A commercial roof is ready for solar only after its structure, condition, shading, electrical connection and daytime demand have been assessed. Compare installers on a documented scope and realistic generation assumptions.
Your building’s roof could help reduce its electricity bill. But before you compare panel brands or ask for an installation price, two questions deserve attention: is the building suitable, and can the provider deliver a system that performs as promised?
For owners considering commercial rooftop solar in Bangladesh, these questions belong together. A good roof can still end up with a poorly designed installation. An experienced installer may also recommend repairing the roof, choosing a smaller system, or improving electricity efficiency first.
This guide explains what to assess before investing, what a credible proposal should contain, and which questions help you choose a provider with confidence.
1. Is Your Commercial Roof Suitable for Solar Panels?
A large roof is a useful starting point, but its condition matters just as much as its area. Concrete roofs and metal-sheet roofs require different mounting details. Neither should be approved for solar simply because it looks solid during a quick visit.
Check structural strength and roof condition
Ask for a documented assessment by an appropriately qualified structural professional. It should consider the existing structure, the proposed mounting system, added loads, and wind exposure. Water leakage, corrosion, damaged roofing, or planned repairs should be addressed before installation.
The US Department of Energy’s commercial rooftop solar guidance highlights mounting and roof-warranty issues as central concerns for commercial owners. Its installation guidance also recommends evaluating structural strength, roof age, compatibility, and wind exposure. These are technical considerations, not substitutes for Bangladesh’s applicable requirements.
Measure usable space, not total roof area
Water tanks, stair enclosures, ventilation equipment, and shaded corners reduce the area available for panels. The layout must also preserve drainage, safe movement, and access for maintenance.
For example, a building with a large roof may have limited practical installation space if tanks and service equipment occupy its sunniest sections. A smaller, clearer roof could be easier to use effectively.
Ask for a marked roof layout showing panel positions, obstacles, access routes, and mounting details before accepting a capacity recommendation.
2. Does Your Electricity Use Match Solar Generation?
Roof suitability answers whether you can install solar. Your electricity consumption helps answer whether the proposed system makes financial sense.
Solar generates during daylight hours. A factory running daytime production, an office with daytime cooling demand, and a venue operating mainly at night will have different consumption patterns. They should not receive identical savings calculations simply because their roofs are similar.
Review bills and operating hours together
Prepare at least 12 months of electricity bills, together with information about:
- Opening hours and weekly closing days.
- Major daytime loads, including cooling, machinery, and pumps.
- Seasonal changes and planned business expansion.
- Existing generator operation and electricity interruptions.
- Available interval-meter data, where possible.
Bills reveal consumption and cost, but monthly totals alone do not show exactly when electricity is used. A stronger assessment compares expected solar generation with the building’s actual demand profile. The Department of Energy’s solar planning guide similarly recommends reviewing annual and seasonal electricity needs.
Consider two businesses with similar monthly bills. One runs throughout the day; the other uses most electricity after sunset. The first may consume more solar electricity directly, while the second depends more heavily on export arrangements or a different system design.
The right system size should follow your building’s demand, usable roof, and connection conditions. It should not be chosen only by fitting as many panels as possible.
3. Confirm Roof Rights, Net Metering, and Backup Needs
Before requesting a final quotation, establish who controls the roof and who holds the electricity account. These may be different parties in a rented factory, shopping complex, or multi-tenant commercial building.
If you lease the property, clarify written roof access, installation permission, maintenance access, and what happens when the tenancy ends. If tenants pay separate bills, ask whose account will receive the benefit and how costs and savings will be allocated.
Understand net metering in Bangladesh
Under Bangladesh’s net-metering framework, eligible consumers can use renewable electricity and export surplus under the applicable rules. Ask the provider and your utility to confirm current eligibility, equipment requirements, credits and settlement terms for your specific account, using SREDA’s published guidance.
The government’s net-metering application portal describes utility review, site inspection, evaluation, and agreement steps. Your proposal should identify who prepares documents, coordinates inspections, and pays connection-related costs.
Decide whether you need bill savings, backup, or both
Ordinary grid-connected solar does not automatically keep operating during a power cut. Anti-islanding protection disconnects it when the grid fails. Backup requires an appropriately designed system with suitable controls and, where needed, storage.
Tell the provider which loads must remain operational and for how long. Keeping essential computers running is a different requirement from powering an entire factory. Treat backup capability as a specified design requirement, not an assumed benefit of installing panels.
4. Check the Solar Provider’s Experience and Responsibilities
A polished quotation is useful, but it does not establish engineering competence. Ask who will survey the building, prepare the design, supervise installation, and take responsibility after commissioning.
Look for completed projects comparable to yours in roof type, electrical complexity, and operating conditions. A small installation on an uncomplicated roof does not, by itself, demonstrate experience delivering a large commercial project.
Ask for evidence you can verify
Request:
- Relevant business registration and applicable electrical licences or credentials.
- Names and responsibilities of the engineering and installation team.
- References from customers with similar projects.
- Sample commissioning records and handover documents.
- An explanation of how faults and warranty claims are handled.
Where customers permit it, visit an operating installation. Ask whether the final cost matched the quotation, whether any roof leaks occurred, and how quickly the provider responded to problems.
Make partner and subcontractor roles explicit
Some projects involve a property consultant, an engineering partner, and specialist installation crews. That can work well when accountability is clear. Ask who signs the contract, who approves the design, and who resolves defects.
The Department of Energy’s installer-selection guidance recommends clarifying subcontractor responsibilities and responsibility for roof damage or leaks.
Your contract should name the party responsible for each major deliverable. Avoid arrangements where the customer must discover after a problem that the salesperson, installer, and equipment supplier each consider it someone else’s responsibility.
