Our Story and Our People

Master Build Services was the first in New Zealand to offer building Guarantees – and our products remain the clear market leader. 

We were set up more than 25 years ago as a wholly owned subsidiary of the Registered Master Builders Association and we continue to evolve. In 2018 we carried out a full review of all our products to update them for the current market. 

Our Guarantee has been developed in New Zealand, by New Zealanders for New Zealand homes. 

More than 140,000 properties have been protected by our Guarantee since we started out. More than 50,000 of our Guarantees are currently active in the market offering protection for more than $34 billion worth of property.

Master Build Services is committed to the highest levels of governance. We are fully audited annually by both Independent Actuaries and Independent Accountants. We have a very strong Board which includes Independent Directors, the Board has extensive experience and knowledge of both the construction and Insurance markets in NZ. We are backed by the Registered Master Builders Association who work with the Government and the sector to develop and uphold the highest possible building standards. Registered Master Builders set the standard for professionalism, and our Guarantee is a key part of that.

Build with confidence. Engage a Registered Master Builder and insist on a Master Build 10-Year Guarantee.

Our People

MBS Board

Chris Preston

Chris Preston, Chairman of the Master Build Services (MBS) Board, was appointed to the Board in 2005. Chris is currently the Chairman of the Licensed Building Practitioners Board, and was a Director and Chairman of BRANZ and Chairman of Life Time Design. Previously he was the CEO of the Registered Master Builders Association and acting CEO of BRANZ. 


He is an experienced adjudicator, arbitrator and mediator and is a member of the Arbitrators and Mediators Institute of NZ. A self-employed dispute resolution professional, his clients include homeowners, contractors and builders. Chris has a keen interest in the community having been on the local Community Board and Business Association. He holds a Post Graduate Diploma in dispute resolution from Massey University and a Bachelor of Commerce.

Ralph Stewart

Ralph Stewart was appointed to the MBS Board in 2015. Ralph has thirty years’ experience in New Zealand's financial services sector and is currently the Managing Director of Lifetime Retirement Income Limited. 


Formerly Ralph was the CEO of AXA New Zealand and ACC, and a General Manager at TOWER Insurance. He is Chair of the Police Health Care Plan Limited, a Director of the Police Welfare Fund Limited, Police Association Insurances Limited, Police Association Mortgages Limited, Lifetime Income Limited, Lifetime Asset Management, The Retirement Income Group Limited.

Formally Ralph was a Director of AMP Superannuation, National Mutual Corporate Superannuation, Spicers Portfolio Management Ltd and the Victoria University Faculty of Commerce Advisory Board.

Ralph has a Masters in Business Administration from Manchester University in England and a Diploma in Business Administration from Victoria University in Wellington. Ralph is married to Anita and has two teenage children, Sophie & Harrison.

Mike Fox

Mike Fox joined the MBS Board in 2006. He is the founding Director of Primesite Homes, Abode Homes and more recently Easybuild House Packs. Mike has held many industry leadership positions including terms as Chairman and President of the Registered Master Builders Association, Director of Building Research New Zealand, and as a founding member of the Construction Strategy Group.  


A Registered Master Builder for more than 30 years, Mike has been honoured with a life membership of both the Wellington Registered Master Builders Association and the Registered Master Builders Association in recognition for his services to the construction industry.

Anthony Leighs

Anthony Leighs was appointed to the MBS Board in 2011. He is a former Chairman of the Registered Master Builders Association Board and a former Deputy Chairman of the Building Research Advisory Council.

Anthony is the Founder and Managing Director of Leighs Construction which plays a major role in New Zealand’s commercial construction sector and in the Christchurch rebuild. He is a former member of the Government Building Advisory Panel and the Construction Strategy Group. In 2015, he received the Special Commendation Award at the Champion Canterbury Awards for his contribution to Canterbury and has been awarded a commendation at the EY Entrepreneur of the Year awards.

Senior Management

Scott Matthews

Scott Matthews is the MBS General Manager and has more than 20 years’ experience in the Financial Services industry. Scott spent the past 7 years with NZ member owned business The Co-operative Bank. Scott’s skills include Management, Financial Risk, Business Relationship Management, Risk Management, and Operations Management.

Scott joined MBS in 2017 and has been responsible for reviewing the MBS Guarantee to ensure it maintains its position as New Zealand’s benchmark construction guarantee product. Scott has a Higher National Diploma in Business Administration & Management from De Montford University.

Kirsty Forman

Kirsty Forman is the Operations Manager at MBS.  Kirsty joined MBS in 2012 and oversees and manages all claims and operational processing. Her focus is on customer care and service, she ensures MBS provide timely responses to all enquiries including advice on what cover is available.

Kirsty has 15 years’ experience in the financial sector including claims experience, customer service, product development, management and financial services roles at Kiwibank and the customer owned Co-operative Bank.