Tekenpunt/Projects/Conservatory Bilthoven
Completed project · Conservatory PLAN N°PRJ-BLT-2024 / SCALE 1:100 / 2024

Conservatory in Bilthoven

A villa in Bilthoven in the wooded Utrechtse Heuvelrug area received a glass conservatory as an extra dining room on the ground floor. Permit-free design, steel construction with maximum glazing to make the most of the view over the wooded garden.

TypeConservatory
LocationBilthoven
Surface area+14 m²
Lead timePermit-free
Year2024
ResultGlass dining room
§01 From sketch to completion

The complete process

01 · Challenge

Maximum views over the Heuvelrug

The owners of a spacious villa in Bilthoven wanted to detach the dining area from the kitchen and relocate it to a separate, bright room overlooking the forest garden. The property is situated on the wooded Utrechtse Heuvelrug, a rural area with strict rules for extensions. Nevertheless, a compact conservatory of 14 m² proved entirely permit-free thanks to the large back garden and the correct positioning relative to the plot boundaries.

02 · Our approach

Slender steel profiles for maximum glazing

We designed a conservatory with extra-slender steel profiles that provide maximum glazed surface area. The roof is entirely in glass with a light anti-reflective coating that limits excessive heat build-up in summer. The conservatory connects to the existing tiled floor of the living room, so there is no height difference. We resolved ventilation with tilt windows in the roof plane that open automatically when the indoor temperature becomes too high.

03 · Result

Permit-free, immediate start

The contractor was able to start within two weeks of receiving the drawings. The 14 m² conservatory is now the family's favourite spot: a bright dining room with a panoramic view of the woodland garden. The insulated glazing ensures the space is comfortable even in winter. The clients are extremely satisfied with the result and immediately commissioned Tekenpunt for a new bathroom.

Key project details

Drafting
Construction drawing + construction details
Permit
Permit-free design
Structure
Slim steel profiles + glass roof
3D
Impression for the owner
Lead time
Drawings ready within 2 weeks

What we delivered

  • Existing and new situation drawings (floor plans, elevations, sections)
  • Permit-free advice and dimension check
  • Structural calculation for slender steel profiles and glass roof
  • 3D visualisation for the residents
  • Ventilation advice including automatic tilt windows
  • Execution-ready details allowing the contractor to start immediately
§03 Adding a conservatory yourself?

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Last updated: June 2026 Content reviewed by the Tekenpunt team · in-house architect & KIWA-certified structural engineer