5. Compare Commercial Solar Installation Quotes Properly
Two proposals with the same advertised capacity may include very different equipment, installation work, and support. Compare the complete scope before comparing the final price.
Ask every shortlisted provider to complete the same checklist:
| Item | What a clear proposal should state |
|---|---|
| System size | Panel capacity in kWp and inverter AC capacity |
| Equipment | Exact panel and inverter manufacturers, models, and quantities |
| Roof work | Mounting method, structural review, and waterproofing responsibilities |
| Electrical work | Cables, protection equipment, earthing, and connection scope |
| Generation forecast | Annual estimate, shading assumptions, and expected losses |
| Approval work | Applications, inspections, metering, fees, and responsible parties |
| Project price | Taxes, transport, installation, exclusions, and payment stages |
| Support | Monitoring, maintenance scope, warranties, and response commitments |
SREDA publishes net-metering equipment information and approved-equipment listings. Ask your provider to verify the exact proposed models against current applicable requirements. A recognised brand name alone is not enough to confirm eligibility.
Be careful with phrases such as “premium panels,” “complete installation,” or “all approvals included” unless the quotation defines them. Does the price include necessary electrical upgrades? Who repairs roof penetrations? Is monitoring access included?
A lower price is meaningful only when you understand what has been omitted. Ask providers to list exclusions separately and tie payments to defined deliverables, including testing and handover.
6. Test the Savings Forecast Before Accepting It
A credible proposal explains its calculations. It should distinguish expected generation, electricity used directly by your business, exported electricity, and ongoing costs.
Here is a simplified illustration, not a market quotation or a forecast for your building:
| Assumption | Illustrative value |
|---|---|
| Solar electricity generated and consumed on-site annually | 100,000 kWh |
| Avoided electricity energy charge | BDT 12 per kWh |
| Gross annual avoided energy cost | BDT 12 lakh |
That figure is not net profit. Maintenance, financing, applicable taxes, and replacement allowances affect the result. Fixed or demand-related utility charges may remain. Exported electricity should be calculated separately under the applicable settlement rules.
Ask the provider to show what happens if generation is lower than expected or your business operates fewer days. Also check whether a forecast assumes future electricity-price increases. A project that appears attractive only under optimistic assumptions needs closer examination.
Compare ownership with third-party investment
In a CAPEX arrangement, the customer owns and funds the system, potentially using finance. Under a RESCO or OPEX arrangement, a third party owns the system and sells electricity to the customer under a contract.
For third-party arrangements, review the electricity price, escalation clauses, contract duration, roof rights, and early-exit terms.
Request an annual cash-flow forecast with clearly stated assumptions rather than relying on a headline payback promise.
7. Plan Solar Maintenance and Handover Before Installation
The installation date is only one milestone. Before signing, establish how you will know the system is working properly and who will act when it is not.
The maintenance plan should address panel cleaning, inspections, monitoring, and fault response. Cleaning frequency should reflect site conditions rather than a generic promise. Dust exposure and safe roof access deserve attention during planning.
Separate the different warranties
A panel’s performance warranty is not the same as its product warranty. Neither automatically covers inverter failures, installation workmanship, roof leakage, or every expense associated with a claim.
Ask for the actual warranty documents and written answers about labour, transport, replacement arrangements, exclusions, and the local claims process. If a provider promises an annual generation guarantee, check its conditions and the remedy for underperformance.
Require a useful handover package
Before final acceptance, request:
- As-built layouts and electrical drawings.
- Equipment model numbers, serial numbers, and warranty documents.
- Commissioning and applicable electrical test records.
- Approval and metering documents relevant to the project.
- Monitoring access, operating instructions, and emergency shutdown guidance.
- Maintenance contacts and an agreed service schedule.
A system is easier to manage when its performance is visible and its responsibilities are documented. Clear handover records also help future facility managers understand the installation without relying on the person who originally arranged it.
Frequently Asked Questions
How do I know if my commercial building is suitable for rooftop solar?
Arrange a site assessment covering structural capacity, roof condition, shading, usable space, electrical infrastructure, and daytime electricity use. Roof ownership or permission also matters. A satellite image or roof measurement alone cannot establish suitability.
How much roof space is required for commercial solar panels?
There is no single reliable area requirement for every building. Panel dimensions, mounting layout, shading, access routes, and obstacles affect capacity. Ask for a site-specific layout showing usable installation area and the proposed system size.
Will commercial rooftop solar work during load shedding?
Ordinary grid-connected solar shuts down during grid failure through anti-islanding protection. If backup is required, ask for a system designed for specified essential loads, with suitable controls and storage where needed. Confirm its operating limits in writing.
What should I check before choosing a solar installation provider?
Verify comparable completed projects, the responsible engineering team, applicable credentials, exact equipment models, and a detailed installation scope. Compare savings assumptions, approval responsibilities, warranties, and maintenance support. Ask existing customers about performance and fault resolution.
Can a rented commercial building install rooftop solar?
It may be possible, subject to landlord permission, roof rights, utility requirements, and contractual arrangements. Clarify access, lease duration, responsibility for damage, and what happens to the system when the tenancy ends before committing.
Start With Your Building’s Actual Requirements
Before committing to commercial rooftop solar in Bangladesh, gather your electricity bills, roof photographs, property details, and operating schedule. These give an assessment team a practical starting point and help you compare proposals on the same basis.
Discuss your property and energy goals with AG. Share your building location, approximate roof area, monthly electricity bill, and whether your priority is lower bills, backup power, or both.
Related AG guides
- Solar Panels in Bangladesh: Costs and Trends for 2027
- Sustainable Building in Bangladesh: Materials and Design Choices
Contact AG to discuss your property, interior or building requirements.