Solar PV Installation on North London Homes: A Practical Guide

Introduction

Solar photovoltaic (PV) panels convert sunlight into electricity, reducing electricity bills and a home's carbon footprint. In north London, solar PV is increasingly being installed on Victorian and Edwardian houses as part of wider sustainability improvements — typically combined with battery storage systems and heat pump installations to create a more self-sufficient, low-carbon energy system. This guide explains the practical considerations for solar PV on north London period properties, including the planning requirements that apply in conservation areas.

Solar PV Suitability in North London

Solar PV generates electricity from daylight — not just direct sunlight — and is productive throughout the year, including in the UK's less sunny northern latitude. Factors affecting the viability of solar PV on a north London house include:

• Roof orientation and pitch: South-facing roof slopes at 30–40 degrees provide the highest annual yield. East- or west-facing slopes provide approximately 80–85% of a south-facing installation. North-facing slopes are not suitable for solar PV.
• Shading: Trees, chimney stacks, and adjacent buildings can cast shadows that significantly reduce output. A shading analysis should be conducted before system sizing.
• Roof area: A standard domestic PV system requires approximately 15–25 sqm of unobstructed roof area. Victorian terraces typically have adequate rear roof area on a south-facing rear slope.
• Structural capacity: Solar panels add approximately 12–15 kg/sqm to the roof structure. Victorian roof structures generally have adequate capacity, but a structural check may be advisable for older properties with suspect roof timbers.

Planning Permission for Solar PV

Permitted Development (Non-Conservation Areas)

Solar PV panels on a dwelling are permitted development (no planning permission required) subject to conditions:

• Panels must not protrude more than 200mm from the roof slope when installed flush to the slope
• Panels on the principal elevation (the roof slope facing the street) are not permitted development where they would be visible from a public highway — many installers avoid front slopes for this reason
• Panels must not exceed the highest point of the existing roof

Conservation Areas and Listed Buildings

In conservation areas, solar panels are not permitted development if they would be visible from the highway. In practice, this means rear-slope installations are typically permissible as permitted development in conservation areas (if not visible from the street), but front-slope installations are not. For listed buildings, installation of solar panels requires listed building consent and is generally resisted where panels would be visible or would harm the historic character of the roof.

System Design and Sizing

A domestic solar PV system is sized by the installer based on the available roof area and the household's energy demand:

• A typical 4kWp (kilowatt peak) system on a south-facing roof in London generates approximately 3,400–3,800 kWh per year
• An average UK household consumes approximately 3,500 kWh per year in electricity (more with heat pump heating)
• Self-consumption (the proportion of solar generation used directly, without export to the grid) is typically 30–50% without battery storage, rising to 60–80% with a battery storage system

Smart Export Guarantee (SEG)

Electricity exported to the national grid from domestic solar PV installations attracts payment under the Smart Export Guarantee (SEG) — a rate set by energy suppliers, typically 3–15p per kWh exported. This provides income for surplus generation but at lower rates than the value of energy self-consumed. Battery storage maximises the value of solar generation by storing surplus for later use rather than exporting it at low rates.

Battery Storage

A home battery storage system (Tesla Powerwall, SolarEdge, GivEnergy, etc.) stores surplus solar generation during the day for use in the evening and morning. For a household with an ASHP or an EV charger, a battery system significantly increases self-consumption and reduces grid electricity purchase. See our home battery storage guide for more detail.

Costs and Payback

Conclusion

Solar PV is a practical and increasingly cost-effective energy improvement for north London Victorian and Edwardian houses with suitable south-facing rear roof slopes. The planning position in conservation areas is manageable for rear-slope installations. Combined with battery storage and heat pump systems, solar PV contributes to a substantially lower-carbon home energy system that reduces running costs and environmental impact over the long term. An architect managing a renovation or extension project will assess solar PV viability as part of the sustainability strategy for the project, co-ordinating roof design and orientation to maximise the potential for future solar installation if not immediately implemented.