How much does a warehouse roof in Windsor generate?

The model gives 901 kWh for every kWp installed here, so 500 kWp comes out at about 451,000 kWh a year before any shading losses. You need roughly 1,485 sqm of clear roof to fit it. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.

Does the grid around Windsor have capacity?

Scottish and Southern Electricity Networks is the distribution network operator for Berkshire. Anything above 3.68 kW per phase connects under G99, and the application sets the export limit. We submit it as part of the design.

Is planning permission needed for panels on a Windsor unit?

Usually permitted development covers it. We still put the question to Windsor and Maidenhead before design sign-off, and we tell you early if a full application is needed rather than discovering it late.

Has anyone near SL4 already done this?

The planning database records 6 solar schemes in this postcode district, 6 of them roof mounted. That matters less as proof that it works and more as evidence of how the local network has been treating export applications. Source: Renewable Energy Planning Database, Q1 2026.

Solar panels for warehouses in Windsor

Most of the industrial stock around Windsor carries a large, shallow-pitched roof that was never asked to do anything. The survey measures the roof, not the postcode: cladding profile, purlin centres, remaining sheet life and the load the frame can take.

901 kWh per kWp a year at this latitude, so a 500 kWp array models at about 451,000 kWh. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.

Book a roof survey in Windsor

Drawing Windsor unit

Roof 96 x 62 m

Array 500 kWp

Yield 451,000 kWh/yr

Scale 1:500 / Rev A / SL4

Illustrative layout for a unit of this size. Your own figures come from the roof survey.

Windsor / Berkshire

Home Counties distribution estate with solar arrays on several unit roofs — Industrial stock of the kind we survey across South East.

Distribution centre solar across Berkshire

What a roof in Windsor actually generates

Modelled irradiation at this latitude is 1157 kWh per square metre a year in the plane of a shallow-pitched roof, which works out at 901 kWh for every kWp installed (EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss). That sits within a few percent of the mean across the towns we cover, so the case rests on your consumption pattern rather than on the weather.

We survey across the SL postcode area, starting from SL4.

Windsor and Maidenhead is the planning authority for most sites here, and the built-up area holds a population of about 31,560, so the stock here runs to trade counters, light industrial terraces and the occasional larger shed (ONS Census 2021 built-up areas).

FIG. 1 What a Windsor roof makes, month by month

Jul produces 5.7 times what Dec does on the same roof. A 500 kWp array here models at about 451,000 kWh across the year, but it arrives unevenly, which is why we size against your summer daytime load and then look at whether storage is worth adding for the shoulder months.

Monthly figures as a table

Month	kWh per kWp	500 kWp array
Jan	25	12,500
Feb	38	19,000
Mar	72	36,000
Apr	103	51,500
May	120	60,000
Jun	124	62,000
Jul	125	62,500
Aug	106	53,000
Sep	83	41,500
Oct	52	26,000
Nov	31	15,500
Dec	22	11,000

Source: EU PVGIS v5.2

FIG. 2 Windsor against the rest of Berkshire

Thatcham910
Reading907
Maidenhead905
Newbury904
Slough903
Windsor901
Wokingham898
Bracknell891

Windsor ranks 6 of 8 towns we cover in Berkshire on modelled yield, against a national mean of 886 kWh per kWp. The county runs from 891 to 910, a spread of 19 kWh per kWp. Within Berkshire that difference is small enough to ignore: where the building sits is not what decides this scheme, your consumption pattern is.

Bars are zero based, so length is proportional to the figure. Where a county is flat, that is the finding: location is not the lever, consumption is. Source: EU PVGIS v5.2, modelled per town

Solar already consented near SL4

From the government's Renewable Energy Planning Database, Q1 2026. These are the schemes on record in this postcode district, which is a fair guide to how the local network has been treating export applications.

Scheme	Operator	Capacity	Mounting	Status
Russells Farm, Windsor Great Park - Solar panels	The Crown Estate	0.21 MW	Roof	Revised
Russells Farm, Windsor Great Park - Solar panels	The Crown Estate	0.21 MW	Roof	Awaiting Construction
Car Park Legoland Windsor Resort, Winkfield Road - PV solar photovoltaic	Legoland Windsor Park Limited	1.2 MW	Roof	Awaiting Construction
St Johns Beaumont School, Priest Hill - Solar Panels	St Johns Beaumont School	0.26 MW	Roof	Application Refused
Waitrose, King Edward Court - Solar Panel Array	UREF LP	0.41 MW	Roof	Awaiting Construction
The Windsor Boys School, Maidenhead Road - Solar Panels	Solar Options for Schools Limited	0.49 MW	Roof	Awaiting Construction

Grid connection through Scottish and Southern Electricity Networks

Scottish and Southern Electricity Networks is the network operator here, and their answer on export capacity shapes the design. Any commercial array above 3.68 kW per phase connects under G99 rather than G98, and the application fixes what you are allowed to push back onto the network. If the local network is tight, limiting export rarely breaks the case here: most of the generation is consumed on site while the building is working.

Across Berkshire the planning database records 83 solar schemes totalling 317 MW, of which 8 are operational (REPD Q1 2026).

Book the survey

Send us the postcode

Tell us where the unit is and roughly how big the roof is. We come back with what it can carry, what it would generate against your consumption, and the three ways to pay for it.

Lenzie Consulting Ltd arranges the survey and passes your details to our MCS-certified installation partner so they can quote.

Questions about solar in Windsor

How much does a warehouse roof in Windsor generate?: The model gives 901 kWh for every kWp installed here, so 500 kWp comes out at about 451,000 kWh a year before any shading losses. You need roughly 1,485 sqm of clear roof to fit it. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.
Does the grid around Windsor have capacity?: Scottish and Southern Electricity Networks is the distribution network operator for Berkshire. Anything above 3.68 kW per phase connects under G99, and the application sets the export limit. We submit it as part of the design.
Is planning permission needed for panels on a Windsor unit?: Usually permitted development covers it. We still put the question to Windsor and Maidenhead before design sign-off, and we tell you early if a full application is needed rather than discovering it late.
Has anyone near SL4 already done this?: The planning database records 6 solar schemes in this postcode district, 6 of them roof mounted. That matters less as proof that it works and more as evidence of how the local network has been treating export applications. Source: Renewable Energy Planning Database, Q1 2026.

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