Planning Viability

Development and Financial Viability Reports

Financial Viability Assessment

Viability can be used to inform the design of a proposed development at the plan making stage; alternatively a full Viability Assessment should be submitted with the planning application. 

Development sites and proposals are very site specific and are assessed on individual sites merits. Normally local planning authorities will usually appoint their own individual assessor at the application stage to review the submitted viability assessment and test the assumptions adopted. 

The proposed scheme will be valued on a Residual Land Value approach and compared to a Benchmark Land Value. The National Planning Policy Framework (NPPF) and Planning Practice Guidance (PPG) outline the most appropriate approach for assessing the Benchmark Land Value.

The most common method for determining the Benchmark is to assess the existing use value (EUV) of the site plus a suitable premium for the landowner. The price paid for land is not given much consideration in determining the Benchmark Land Value. 


The council's individual assessor will likely review the market evidence submitted to inform the Gross Development Value of the proposed scheme and either agree or disagree with the inputs. The assessor will not usually try to undermine deliverability or compromise sustainable development but advise the decision maker whether the scheme is providing the maximum reasonable level of affordable housing and / or planning obligations.

Roscoe Group - Providing Planning Viability Assessments and Advice

The Roscoe Group Chartered Surveyors is an independent firm based in London. A regulated member of the Royal Institute of Chartered Surveyors and Registered Valuer providing expert Development Consultancy and Agency services in London, Home Counties and the South East.

What our clients are saying about us.

  • “The Roscoe group provided us with affordable housing and Viability advice ahead of acquiring a site in South East England. Following an arduous planning process with lengthy viability negotiations handled by RG we successfully got consent and RG lined up a buyer of the affordable homes upon the grant of consent which de-risked the scheme for us and delivered much needed affordable housing in an efficient and effective manner.”

    Matthew Ahearn - Director - Canbury Homes

  • “We have used Roscoe Group on several occasions in connection with Valuation and Viability Advice. I have always found him to be thorough and knowledgeable. They are always prepared to take phone calls and respond to emails in a timely manner. Would happily recommend.’’

    Hugo Tobin - Wilton Trust Ltd

  • “Knowles has recently worked with Roscoe Group on multiple Land Acquisition and Viability negotiations, and throughout the partnership his experience and commitment to delivering was always evident, going over and above and ensuring our best interests were central. From the introduction, research, and overall approach, we couldn’t recommend them more highly and we look forward to continuing our relationship between Knowles & The Roscoe Group.”

    Megan Knowles - Director - Knowles Land

  • “Roscoe Group assisted me with my purchase, acting as my sole agent and advisor. They were always quick to respond to my enquires and provided me with very professional and reasoned advice. The Roscoe Group went above and beyond his initial scope of services and I couldn't recommend them highly enough.”

    Catriona Mcleod - Private Buyer