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Solar panels for warehouses in Guildford

What makes a Guildford scheme work is rarely the panels. It is the condition of the roof underneath them. Each survey records the cladding profile, the usable area once rooflights and plant are removed, and the export limit worth applying for.

908 kWh per kWp a year at this latitude, so a 500 kWp array models at about 454,000 kWh. Source: EU PVGIS v5.2, SARAH3, 10 degree pitch, 14 percent system loss.

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96 m phase 1
Drawing Guildford unit
Roof 96 x 62 m
Array 500 kWp
Yield 454,000 kWh/yr
Scale 1:500 / Rev A / GU1

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

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

Logistics solar PV across Surrey

What a roof in Guildford actually generates

Modelled irradiation at this latitude is 1166 kWh per square metre a year in the plane of a shallow-pitched roof, which works out at 908 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.

Distribution stock around Guildford clusters on A3 and A31, which is where the large single-let roofs are.

Surveys run across GU postcodes, GU1 outward.

Guildford is the planning authority for most sites here, and the built-up area holds a population of about 77,880, 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 Guildford roof makes, month by month

What a Guildford roof makes, month by month

Modelled output per kWp installed, for a shallow-pitched south-facing array. Source: EU PVGIS v5.2.

050100Jan: 25 kWh per kWpJanFeb: 39 kWh per kWpFebMar: 73 kWh per kWpMarApr: 106 kWh per kWpAprMay: 120 kWh per kWpMayJun: 126 kWh per kWpJunJul: 127 kWh per kWpJul127 kWh Aug: 106 kWh per kWpAugSep: 83 kWh per kWpSepOct: 51 kWh per kWpOctNov: 30 kWh per kWpNovDec: 22 kWh per kWpDec

Jul produces 5.8 times what Dec does on the same roof. A 500 kWp array here models at about 454,000 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
MonthkWh per kWp500 kWp array
Jan2512,500
Feb3919,500
Mar7336,500
Apr10653,000
May12060,000
Jun12663,000
Jul12763,500
Aug10653,000
Sep8341,500
Oct5125,500
Nov3015,000
Dec2211,000
Source: EU PVGIS v5.2
FIG. 2 Guildford against the rest of Surrey
  • Redhill916
  • Dorking916
  • Leatherhead910
  • Guildford908
  • Woking905
  • Weybridge905
  • Farnham903
  • Staines903
  • Camberley900

Guildford ranks 4 of 10 towns we cover in Surrey on modelled yield, against a national mean of 886 kWh per kWp. The county runs from 900 to 916, a spread of 16 kWh per kWp. Within Surrey 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 GU1

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
Slyfield Industrial Estate, Slyfield - Solar PV System Mercedes Benz Of Guildford 0.15 MW Roof Revised
Slyfield Industrial Estate, Slyfield - Solar PV System Mercedes Benz Of Guildford 0.15 MW Roof Awaiting Construction

Grid connection through UK Power Networks

UK Power 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 Surrey the planning database records 74 solar schemes totalling 182 MW, of which 6 are operational (REPD Q1 2026).

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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.

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Questions about solar in Guildford

How much does a warehouse roof in Guildford generate?
The model gives 908 kWh for every kWp installed here, so 500 kWp comes out at about 454,000 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 Guildford have capacity?
UK Power Networks is the distribution network operator for Surrey. 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 Guildford unit?
Usually permitted development covers it. We still put the question to Guildford before design sign-off, and we tell you early if a full application is needed rather than discovering it late.
Has anyone near GU1 already done this?
The planning database records 2 solar schemes in this postcode district, 2 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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