Our Team


Our people are the strength of IGG Building Economy. It is they who provide the unique input that give your project the financial foundation. The IGG advisers put the customer first and determine the right approach independently.

Because IGG works in a team, you always get the knowledge and experience of the entire company when hiring an expert.

Abdullah Altintas

Construction cost consultant

More info

Abdullah Altintas

Construction cost consultant


Abdullah graduated from Delft University of Technology with a specialisation in Design & Construction Management. During and after his studies he worked at a consultancy firm and a project developer.

Abdullah has been working at IGG since 2016 as a construction cost consultant and is involved in the preparation and testing of construction cost estimates, the execution of feasibility studies and consulting the client regarding construction costs for complex construction projects. The design and realisation process is complex, full of risks and requires good management with insight. As a cost consultant, Abdullah finds it particularly interesting to steer these complex projects in an early phase with creative and integrated solutions that lead to better results within the project frameworks of time, money and quality.

Abdullah is very involved, thinks proactively and looks for integrated solutions to realize complex projects. For IGG, Abdullah has, among other thins, been involved with the renovation and expansion of Paleis Het Loo in Apeldoorn, Hanzehogeschool in Groningen and the University of Groningen. He has also worked on various residential and non-residential projects.

Ahmed Ahmed

Construction cost consultant

More info

Ahmed Ahmed

Construction cost consultant


Ahmed completed his Master's in Building Technology at Delft University of Technology in 2018 in the field of load-bearing construction, building construction and building physics. For his graduation project, he focused on the development of a sustainable, innovative, transparent facade for non-residential construction. After his studies he worked at a consulting engineering firm.

Ahmed has been working at IGG since 2019 as a construction cost consultant, where his responsibilities are focused on drafting feasibility studies, estimates and budgets based on analysing complex construction projects during various design phases. Due to the increasing complexity of construction projects, adequate construction cost advice is fundamental to guarantee financial feasibility. As a result, Ahmed uses its building technology knowledge and expertise to provide clients with an integrated perspective on construction costs.

Ahmed is very driven to bring complex building projects to positive results, with potential risks being identified in time. This includes a proactive approach, a healthy relationship between quality and construction budget, customer focus and involvement in various residential and non-residential projects. These are also his driving forces.

Aleyna Karabulut

Construction cost consultant

More info

Aleyna Karabulut

Construction cost consultant


Aleyna completed her Architecture degree in 2013 at the University of Applied Sciences Rotterdam. After completing her education, she started working at a small architectural firm in The Hague. She worked here for a year as an architectural drafter.

It soon became apparent that she wanted more control over construction costs and that is why she started as a junior calculator at a medium-sized construction company in Wateringen. She worked on various housing projects for three and a half years. In order to learn more about construction costs, she followed the course Construction costs at the HTI (Higher Technical Institute) in Amsterdam during her career with this contractor.

Aleyna has been working at IGG since 2019 as a construction cost consultant. She is involved in various residential and non-residential projects.

Arno Vonk MRICS

Director / Senior construction cost consultant

More info

Arno Vonk MRICS

Director / Senior construction cost consultant


Arno studied Architecture and his Masters in Management in The Built Environment at Delft University of Technology, where he graduated with honourable mention in 2003. Arno joined IGG in 2004 as a plan economist and since 2012 he has been the director / owner of IGG. He is involved in complex non-residential projects and area developments. The strength of his work lies both in the early phase of a development, in order to steer the project in the right financial direction, and in the later phase, when design optimisations are required within the desired quality and financial frameworks.

Arno has been involved in projects such as the expansion of the Amsterdam ArenA, Differ Eindhoven and Twenty4Amsterdam. He is also the founder of the BouwkostenKompas with the uitgaven Woning- en Utiliteitsbouw, GWW en Installaties.

Arno is very involved in the projects and always ensures that projects are realized within the set budgets while maintaining the aesthetic core qualities.

Awinash Baldew

Construction cost consultant

More info

Awinash Baldew

Construction cost consultant


Awinash started his study Architecture at the MTS in 2008 and continued this at the HTS in Rotterdam. During his HTS education, he worked part-time at a multidisciplinary engineering firm. Doing this, he came into contact with construction costs and maintenance & operation; he has not let go of this since. In order to learn more about construction costs, he attended the construction costs training course at the HTI (Higher Technical Institute) in Amsterdam after completing the HTS.

