Technische Installaties Jonker, also known as Jonker Totaaltechniek, is a specialist installer based in Uitgeest, serving homes and businesses across North Holland. With more than 25 years of experience, the company provides end-to-end support, from design and advice through installation and renovation. Its services cover central heating boilers, radiators, gas and heating systems, ventilation, air conditioning, plumbing, water and drainage, bathrooms and sanitary facilities.

Jonker also works in roofing, zincwork, rainwater drainage, electrical installations, communications, home automation and KNX systems, lighting, security and control technology. For customers seeking energy solutions, the company installs solar panels, solar boilers, heat pumps, heat-recovery systems and wood-fired central heating appliances, and offers energy advice. Jonker can equip or renovate an entire home and help adapt houses for changing mobility needs.

The company serves private clients as well as contractors and small and medium-sized businesses, primarily in the Uitgeest area and nearby towns including Castricum, Heemskerk, Alkmaar, Zaandam and Amsterdam