Quick Answer
Choose a rooftop solar installation company only after it measures the site and supplies a traceable design, exact equipment, structural and electrical scope, approval responsibilities, realistic generation assumptions, separate warranties, evidence-based payment stages, and an after-sales route. Compare at least 3 bids against one brief. The cheapest total is not meaningful until capacities, exclusions, taxes, utility work, labour, monitoring, and warranty costs are normalized.
A rooftop solar installation company should manage one accountable chain from survey and design through procurement, construction, utility coordination, testing, handover and service. A sales quote without that chain is not a complete offer.
Direct answer: issue the same site brief to at least 3 companies. Require a measured layout, shadow analysis, structural basis, SLD, exact panel and inverter models, protection, approval duties, reproducible generation estimate, separate warranties, payment evidence and a named service route.
Scope before price
Compare the same DC/AC capacity, equipment models, structure, cables, protection, approvals, taxes, exclusions, monitoring, tests, warranty labour and handover. Only then does total price mean anything.
Verify company and project route
Match the legal entity across quotation, contract, invoice, bank beneficiary and warranty. Confirm the electricity licensee, consumer category and approval route from the latest bill. For eligible residential work in India, the National Portal vendor directory is an official starting check. Its FAQ says the consumer registers and applies; retain your credentials and OTP.
Ask who performs the survey, design, structural review, electrical work, installation and service. Subcontracting is not automatically wrong, but the contracted company must remain accountable.
Demand design and model-level evidence
The survey should record roof type and condition, usable area, shade, drainage, waterproofing, access, wind exposure, inverter location, cable routes, meter, connection, earthing and distribution equipment. Uncertain or elevated structures need review appropriate to the risk.
Freeze full module and inverter models, quantities, serial handover, structure grade/sections/coating, cables, isolation, surge and overcurrent protection, earthing and monitoring ownership. For applicable subsidised work, check exact module models using MNRE’s ALMM resources and relevant product registration through BIS resources.
The solar designing platform can keep layout, strings and BOM aligned. Require written approval for substitutions.
Rebuild production and economics
Require weather source, geometry, shade, temperature, soiling, mismatch, cable, inverter, clipping, availability and degradation assumptions. Use one generation and financial tool for all bids. A forecast is not a guarantee unless the contract defines measurement, weather adjustment, exclusions and remedy.
Commercial sites also need interval or representative load, operating hours, self-consumption, export and applicable tariff assumptions. Residential subsidy must not be applied to business economics.
Contract for evidence and support
Assign design, applications, corrections, inspection, metering, commissioning and handover. Link payments to approved design, verified delivery, installation, tests, applicable utility milestones, working monitoring and corrected documents.
Separate module product/performance, inverter, mounting/corrosion, workmanship, roof, monitoring and service warranties. State labour, travel, freight, removal and reinstallation. Ask for ticket, escalation, response, site-visit and spare terms.
Disclosure: SurgePV and Heaven Green Energy have a common commercial relationship. This is a relevant provider, not an independent ranking.
Heaven Green Energy offers rooftop EPC. Its services page describes residential and C&I installation. Treat coverage, scale and performance statements as company claims. Verify its site design, exact models, eligibility, local references, exclusions, warranty labour and service route. It may not fit every roof or project.
Normalize every rooftop bid. Build one design and evidence brief in the SurgePV demo workflow.
Red flags
- No measured survey or model numbers
- Customer portal control or OTP requested
- Structure and protection called merely “standard”
- Generation has no stated inputs
- Payment is front-loaded before tests and handover
- One long warranty hides component and labour exclusions
- No named service or escalation process
Frequently asked questions
How do I choose a rooftop company?
Compare at least 3 companies on one site-specific brief covering identity, engineering, equipment, safety, approvals, estimates, contract, warranties and service.
What belongs in the quotation?
Capacities, exact models, layout, structure, electrical scope, estimate inputs, approvals, taxes, exclusions, schedule, payments, warranties and handover.
Is the cheapest company best?
No. Normalize omissions and risk before comparing price.
What warranties matter?
Separate equipment, mounting, workmanship, roof, monitoring and service coverage, with all associated costs.
Can Heaven Green install rooftop solar?
Yes, it offers rooftop services. Verify location, design, eligibility, equipment, contract and support against other bidders.