Since 2017, Awinash has been working as a construction cost consultant at IGG. In addition to his responsibilities such as making cost estimates, construction cost advice, scenario studies, second opinions, construction cost management, investment calculations and operation budgets, he is involved in a wide variety of complex projects.

Awinash advises on construction costs in all phases of a construction cycle. Together with the people involved, he always tries to find a way, otherwise he makes one.

Bart Klarenbeek

Construction cost consultant / Projectmanager

More info

Bart Klarenbeek

Construction cost consultant / Projectmanager


.

Bart-Jan Schets

Construction cost consultant

More info

Bart-Jan Schets

Construction cost consultant


Bart-Jan completed his Bachelor's degree in Building Engineering Business Administration in 2015 at the Avans University of Applied Sciences Tilburg. His joint graduation research focused on creating an improved tender process at Hurks Bouw's s-Hertogenbosch, where the search for the correct answer to the increasingly complex customer demand was central.

After his studies, he started his career at various employers both within and outside the construction sector to create as many insights as possible. These insights have led to a clear vision in which Bart-Jan wants to develop in the area of construction consultancy, where his interests and qualities can be fully appreciated. Since 2019, Bart-Jan has been working at IGG as a construction cost consultant.

In addition, Bart-Jan is driven by topics such as efficient, sustainable, circular, demountable, smart & data-driven building and working.

Belinda Lebbink

Consultant Bouwkosten

More info

Belinda Lebbink

Consultant Bouwkosten


Ben van der Hoeven

Construction cost consultant / Projectmanager

More info

Ben van der Hoeven

Construction cost consultant / Projectmanager


Ben has followed his study Architecture at the University of Applied Sciences Rotterdam. After that he completed his Master's degree in Real Estate Management and Development at the Eindhoven University of Technology in 2013 and in the meantime gained around 8 years of work experience with various developing contractors. Since 2017, Ben has been working at IGG as a construction cost consultant.

The practical experience and theoretical knowledge of Ben in both technical and economic terms form the basis for giving clients good advice. With this, he can be deployed in all areas that affect the construction costs. For IGG, Ben has been involved in various projects such as Tijdelijke Huisvesting Tweede Kamer in The Hague, construction cost management for all COA locations, the updating of land and real estate exploitation for the Municipality of Binnenmaas, building permit cost verification and Transformatie EuroPlaza in Amsterdam.

Bente Hof

Construction cost consultant

More info

Bente Hof

Construction cost consultant


Bianca Botha

Construction cost consultant

More info

Bianca Botha

Construction cost consultant


.

Chiara van der Veen

Tender and conctractmanagement

More info

Chiara van der Veen

Tender and conctractmanagement


Chiara has a Bachelor's degree in Real Estate Management from the University of Applied Sciences Rotterdam and subsequently studied Real Estate Studies at the University of Groningen. During her studies she has always been interested in innovative and leading construction projects.

Chiara has been working as a contracting and tender consultant since 2019 and is involved in various projects.

Cihan Sezer

Contruction cost consultant / Project manager

More info

Cihan Sezer

Contruction cost consultant / Project manager


.

Cor Guyt

MEP consultant

More info

Cor Guyt

MEP consultant


Cor has gained a lot of theoretical knowledge of MEP through attending technical education (LTS, MTS and HTS). The practical knowledge has been gained by working at several MEP companies and consulting firms.

His knowledge and experience of both the design and implementation of MEP ensure that he is a good sparring partner and that he can prepare complete, realistic and competitive cost estimates.

Daan Franken

Construction cost consultant

More info

Daan Franken

Construction cost consultant


Dilek Kilic

Construction cost consultant / Project manager

More info

Dilek Kilic

Construction cost consultant / Project manager


Eda Akaltun

Construction cost consultant

More info

Eda Akaltun

Construction cost consultant


Eddy Schwartz

Consultant Bouwkosten

More info

Eddy Schwartz

Consultant Bouwkosten


Gilbert Coers

Account manager

More info

Gilbert Coers

Account manager


Gilbert always seeks for the best possible situation, combination or relationship. With his background in (HTS) technology on the one hand and communication & philosophy on the other, he brings people together. With the aim that all parties win, with each other.

How inspiring is it, with the best specialists on board and always within the set budget, to realise appealing projects and to brighten up our communal environment?

Together you know more, you are stronger and you perform better.

