Direct Communication
One fixed point of contact
Local & Reliable
Friesland, Groningen & Drenthe
Clear Pricing
No surprise costs afterwards
Chamber of Commerce
Registered contractor (92161227)
Extra Living Space & Light
Home Extensions in the northern Netherlands
Expand your lounge or kitchen with a bespoke ground-floor extension. Heidstra Bouw handles the entire build from excavation and foundations to timber framing, insulated roofs, and bi-fold garden doors.
From Foundations to Turnkey Completion
A rear or side extension is the most effective way to gain substantial floor area without relocating. Whether enlarging your main kitchen, adding an open-plan living room, or building a utility room, structural integration with the original building is paramount.
We coordinate the complete build sequence: ground investigation, concrete piling or strip footings, opening up the exterior wall with engineered steel lintels, insulated roof framing with EPDM membranes, and brickwork matching or modern vertical timber cladding.
Extension Projects
Completed Extensions
Julianalaan Extension, Buitenpost
Complete garden extension from ground excavation to dark vertical cladding and wide outward-opening doors.
View Julianalaan projectAntoon Coolenlaan Extension, Groningen
Rear elevation expansion with structural steel beam integration and timber frame construction.
View Antoon Coolenlaan projectExtension Possibilities
Tailored designs to complement your home and lifestyle.
Kitchen & Living Extensions
Extending the rear by 2.5 to 4 meters to create an expansive, light-filled family kitchen diner.
Roof Lanterns & Sliding Doors
Installing insulated aluminium roof lanterns and multi-panel sliding doors for seamless indoor-outdoor living.
Timber Frame or Traditional Masonry
Choosing between rapid high-insulation timber frame or traditional matching brick construction.
Utility & Mudrooms
Practical side additions accommodating laundry appliances, extra storage, and a separate boot entrance.
Step-by-step plan
From First Sketch to Completion
Survey & Advice
We visit your home, measure up the existing situation, and discuss the desired dimensions, exterior doors and glazed frames, and permit-exempt options.
Quote & Planning
You receive a detailed quotation with a fixed price. Following approval, we prepare structural calculations and order the materials.
Groundwork & Construction
Our team works quickly and expertly to build the foundations, structural shell and steel frame, and make the roof wind- and watertight.
Finishing & Aftercare
We take care of plasterwork, electrical installations, underfloor heating, and facade finishes. Upon handover, we walk through the work together and record any remaining points.
Active across the Northern region
Based in Buitenpost, we work for homeowners and clients across Friesland, Groningen and Drenthe. Explore our regional coverage and completed local projects.
Guides on House Extensions
Read our articles on extension pricing, foundations, and planning regulations
Extension planning permission 2026: when is a permit required?
Planning an extension or bump-out? Learn when you need a permit, prior notification, or permit check in 2026 under the Dutch Environment and Planning Act.
Read more
CostsExtension Costs for 15 m², 20 m², and 25 m²
What does an extension of 15 m², 20 m², or 25 m² cost? Review rough price guidelines, costs per m², and key factors determining overall costs.
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CostsExtension Foundation Costs: What Influences the Price?
What does an extension foundation cost? Learn which foundation options, subsoil conditions, site access, and structural weight impact overall pricing.
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Frequently Asked Questions about Extensions
Key details on construction costs, planning permits, and schedules.
Planning a home extension?
Schedule a free on-site survey and explore what is possible for your property.
