National Grid Easements and Their Impact on Title
An easement is a right registered against a property's title that allows a third party to use that part of the land for a specific purpose. National Grid (or its predecessors) typically registered easements over land where pylons are sited or where overhead lines cross private land. These easements typically allow National Grid to erect and maintain pylons and cables, access the land for inspection and maintenance, and restrict certain activities within a specified distance of the pylon or line (such as the planting of tall trees, the construction of buildings, or the raising of the land level).
Where a National Grid easement affects your property, it will be noted in your title register at HM Land Registry. Your conveyancer can obtain copies of the easement documents to identify exactly what activities are restricted and over what area of the property. An easement over the garden or a corner of the plot is generally less problematic than one that affects the building itself or its immediate curtilage. Lenders take comfort from understanding the precise extent of the easement and whether it materially affects the property's use, value or future development potential.
Properties where a pylon actually stands within the garden or very close to the boundary are the most significantly affected by easement constraints, as the restrictions tend to be more extensive and the visual and practical impact more pronounced. Properties where only the overhead cables pass across or near the property (without a pylon on the land) are generally less affected, as the easement may be less restrictive and the visual impact is also typically lower.
Valuation Impact and Lender Attitudes
Research from the Royal Institution of Chartered Surveyors and various academic studies has found that proximity to pylons and high-voltage power lines can reduce residential property values. The extent of any reduction depends on the distance from the property to the pylon or line, the type of line (400kV transmission lines are the highest voltage and generally cause the greatest discount, while lower-voltage distribution lines may have minimal impact), and local housing market conditions. Studies have suggested discounts of between 2% and 10% for properties within 50 to 100 metres of high-voltage lines, with the greatest discounts for properties immediately adjacent.
Mortgage valuers will consider the proximity of pylons when assessing a property's value and may apply a downward adjustment to reflect the impact on marketability and comparable transactions. A reduced valuation directly affects the loan-to-value ratio a lender will consider, which in turn affects the amount you can borrow. Being aware of the likely valuation before making a remortgage application helps you plan your LTV requirement realistically.
Some mainstream lenders have blanket policies declining to lend on properties within specified distances of high-voltage transmission lines, typically 50 to 100 metres from a 400kV line. Others assess each case on its merits, taking into account the surveyor's valuation report and the specific circumstances. Specialist lenders are generally more flexible and can consider properties that fall outside mainstream lender criteria.
