About us
At GnJ Developments, we build more than just structures — we build trust. Since our founding in 1994, we have become a recognised name in quality construction across the Netherlands as well as Portugal.
Who we are
Jill Sheen
We follow all national and IMPIC safety regulations, ensuring every site meets required legal and industry standards.
Guy Heffelaar
Our team and subcontractors receive regular safety training and daily briefings to stay alert, informed, and responsible.
Architect X
All workers use certified PPE and high-quality equipment, with site-specific risk assessments guiding every task.
Our mission
To turn ideas into lasting structures through quality, craftsmanship, and care.
We aim to make every project a reflection of our values: reliability, precision, and partnership.
Health & Safety
Certified And Compliant
Trained and Aware
Equipped and Protected
Monitored and Improved
Giving Back
Beyond construction, Guy Heffelaar is actively involved in volunteer work in Bangladesh, where he supports local building initiatives that provide safe housing and infrastructure for underprivileged communities. His hands-on approach and commitment to sustainable craftsmanship extend beyond Europe — helping to create lasting, positive change where it’s needed most.
CSR
At GnJ Developments, we build more than just structures — we build trust. Since our founding in 1994, we have become a recognised name in quality construction across the Netherlands as well as Portugal.
Terms & Conditions
At GnJ Developments, we build more than just structures — we build trust. Since our founding in 1994, we have become a recognised name in quality construction across the Netherlands as well as Portugal.
Why Choose Us
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Let’s Build Something Together
We’d love to hear about your project and how we can help. Contact us today for a free consultation or quote.
Email info@gnjdevelopments.com
Phone number +31 (0)6 123 456 78
Based in the Portugal | Designed with Dutch Precision
© 2025 GnJ Developments, Lda.