What the Party Wall Act requires
The Party Wall etc. Act 1996 requires you to notify your neighbours (adjoining owners) before carrying out certain types of work to or near a shared wall. There are three types of notice: a Party Structure Notice (for work directly on a shared wall — e.g. inserting structural steels, cutting in pad-stones), a Line of Junction Notice (for building a new wall up to or on the boundary), and a Three Metre Notice or Six Metre Notice (for excavations within 3m or 6m of a neighbour's structure). For loft conversions, you almost always need a Party Structure Notice because the structural work — inserting ridge beams, floor beams and dormer pad-stones — affects the party wall.
The party wall notice and agreement process
The process has three outcomes. If the notified neighbour consents in writing within 14 days, no formal surveyor appointment is needed — you can proceed (though a schedule of condition is still advisable). If they dissent (object), or fail to respond within 14 days, a dispute is deemed to have arisen and each owner must appoint a party wall surveyor — either the same 'agreed surveyor' or separate surveyors who then appoint a third surveyor to adjudicate. The surveyors prepare a Party Wall Award (agreement) that records the pre-construction condition of the neighbour's property, sets out working hours, approved methods and protective measures, and provides a dispute resolution mechanism. The building owner (you) typically pays both surveyors' fees. Fees range from £700–£1,500 per surveyor for a standard loft conversion; complex cases or combative neighbours run higher.
How long does a party wall agreement take?
The Party Wall Act requires a minimum two-month gap between serving a Party Structure Notice and starting structural work near the party wall. In practice: you serve notice as soon as possible after planning or PD is confirmed (4–8 weeks into the pre-construction phase), the 14-day response period runs, and if an agreement is needed the surveyors are appointed and the Award prepared (typically 3–6 weeks). Well-managed projects have the party wall agreement signed before scaffold goes up. Where neighbours are hostile or repeatedly delay responses, the Act provides mechanisms to proceed regardless — a deemed dispute at 14 days, surveyor appointment immediately, Award preparation without the neighbour's cooperation.
