Solar in Garden Town Lahore — installing on older roofs

What Garden Town actually is

Garden Town sits between Ferozepur Road on one side and the Wahdat-Iqbal Town corridor on the other. The named blocks, Aurangzeb Block, Atta Turk Block, Tariq Block, Ittefaq Town extension, are mostly old 10 marla and 1-kanal homes built between 1975 and 2000. There are a few smaller 5-marla streets on the outer edges, and some commercial pockets along Babar Block and the canal-side road. The defining feature for solar is the trees. Garden Town has some of the biggest residential trees in Lahore, and that has consequences.

Summer bills in Garden Town run wider than other middle-class neighbourhoods because the homes are bigger but the families are sometimes smaller. A 1-kanal house with two retired parents can have a PKR 40,000 bill, while the same plot size next door with a joint family of nine and seven ACs runs PKR 130,000. Sizing here is not done by plot size, it is done by the actual June bill.

The tree shading problem and the real fix

Walk down Aurangzeb Block at 4 pm in May. The afternoon sun comes in from the west, and many of the streets are lined with old shisham and ficus trees that throw shade across half the roof from 3 pm to 6 pm. That is exactly when the AC load is peak. The wrong answer is to ignore it and hope the panels still produce. The right answer is to do a shade study during the survey.

The survey engineer takes photos at 9 am, 1 pm, and 4 pm. The shaded panels in the late afternoon are then put on a separate string with module-level optimisers, or on a different MPPT input on the inverter. The cost adder is about PKR 10,000 to PKR 14,000 per optimised panel. On a typical 10 kW Garden Town install, 4 to 6 panels need optimisers. Budget PKR 50,000 to PKR 75,000 extra.

For homes where shade covers 30 percent or more of the roof for 3+ hours daily, a smaller system with a battery often makes more financial sense than a bigger system with heavy optimiser cost. A 7 kW with 10 kWh lithium can do what an unoptimised 12 kW with no battery would have done at the same price.

Older roofs — what to check

Houses built before 1995 in Garden Town often have a thinner main slab, sometimes only 5 inches of RCC, sometimes with iron bars that have started to corrode where the parapet meets the slab. Three things the survey engineer checks before quoting.

First, the slab thickness with a small core sample or a structural drawing from the original architect if available. Second, the parapet wall condition, if it is leaning or showing cracks, the mounting frame cannot bolt into it and a separate freestanding frame is needed. Third, any prior leakage points. A roof that has been patched with bitumen sheets needs the patch lifted before drilling for mounting anchors, otherwise the leak will come back the next monsoon.

The cost adder for structure strengthening on an older Garden Town roof is PKR 35,000 to PKR 80,000 depending on what is needed. Most homes do not need it. About 1 in 5 do.

Sizing for typical Garden Town homes

House	Summer bill (PKR)	System	Battery	Cost (PKR)
5 marla, older	22,000 – 35,000	5 kW on-grid	Optional 5 kWh	820,000 – 1,100,000
10 marla, 4 ACs	45,000 – 70,000	7.5 kW	Optional 5 kWh	1,150,000 – 1,500,000
10 marla, joint family	65,000 – 100,000	10 kW hybrid	5 to 10 kWh	1,700,000 – 2,100,000
1-kanal, light load	40,000 – 70,000	7.5 kW	Optional	1,200,000 – 1,400,000
1-kanal, heavy	110,000 – 160,000	12 to 15 kW hybrid	10 kWh	2,300,000 – 2,800,000

A real BoQ — 7.5 kW hybrid, Atta Turk Block, January 2026

Homeowner: a 10 marla single-storey house, summer bill PKR 62,000, four inverter ACs, family of six. Two trees throwing afternoon shade on the south-west roof corner.

Item	Detail	PKR
Panels	14 × 580W Longi bifacial	475,000
Inverter	8 kW Solis hybrid, NEPRA-approved	410,000
Battery	5 kWh Dyness lithium	235,000
Optimisers	4 × Tigo TS4-A-O on shaded panels	48,000
Mounting	Galvanised L2 + L3 + 1 freestanding frame	165,000
Cable, protection, SPDs	4 sqmm DC, 16 sqmm AC, 30 m runs	92,000
Net metering	LESCO paperwork, AGM coordination	40,000
Labour, commissioning	3-day install	85,000
Total		1,550,000

Bill after commissioning, June 2026: PKR 12,800 against a previous June of PKR 78,000. The battery covers the evening AC during the regular 7 pm to 9 pm load shedding window that still hits this part of Lahore on summer Tuesdays and Fridays.

Net metering — the Garden Town feeder

Garden Town addresses are served by the LESCO Garden Town Sub-Division near Babar Block. Net metering applications go through the standard online portal and the AGM Garden Town signs off after the site inspection. Timeline in 2026 is around 7 to 9 weeks. The feeder has been getting busy with new applications since 2023, so the queue can stretch by another 2 weeks during the November to January peak filing season.

One thing specific to Garden Town, many homes have the meter at the property line on a separate concrete pole, not on the wall of the house. The bi-directional meter has to be installed at the same location, and the wiring from the pole to the inverter sometimes needs a fresh run. Budget PKR 12,000 to PKR 20,000 for that cable run if it is over 25 m.

Access and install logistics

Garden Town's inner streets are narrow and tree-lined. Crane access for lifting panels onto a single-storey roof is usually fine because the roof height is low. For double-storey homes the crane truck often cannot park directly outside, and panels are lifted by rope-pulley through the staircase. That adds half a day. Two-day installs in this area often slip to three days.

Common service calls

Two issues come up more often in Garden Town than other neighbourhoods. The first is roof leakage at mounting points, especially on roofs that were waterproofed with cementitious coating before the install. The fix is to lift the affected mount, re-seal with butyl tape and EPDM gasket, and re-tighten. Cost: PKR 4,500 per mount. The second is bird droppings on south-facing panels. The tree canopy attracts more birds here than in DHA, and a panel with heavy bird droppings can lose 8 to 12 percent output. Adding a bird-deterrent strip along the panel edge costs PKR 1,200 per panel and lasts about 3 years.

Why a smaller system sometimes wins

The temptation in Garden Town is to put the biggest system the roof can hold. That logic works in DHA where the roof is open. Here, where shade is the limiting factor on at least one face of the roof, a properly sized smaller system with a small battery often beats a maxed-out unshaded estimate by 15 to 20 percent in real annual generation. The survey engineer's job is to be honest about that tradeoff.