Guido van Veen

Construction cost consultant

More info

Guido van Veen

Construction cost consultant


In 2014, Guido completed the Master's degree in Construction Management & Engineering with honourable mention at the Faculty of Architecture at Eindhoven University of Technology. Before his Master's degree, he obtained his Bachelor's degree in Building Management at the University of Applied Sciences Amsterdam. After his study period, he worked for one and a half years as an asset manager at Arcadis and has been working at IGG since 2016 as a construction cost consultant.

Guido has been working full-time as a cost manager for the large-scale and multidisciplinary Schiphol A-area project. He now focuses on various residential and non-residential construction projects, as well as renovation and healthcare projects.

The strength of Guido is his customer focus, inquisitiveness and involvement in projects. Hans studied Architecture at the MTS in Leiden and then at The Hague University of Applied Sciences (HTS). After this, he worked as a project manager at various construction companies. After completing his post-HBO Construction Cost Expert and BOB trainings, he started as a construction cost consultant.

Hasan Sahin

Construction cost consultant

More info

Hasan Sahin

Construction cost consultant


Indy Steenbergen

Construction cost consultant

More info

Indy Steenbergen

Construction cost consultant


Irene Bointon

Office management

More info

Irene Bointon

Office management


Irene has been working at IGG since 2010. She is responsible for accounting, financial and personnel administration.

Jan Maurits Schoonenberg

NEN 2580 specialist

More info

Jan Maurits Schoonenberg

NEN 2580 specialist


Jeroen Hilbrands

Construction cost consultant / Projectmanager

More info

Jeroen Hilbrands

Construction cost consultant / Projectmanager


Jeroen graduated in Architecture and Construction Engineering at the Hague University of Applied Sciences.

During his education, he gained practical experience at a municipality, architecture firm and various contractors. From that time on, he prefers to give architectural financial advice and has gained some knowledge and experience with a cost consultancy.

Since 2018, Jeroen has been working at IGG as a construction cost consultant. He is involved in, among other things, drawing up estimates and budgets for several projects in various construction phases. Testing budgets and fees, advising project teams and clients on construction costs are also among his specialties.

John Koks

Senior construction cost consultant / Projectcoach

More info

John Koks

Senior construction cost consultant / Projectcoach


John started his engineering studies at the MTS and continued this at the HTS in The Hague. During the early days of his career, John worked as a CAD drafter and project manager at various architectural firms, continuing his studies at the HES in Rotterdam, where he studied Post H.T.O. Business Administration and John successfully completed the Real Estate Management training.

From 1999 to 2017, John worked at Atelier PRO as a construction cost expert and project manager. During his career at PRO he followed the courses Building cost expert, Budgeting in the Design phase, tendering specification surveyor STABU, ""Calculating on Real Estate"" and ""Entrepreneurship in Construction"" (TU-Twente). In addition to construction cost consultancy, his responsibilities consisted of office coordination, including (project) budget monitoring, manpower planning and quality assurance. Starting in 2006, John develops and coordinates the use of BIM with regard to costs and specifications within design and execution processes. Part of this is also sharing knowledge in this area with project partners and clients, such as the Luxembourg government. In 2017, John joined IGG as a senior construction cost consultant and BIM specialist. His responsibilities are: preparing estimates and budgets, reviewing plans and budgets, consulting the client on construction costs, advising the project teams and clients on the regulations, as well as supervising and managing projects in design and execution. For IGG, John is involved in the Schiphol A-area, the Lego Discovery Center in Scheveningen and the reallocation of the Ambachtsschool in Enschede.

In addition to his work at IGG, John is also a guest lecturer at the post-graduate course Building cost expert.

Kadriye Delikus

Office management

More info

Kadriye Delikus

Office management


Lynsey Merling Meijer

Office management

More info

Lynsey Merling Meijer

Office management


Lynsey joined IGG in 2020, she is a management assistant and responsible for marketing activities.

Maarten van der Boor

Construction cost consultant

More info

Maarten van der Boor

Construction cost consultant


Marc Hengstmangers

Director / Senior construction cost consultant

More info

Marc Hengstmangers

Director / Senior construction cost consultant


Marcel started his Architecture degree at the MTS-Arnhem, oriented on execution. After the MTS training, he gained work experiences as a carpenter in a carpentry factory and then at a construction company. Marcel was then given the opportunity to further develop himself by following the BOB training, estimator and work organizer for the construction company. After these courses, he started an internship at Brink Group, where he was later hired and further developed his calculator skills in the area of budgets based on the STABU system and the object oriented budgets according to the NL SfB 'Elementenmethode'. At the Brink Group, Marcel attended the Building Cost Expert training at the Hague University of Applied Sciences.

