A GCB solar design should be sized to the usable roof and household electricity profile. The existing indicative installed-cost range is S$1,200 to S$2,000 per kWp; a site-specific quote determines cost. First-year benefit and simple payback depend on generation, on-site use, import prices and export-payment arrangements. Use the calculator for dated assumptions and an adjustable illustration. Rezeca has worked on Singapore GCB roofs since 2009.
A Good Class Bungalow gives you the roof area most homes never have, and that changes what solar can do for the property. Larger arrays offset the energy that GCBs draw for multi-zone air conditioning, pool filtration, lift systems and EV charging, and they do it while staying discreet against a roofline where street presentation matters.
Rezeca has installed solar on GCBs across Singapore's established enclaves since 2009, on tile, metal and reinforced concrete roofs. This page covers what a GCB system typically costs, how systems are sized, and the roof factors that shape the design.
Get a GCB roof assessmentGCB roofs typically support systems of 30 to 90 kWp, well above the size of a standard landed home. At the 2026 residential range of S$1,200 to S$2,000 per kWp, that puts most GCB installations in a wide band depending on roof area, roof type and panel choice. Larger systems usually sit toward the lower end of the per-kWp range because fixed costs spread across more panels.
For consistency with the calculator, a reference yield of 1,100 kWh/kWp a year gives a 66 kWp illustration of 72,600 kWh annually before site-specific adjustments. Actual generation requires a roof assessment. Solar used on site avoids purchases at your applicable import rate; exported solar earns a separate payment under the eligible scheme. Larger roof area does not by itself guarantee high self-consumption or a shorter payback.
Q4 2026 illustration: the SP regulated import tariff is S$0.3116/kWh including GST, effective 1 October to 31 December 2026. The calculator uses a rounded S$0.22/kWh SCT export illustration for eligible regulated-tariff customers. Retailer / ECIS customers must use their own contract import rate and applicable export assumptions. Simple payback excludes future operating costs, and tariffs change quarterly.
GCBs rarely offer one simple roof plane. Complex hip roofs, dormers, rooftop terraces, HVAC condenser banks and pool plant all break up the usable area, and shading from mature trees is common on large plots. Panels are distributed across multiple faces and levels, positioned to stay invisible from street level, and laid out to preserve terraces and outdoor living space. Full-black panels present as a single uniform plane rather than silver gridlines, which keeps a large array visually quiet against tile or metal.
Upper Bukit Timah, District 21: a 66.30 kWp tile-roof system on a GCB, using 130 full-black panels, generating around 82,000 kWh a year.
View the Bukit Timah GCB projectSwettenham Road, in the Nassim and Tanglin enclave: a 29.60 kWp standing-seam metal-roof system from 2022, engineered around a pool and tennis court.
View the Swettenham Road projectSwettenham Road: a 12.98 kWp system on a contemporary architect-designed home from 2018, placed in three clusters across split roof levels to preserve a rooftop terrace.
View the contemporary GCB projectLeedon Park: a 40.05 kWp tile-roof array, part of Rezeca's GCB work across Singapore's landed estates.
View the Leedon Park projectThese sit within more than 1,300 residential installations Rezeca has completed since 2009.
A site assessment and roof survey, a system design sized to your roof and consumption, handling of the SP and grid approvals, installation, and commissioning. Our guide below covers the paperwork we manage on your behalf.
How solar approvals work in SingaporeMost GCBs support systems in the 30 to 90 kWp range, depending on usable roof area, roof type and how much of the roof is taken up by terraces, plant and skylights. A site survey confirms the achievable size.
At the 2026 residential range of S$1,200 to S$2,000 per kWp, a GCB system spans a wide band because sizes vary so much. Larger systems tend toward the lower per-kWp figure. A site-specific quote is the only way to be precise.
On GCBs where presentation matters, panels are positioned to stay out of sight lines from street level, and full-black panels sit discreetly against tile or metal roofs.
There is no fixed GCB payback period. Divide the quoted installed cost by the estimated first-year benefit from avoided electricity purchases and export proceeds. Roof yield, shading, daytime consumption, electricity rates and system cost all affect the result. Use the calculator to adjust these assumptions, then request a site-specific assessment. Maintenance, degradation, replacements and financing also affect lifetime returns.
Yes. Rezeca has installed on multi-hip tile roofs, standing-seam metal, flat RC and fragmented contemporary rooftops, distributing panels across multiple faces and levels while preserving usable outdoor space.
Ask our team for a GCB roof assessment and a system estimate sized to your home.
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