Extensions · Roof extensions · Dormers — Amsterdam, Amstelveen, Haarlem & Zaandam
More home.
Same address.
Design, permits and construction of extensions, roof extensions and dormers — at a fixed price and with one point of contact from the first sketch to final finishing.
Registered contractor
CoC 92576907
CAR insured
Construction All Risk during the build
VCA
Safe working practices on site
Fixed-price agreement
No surprises afterwards
In-house structural engineer
Structural calculations included
Permits arranged
Complete permit process
Three ways to create space
One house, three possibilities.
Why Renova Group
How we work — in concrete terms
Not generic contractor promises, but clear agreements that we put in writing.
- 01
Fixed-price agreement
One price before work begins. Additional work only after your written approval.
- 02
Permit process handled
We arrange drawings, structural calculations and the complete application.
- 03
One point of contact
One project manager coordinates structure, services, kitchen, bathroom and finishing.
- 04
From design to handover
Design, engineering, construction and complete finishing under one roof.
- 05
In-house structural engineering
Foundation, structure and stability are calculated before the price is fixed.
- 06
Written workmanship guarantee
Construction and finishing are documented and checked at handover.
Made to measure, not catalogue construction
Prefab is faster. Custom work belongs to your house.
We follow the dimensions and character of your home: brickwork continues through the façade, windows follow the existing rhythm and insulation connections are detailed without thermal bridges.
- Design follows the house
- Kitchen and bathroom finishing by one company
- Details that satisfy design review and future buyers
- Average construction time: 3–4 weeks
Projects
Recently completed
Costs
What does more space cost?
All figures are estimates including 21% VAT at 2026 price levels. Use the calculator to explore your situation in one minute.
Experiences
What residents say
“A 22 m² extension in exactly four weeks. Renova handled the drawings, engineer and municipality, and the fixed price matched the final invoice to the euro.”
“We received written confirmation that the dormer was permit-free. It was installed on Monday and the attic was a finished bedroom the following week.”
Curious what is possible with your home?
Book a free consultation. We will review the options, the permit situation and an initial cost estimate — with no obligation and a reply within one working day.
contact@renovaco.nlKvK 92576907