Co'Building

Our mission

Supporting your renovation projects

Introductions to 3 certified contractors, a dedicated Works Planner, and support from an architect.

GoKelvin tool · free

Assess the energyperformance of your home

In a few questions, estimate your energy rating, then discover the work to consider and its budget to improve it.

  • › Estimate of your energy rating (DPE)
  • › Renovation scenarios and their budgets
  • › Free, in 2 minutes, no commitment
Energy rating
A · efficientG · inefficient

A few questions about your home, and its energy rating estimated on the spot.