Calculating compensation for property damage
Where works carried out on one property damage another, should compensation be payable on the basis of reinstatement costs or diminution in value? The High Court tackled that issue recently in the case of Lea Valley Developments Limited v Derbyshire.
The owner of a house had obtained an award under the Party Wall etc. Act 1996 that authorised a building project, including excavation works. The award required the owner to make good any decorative or structural damage caused to a neighbouring property, a block of flats, or to make payment in lieu.
The works caused damage to the block that was agreed to be so serious that it was beyond economic repair. The costs of demolishing and rebuilding the block were estimated at between £1 million and £2 million.
However, the house owner said that the diminution in the block’s value arising from the damage was between £500,000 and £1 million. The owners of both properties sought declarations as to the correct basis on which compensation was payable.
The Court rejected the owner of the block’s arguments that, on a true reading of the Act and the terms of the party wall award, there was no issue to be tried and that damages had to be calculated on a reinstatement basis. However, it also refused to grant the owner of the house a declaration that, as a matter of common law, the diminution in value basis necessarily prevailed.
The issue of whether reinstatement or diminution in value represented the correct approach to the assessment of damages was highly fact sensitive and dependent on a wide range of factors. There was no rule of law that prohibited awards on either basis or that required one to prevail over the other. It was thus inappropriate to resolve the issue without hearing detailed factual evidence.
[edit] Find out more
[edit] Related articles on Designing Buildings Wiki
Featured articles and news
Embedding AI tools into architectural education
Beyond the render: LMU share how student led research is shaping the future of visualisation workflows.
Why document control still fails UK construction projects
A Chartered Quantity Surveyor explains what needs to change and how.
New planning reforms and Warm Homes Bill
Take centre stage at UK Construction Week London.
A brief run down of changes intentions from April in an onwards.
Reslating an ancient water mill
A rare opportunity to record, study and repair early vernacular roofs.
CIOB Apprentice of the Year 2025/26
Construction apprentice from Lincoln Mia Owen wins this years title.
Insulation solutions with less waste for a circular economy
Rob Firman, Technical and Specification Manager, Polyfoam XPS explains.
Recycled waste plastic in construction
Hierarchy, prevention to disposal, plastic types and approaches.
UK Net Zero Carbon Buildings Standard V1 published
Free-to-access technical standard to enable robust proof of a decarbonising built environment.
Prostate Cancer Awareness Month
Why talking about prostate cancer matters in construction.
The Architectural Technology podcast: Where it's AT
Catch up for free, subscribe and share with your network.
The Association of Consultant Architects recap
A reintroduction and recap of ACA President; Patrick Inglis' Autumn update.
The Home Energy Model and its wrappers
From SAP to HEM, EPC for MEES and FHS assessment wrappers.
Future Homes Standard Essentials launched
Future Homes Hub launches new campaign to help sector prepare for the implementation of new building standards.
Building Safety recap February, 2026
Our regular run-down of key building safety related events of the month.
Planning reform: draft NPPF and industry responses.
Last chance to comment on proposed changes to the NPPF.
A Regency palace of colour and sensation. Book review.






















