No, and they do not need to. The DISCOM or AHJ evaluates the technical content of the drawing — whether it meets format requirements, whether the equipment is correctly specified, whether the single-line is accurate. The production origin is irrelevant to the approval authority. What matters is the certifying engineer’s credentials, which remain your firm’s (or your registered engineer’s) responsibility.
Can I get CEIG drawings through a white-label arrangement?
Yes, with a condition. The CEIG drawing itself can be produced by the outsourcing firm, with your letterhead and project details. However, the CEIG submission in most Indian states requires the drawing to be certified by a licensed electrical engineer registered with the relevant state authority. Your firm’s registered engineer must certify the drawing — the outsourcing firm cannot certify on your behalf unless they are also licensed in your state.
What happens if the client discovers the design was outsourced?
In most cases, this is a non-event — the client cares about quality, timing, and accuracy, not about whether the engineer sat in your office or in a design firm’s office 800 km away. If your contract includes a sub-contracting prohibition, you have a contract issue — which is why reviewing contract terms before outsourcing is essential (covered in when not to outsource solar design). For most standard EPC agreements, sub-contracting the engineering design function is permitted.
How long does a white-label title block change take?
A title block replacement in a DWG file takes 15–30 minutes per drawing set. This is typically done by the outsourcing firm as part of the design process — they work with your DWG title block template from the start. For PDF reports, a header and footer replacement in Word or InDesign takes 10–20 minutes. A professional white-label partner builds this into their standard workflow at no additional charge.
What is the minimum commitment for a white-label solar design arrangement?
At Heaven Designs, there is no minimum volume commitment for white-label design. We run single-project pilots for EPCs who want to test quality before committing to volume. After the pilot, most EPCs move to a monthly retainer or volume-tier arrangement based on their actual project cadence.
Are there white-label options for PVsyst simulation reports specifically?
Yes. A PVsyst simulation report can be delivered with your firm’s cover page, logo, project name, and footer. The simulation inputs, methodology, and results remain identical — only the branding changes. This is particularly valuable for EPCs who want to submit bankable PVsyst reports to lenders under their own firm’s engineering identity. See the bankable PVsyst reports guide for the full technical methodology.
