Sian Mirchandani KC > 4 New Square Chambers > London, England > Lawyer Profile

4 New Square Chambers
4 New Square

Living Wage


Siân Mirchandani QC has established a broad commercial practice encompassing construction/engineering, professional liability claims, insurance and disciplinary claims in court proceedings, arbitrations and adjudications.

Siân has a particular interest in disputes involving construction, IT, technical and scientific elements and this has led to a strong construction/engineering practice and wide ranging experience in regulatory and experimental product testing claims.

Prior to her successful first application for silk in 2018, Siân was recognised as a Leading Junior by the directories for Construction, Professional Negligence and Disciplinary.

In Legal 500, 2019 Siân is described by her clients as “an excellent advocate – tenacious and extremely detailed, identifying potential problems and arguments even before they arise” and “tremendously bright, has a tenacious eye for detail, and brings a new level of strategic thinking to the table”.

In Chambers & Partners, 2019, Siân has been commended for her approach to her cases: “She is very competent and thorough and hits the right points in the right places”, “extremely responsive wherever she is and whatever the time zone. She has a very reassuring demeanour that instils confidence all round”, “proactive, helpful” and “someone who prepares the case very well”.

Who’s Who Legal, 2019 says: “Siân Mirchandani QC is recognised for her superb professional negligence practice.

Winner of Chambers & Partners ‘Professional Negligence Junior of the Year‘ 2015. Previous directory comments from clients have included “My default senior junior” “She can cut through the complex very quickly and She’s very strong on complex matters.” and “She really gets into the detail and owns a case”. Clients have described Siân as having “a sharp mind and excellent attention to detail”, and reported that “she is excellent – very pleasant to deal with and extremely robust and effective for her clients.” and “a very effective, hard-working practitioner with an eye for detail and the ability to present a highly persuasive argument” and “The great thing about her is that on every occasion her advice is strong, firm and consistent, which allows us to get an excellent settlement.” and “Very bright, robust, dedicated and thorough”.

Siân has wide and considerable experience of professional liability claims, including claims against accountants and auditors, architects, building inspectors, engineers, financial services professionals, insolvency practitioners, insurance brokers and agents, lawyers (solicitors and barristers), surveyors and valuers, receivers, land management agents, farm management agents, estate agents, clinicians and veterinary surgeons. Siân is a TECBAR accredited adjudicator.

Siân also has considerable experience of professional disciplinary tribunals (particularly architects and building inspectors), arbitrations, adjudications and mediations. Having qualified from Cambridge University as a veterinary surgeon in 1992, Siân worked in academic and general practice as a veterinary surgeon before coming to the Bar and joining Chambers in 1998.


Called 1997, Inner Temple; Silk 2019


Working knowledge of French.


Siân is a member of the Professional Negligence Bar Association, the Society of Construction Law, COMBAR, TECBAR, the Chancery Bar Association and the London Common Law & Commercial Bar Association, BILA, PNLA. She is a Committee Member of the Technology and Construction Court Bar Association (TECBAR).


Olchfa Comprehensive School; Emmanuel College, Cambridge (1992 MA VetMB, MRCVS, Cert VA); City University, London (1996 Dip Law).


Yoga, fitness training, body boarding.

Lawyer Rankings

London Bar > Construction

(Leading Silks)Ranked: Tier 5

Siân Mirchandani KC4 New Square ‘Sian is a stellar advocate. She is highly articulate and tenacious, and is excellent in cross-examination. She is always very prepared and completely on top of the facts.’ 

London Bar > Professional disciplinary and regulatory law

(Leading Silks)Ranked: Tier 4

Siân Mirchandani KC4 New SquareSiân is always on top of the details of a case and is excellent in the way that she leads a team of lawyers and experts on a case. This means that time is used to the best effect, and that clients take a great deal of confidence from the advice that she gives.

London Bar > Professional negligence

(Leading Silks)Ranked: Tier 2

Siân Mirchandani KC4 New SquareExtremely hard working. Available 24/7 more por less. Very bright.Client friendly. Tribunal friendly.’