On this page
Prices shown as “from” are indicative starting amounts for the stated scope. Your quotation specifies materials, labour, VAT and additional work.
Price indications and what to compare
| Work | Indicative starting price | Scope and assumptions |
|---|---|---|
| Roof extension: initial project indication | From € 25,000 | Broad market range; specify scope, VAT and additional work. |
Market estimates consulted on 2 October 2026. These are not fixed Multi Concurrent rates. Your project quote specifies the price, VAT and included work.
Shell-only or ready to use
A shell-only price may exclude plastering, painting, flooring, heating and complete electrical work. Record the handover condition of each room and which items the client will arrange.
The existing home
A new storey adds weight. The structural engineer investigates whether the existing load paths and foundations can carry it. Include reinforcement in the budget as soon as it is found necessary.
Lifting and temporary protection
Prefabricated elements need a suitable crane position and transport route. A narrow street may require traffic measures or lifting over the house. The home must be protected from the weather while the roof is open.
When is the price reliable?
A quote becomes more specific after the survey, design and sufficient structural detail. A figure given before this preparation remains an initial indication based on assumptions.
From preparation to handover
Space requirements
Decide which new rooms and usable floor area you need.
Site survey
Assess the existing roof, load paths and access.
Design
Develop the height, façades, daylight provision and stairs.
Structural design
Have the additional loads and their transfer through the building calculated.
Permits
Have the design and local rules assessed.
Quote
Itemise the shell structure, installations, finishing and lifting work.
Construction planning
Plan the lifting position, suitable weather conditions and temporary protection.
Opening the roof
Open the roof in a controlled way and protect the home.
Installing the structure
Build the walls and roof in accordance with the structural design.
Weatherproofing
Complete the windows, doors, roof covering and connection details.
Interior work
Install the stairs, services, insulation and interior finishes.
Handover
Inspect the connections and finishes together.
Frequently asked questions
Is the price on this page a quote?
No. An estimate or worked example is for initial planning. The property, materials and agreed scope determine your quote.
What should I include in a quote request?
Describe the work and include the town, postcode, photographs, dimensions and any available drawings. Add your preferred start period. Larger projects need a site visit to establish the scope and price.
Do I need a permit?
This depends on the work, the address and local rules. Check your plan through the Dutch Omgevingsloket and have structural alterations assessed in advance. Work that does not need a permit must still comply with applicable building rules.