From 2000 to 2019, he worked in various positions at both engineering firms and construction companies, but always followed the construction costs as a common thread, making his building knowledge so broad that he can handle any problem. From 2004 to 2010, Marcel worked as a construction cost consultant and project manager at ABT. At ABT, Marcel has also followed the training for project manager (POA) as a specification surveyor STABU. At G & S Bouw, Marcel has gained a lot of experience with budgeting based on 3D BIM models.

Marcel has been working as a cost consultant - project manager at IGG since 2019. In addition to his duties such as drafting estimates and budgets, reviewing plans and budgets and advising the client on construction costs, he is also a source of information for his colleagues through his experience. Marcel's strength is his professional and analytical approach to the fulfilment of tasks and objectives, his communication skills and his persuasiveness and decisiveness. In addition, the ability to build bridges between abstract construction costs and executive construction is a specialty based on his experience.

For IGG, Marcel is involved in the large-scale and multidisciplinary Schiphol A-area project.

Marian de Groot

Office management

More info

Marian de Groot

Office management


Marian has been working at IGG since 2004 and is responsible for project invoicing and administration.

Mario Van Veen

Construction cost consultant / Projectmanager

More info

Mario Van Veen

Construction cost consultant / Projectmanager


Mario started his study Architecture at the MTS and gained his practical experience at various architectural firms and contractors. He then studied the Construction Cost Management at the HTS.

Mario has been working at IGG since 2014 as a construction cost consultant and is involved in, among other things, preparing estimates and budgets, reviewing budgets, advising the client on construction costs and developing the knowledge level of the current construction market. In the role of cost consultant, he is very involved and gives advice at an early stage on the design and the development process to guide them towards a good cost and quality ratio, so that as many financial risks as possible can be made transparent or be excluded.

Marjolein Halve

Office management / Bouwkosten

More info

Marjolein Halve

Office management / Bouwkosten


Michael de Joode

Construction cost consultant / Projectmanager

More info

Michael de Joode

Construction cost consultant / Projectmanager


Mike Misset

Contruction cost consultant

More info

Mike Misset

Contruction cost consultant


Mohamed Boutasghount

Construction cost consultant

More info

Mohamed Boutasghount

Construction cost consultant


Natasha van Hoek

Construction cost consultant

More info

Natasha van Hoek

Construction cost consultant


.

Radjen Doekharan

MEP consultant

More info

Radjen Doekharan

MEP consultant


After his studies at the LTS, Radjen immediately started working at a medium-sized MEP company in Zwijndrecht. He has also followed various studies, such as the TSI high-voltage power plant technician, in the evenings. During his career, he worked as a (main) calculator at various MEP companies. Radjen also gained a lot of experience at a large MEP consultancy as a cost consultant.

Since 2018, Radjen has been working as a senior MEP cost consultant at IGG. In addition to his responsibilities such as making cost estimates, providing MEP cost advice, drafting second opinions, investment calculations and operating budgets, he is involved in a wide variety of complex projects.

Radjen provides advice on building-related MEP costs in all phases of a construction cycle.

Rob Passchier (RKN)

Register costmanager (RKN) / Projectcoach

More info

Rob Passchier (RKN)

Register costmanager (RKN) / Projectcoach


Rob studied architecture at the HTS in The Hague and from that moment on has been interested in the possibilities of computerisation and digitisation. He uses his analytical ability to apply calculation models to problems. If there are none or unclear frameworks for an issue, he will start there. He does not hesitate to point out unrealistic budgets to the client and he identifies risks at an early stage, so that there is sufficient time to anticipate them. Identifying bottlenecks and coming up with solutions are inextricably linked.

He has a background of more than 15 years as a construction cost consultant at a medium-sized architectural firm and a construction cost consultancy, and has gained a lot of experience with school construction, care institutions and large housing projects. Rob has been working at IGG since 2013. He is particularly interested in lifecycle costs, as these can be strongly influenced during the initiation and design phase. After all, the essential choices are made here in terms of MEP, materials, components, etc.

