Team Members

Marianne Barker

Marianne Barker


Marianne joined Asserson in 2013, having previously worked at leading City firms Ashurst and Linklaters. She was made a partner in 2016.

Marianne specialises in advising private clients in relation to planning and infrastructure matters. She is experienced in the drafting and negotiation of complex planning and infrastructure agreements for major residential and commercial led schemes, together with leading on planning due diligence for property acquisitions. Marianne has advised and led on public inquiries, both at appeal and in respect of development plans, and project manages major planning application schemes.

Marianne also works as a professional support consultant to Practical Law (Thomson Reuters), providing legal know-how to their client base.

Marianne studied in Bristol (University of West of England) where she was awarded joint honours in European Law, French and Spanish.

Marianne is married with two children and enjoys mountain biking and running.

Examples of recent work

  • Advising on the emerging policy framework of the new Old Oak and Park Royal Mayoral Development Corporation, and on a detailed application for a landmark group of buildings on Scrubs Lane, including a 22-storey tower adjacent to St Mary’s Cemetery, including the negotiation of a complex section 106 agreement involving the provision of affordable housing and a viability review mechanism.
  • Advising on a detailed application for a series of buildings between 8 and 19 storeys which will provide 200 private rented apartments. The negotiation of the section 106 agreement is now underway.
  • Part of the legal team who advised ABP on the new development at the Royal Albert Dock which will become London’s third business district and provide a unique trading link between Europe and Asia. The approved hybrid application (phase 1 and illustrative site wide masterplan) encompasses 4.7 million square feet of offices with supporting residential and retail units.
  • Advising PSP Warwick LLP, a joint venture between Warwick District Council and PSP Facilitating Limited, on a planning application on two linked sites owned by the Council, which will provide approximately 200 residential units in addition to new Council offices.
  • Instructed by the Winston Group to project manage a planning application for the redevelopment of Wallington Square Shopping Centre in the London Borough of Sutton. The scheme involves the creation of new modern shop units, the introduction of a new covered mall, significant public realm improvements and the construction of around 30 residential units.
  • Acted for Bank of Luxembourg on the redevelopment of a series of listed buildings in close proximity to London’s National Gallery. As well as advising on the legal powers of English Heritage, assistance was provided in putting together the client’s case for the substantial public benefits package from the scheme.
  • Advised on interpreting the affordable housing review mechanism contained in the s106 agreement for a 191 unit development on Stratford High Street. Including complex issues around the viability review.
  • Advised on a successful planning strategy for a site in Hampstead, which was the subject of a s215 notice and the start of CPO proceedings by Camden Council. Work included resisting the Council’s efforts to compulsorily purchase the site and managing a planning application for three large residential units and the negotiation of a s106 Agreement.
  • Led the planning due diligence exercise on a scheme for the redevelopment of an entertainment facility within the green belt
  • Project managed an application for the redevelopment of the built areas of a prestigious South-East golf club, to provide approximately 40 residential units. In addition to green belt, the application raises complex land use and social amenity issues.
  • Negotiated the planning terms of sale and purchase agreements for the Paradigm Group


  • In February 2016 the Estates Gazette published an article Marianne wrote which examined the Government’s Red Tape Review and the proposals for cutting unnecessary regulatory barriers to housing delivery.