Roof extension

A roof extension for more living space

Create space on top of your home with a building approach that takes structure, the permit process and a neat finish into account.

What does a roof extension involve?

A roof extension is a major but valuable way to create extra space. Flexora Bouw guides the building process with attention to load-bearing capacity, permits, materials and finish.

A roof extension needs more preparation than a standard renovation. The existing structure, roof build-up, installations and the connection to the facade and roof all have to be examined carefully.

Flexora Bouw works from a practical building plan that makes the technical side, the schedule and how you live in the house during the work clear from the start.

Costs, preparation and finish

A good building plan makes choices visible in advance, so the technical side, the schedule and the finish become concrete before work starts.

What determines the cost of a roof extension

For a roof extension, the scope of the project is mainly determined by load-bearing capacity, structural adjustments, roofing, the stair opening, facade finish, insulation, installations and interior fit-out.

Because the work takes place on top of an existing house, access, temporary weather protection and the sequence of shell and fit-out work also weigh heavily.

Permits and structural preparation

A roof extension often needs more coordination than smaller renovations. Depending on the house, the dimensions, the streetscape and the municipality, a permit may be required.

Always have the rules and the structural feasibility checked before work starts. A good survey prevents load-bearing capacity, junctions or installations from becoming a discussion only during the build.

Materials, weathertight building and planning

Choosing materials for a roof extension is not only about appearance, but also about weight, insulation, waterproofing, cladding and the connection to the existing roof and facade surfaces.

The schedule has to account for weather-sensitive moments. That is why shell work, making the structure watertight and fit-out must follow each other logically.

A roof extension is often well suited to prefab: wall and roof elements are produced in advance and placed in a short time, so the house is open only briefly. Whether prefab works for your home depends on the structure, access and lifting options, and we assess it in the advice meeting.

Benefits

Lots of extra space without moving

A roof extension can add bedrooms, a workspace or a complete extra floor.

Structure considered early

Load-bearing capacity, roof build-up and junctions are taken seriously from the start.

A clear process

On a larger building project, overview of the schedule, sequence and communication is essential.

From preparation to handover

These steps show how a project of this type is prepared and built, from the first survey to the handover.

  1. 01

    Surveying the house

    We look at the existing situation, the space you want and the points of attention.

  2. 02

    Preparation and coordination

    Structural and practical aspects are worked out before construction starts.

  3. 03

    Shell and weathertight

    The extension is placed carefully and protected against the weather.

  4. 04

    Fit-out and handover

    Interior finish and details are completed for a usable, tidy space.

Frequently asked questions

What is the difference between an ‘opbouw’ and a ‘dakopbouw’?

The two Dutch terms are often used interchangeably. Usually they mean extra space on top of, or in place of, the existing roof structure.

Can every house take a roof extension?

Not always. The existing structure, regulations and technical possibilities determine what is responsible.

Does Flexora Bouw help with the preparation?

Yes. We help think through the schedule, the structural points of attention and the steps needed before construction.

Can a roof extension be prefabricated?

Often, yes. With a prefab roof extension the elements are produced in advance and assembled on site, keeping the build time on the roof short. Structure, access and lifting options determine whether that works for your home; we assess this beforehand.

Get acquainted

Talk to us about your plans for a roof extension.

Send your enquiry through the contact page. We’ll then discuss your plans, your home and a sensible next step.

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