Sustainability is therefore logically an extension of the areas of interest, because sustainable use of materials can help to limit the lifecycle costs.

Ryan Bidessi

Construction cost consultant - installations

More info

Ryan Bidessi

Construction cost consultant - installations


Sander van Heijningen

Construction cost consultant

More info

Sander van Heijningen

Construction cost consultant


Stephanie Kartoikromo

Construction cost consultant

More info

Stephanie Kartoikromo

Construction cost consultant


Steven Oosterling

Senior tender and contractmanagement / Projectmanager

More info

Steven Oosterling

Senior tender and contractmanagement / Projectmanager


Steven is an all-round project leader who has supervised construction and real estate related projects for both clients and contractors. In recent years he has specialised in tenders, where he has sat on both sides of the table.

In the role of tender manager or consultant, he has since been involved in more than 80 tenders. His Architectural (HTS) and Public Administration (University) background comes in handy here.

For Steven, a tender is never a goal in itself, but always a means to make projects a success. After all, basically a tender is nothing more than asking the market a question and ensuring that a good answer is given. Preferably several, because then there is something to choose from. By not only organising the tendering procedure, but also formulating the request correctly, the chance of a correct answer considerably increases. A tender forms the basis for future cooperation.

Steven has been working at IGG since 2016 and is always closely involved in his projects, where the interests of the client always come first.

Sui Ming Li

Senior construction cost consultant / Projectmanager

More info

Sui Ming Li

Senior construction cost consultant / Projectmanager


After the HTS in Rotterdam, Sui Ming started at Randstad Polytechniek (technical employment agency) as a structural draftsman or employee. He has worked here on various residential and non-residential construction projects, for architects and engineering firms, municipalities and construction companies.

From 1996 to 1998, he worked for Arcadis Bouwinfra as the first architectural draftsman for the development of De Resident project between Central Station and The Hague Municipality. Sui Ming had previously indicated that he wanted to gain cost knowledge from the cost department, but unfortunately that was not possible at the time.

In October 1998 he started as a calculator at Ingenieursbureau Multical. There he drew up the cost estimates for various types of construction projects. He supports the Specifications Department with surveying specifications. After obtaining his diploma of the basic training Construction Cost Expert at the Hague University of Applied Sciences in 2005, he started growing as a construction cost consultant, where he can run projects independently.

From 2006 to 2019, Sui Ming works at Aronsohn advising engineers as a construction cost consultant and since 2015 also as a specification surveyor after following the training Specification Surveyor for residential and non-residential construction. Within Aronsohn Constructies, he prepared the structural cost estimates from schematic design up to and including the tender phase for all large and complex projects, such as the new construction of the Erasmus MC in Rotterdam, Meander MC in Amersfoort, Renovatie Sportpaleis Ahoy and Stadskantoor Deventer. He has also written the structural specifications for projects such as Oosterdokseiland kavel 5b / 6, renovation Naturalis and OCC Spuikwartier.

For the Aronsohn Management department, he made structural budget estimates for many universities such as UvA, VU, RUL, TUD, TU/e and RUU and he assessed contract variations for all current projects. Aronsohn has been working with BIM since 2010, so all projects are modeled with Revit and as a result he gained a lot of knowledge about working with BIM and drawing up cost estimates based on the IFC model.

Sui Ming joined IGG in 2019 as a senior construction cost consultant. His duties consist mainly of drafting budgets, checking plans against budgeting and consulting clients on controlling construction costs.

Thandi Daal

Construction cost consultant

More info

Thandi Daal

Construction cost consultant


Will Elsman

Consultant Bouwkosten

More info

Will Elsman

Consultant Bouwkosten


Wim Mathijssen

Construction cost consultant

More info

Wim Mathijssen

Construction cost consultant


Xander Lamb

Construction cost consultant

More info

Xander Lamb

Construction cost consultant


Yuk Ling Chung

Construction cost consultant

More info

Yuk Ling Chung

Construction cost consultant


Yuk Ling studied Architecture and Construction Engineering at the Hague University Of Applied Sciences and specialised in constructions during her studies. She has always been interested in calculations and figures during the course of her studies.

Since 2018, Yuk Ling has been working as a construction cost consultant and she is involved in various residential, non-residential, civil engineering and renovation projects.

Do you also want to collaborate with IGG?

Do you have questions or are you interested in a substantive introduction?

Please contact us