Frequently asked questions about installing windows in new buildings

Frequently asked questions about installing windows in new buildings

Quick overview

• Installation in new buildings differs from replacement: construction tolerances and façade finishing matter.
• Proper installation prevents drafts, moisture ingress and heat loss.
• Coordinate works with the developer and finishing contractors.
• Typical scope: measuring, delivery, installation with proper flashing, vapor/hydro barriers, sills and drip edges.
• Drainage, expansion gaps and correct sealants are essential.
• Warranties cover profiles and glass units, but not defects from incorrect finishing if installation was compliant.

Why installing windows in a new building is special

New buildings may be handed over in various stages: bare shell, semi-finished or final finish. When walls or reveals are unfinished, installers must consider:

• Construction tolerances: the opening geometry can be off; skilled measurement is required.
• Interface with the façade: use external waterproofing tape and internal vapor barrier tapes around the frame.
• Reveal finishing: to avoid cracks and thermal bridges, align installation depth with finishing layers and leave movement joints.

Main installation steps

1. Precise measurement and checking of the opening (levels, diagonals, plumb).
2. Delivery and verification of the window set (profile, fittings, reinforcing, glass unit).
3. Anchoring to the structure with anchors or mounting plates.
4. Sealing the exterior joint with waterproof tape and the interior with vapor barrier.
5. Filling the mounting gap with polyurethane foam considering warm-cold zones.
6. Installing sills and external drip edges.
7. Adjusting sashes, testing hardware and providing user instructions.

Common issues and prevention

• Drafts around the perimeter: usually due to poor sealing or low-quality tape. Check the joint and replace sealing if needed.
• Condensation: often caused by insufficient ventilation or thermal bridges. Ensure fresh air supply (vent valves, micro-vent), and check insulation of reveals.
• Cracks in plaster: occur when window position doesn’t consider plaster layers. Agree installation line and leave compensation joints.
• Improper water drainage: drip edges must have a slope and extend beyond the façade edge.

Anchors vs. mounting plates — what to choose?

• Anchors provide strong fixation and suit masonry and monolith structures.
• Mounting plates are useful for thin walls and for fine adjustment of the position.
• In new builds choose based on structural strength and manufacturer recommendations.

Choosing windows for new construction

• Profile: multi-chamber PVC profiles for better thermal performance.
• Glass unit: double-glazed with Argon-fill is a good balance; triple-glazed for higher thermal or acoustic needs.
• Hardware: corrosion-resistant with adjustment options.
• Extras: ventilation valves, restrictors, anti-burglary fittings if required.

Acceptance tips

• When signing the acceptance act, inspect for chips, scratches, installation evenness and hardware function.
• Request the installation log and care instructions.
• Photograph joints and reveals before and after finishing for warranty cases.

FAQ — short answers

Should I wait for full finishing to install windows?

No. Installing during rough finish is common and often preferable if the sequence is coordinated: protect windows from construction debris and correctly seal joints before façade insulation.

What if the opening is uneven?

Openings may need preparation: leveling, special plates, or a custom frame to compensate. Accurate measurement and an experienced crew are key.

Does warranty cover installation errors?

Manufacturer warranty covers profile and glass units, but not faults caused by improper installation. Use certified installers and keep acceptance documents.

Can windows be installed in winter?

Yes, but special foams and tapes suitable for low temperatures are required.

How to reduce street noise?

Increase glass unit thickness, use laminated or asymmetric glazing and acoustic-rated profiles.

When to install sills and drip edges?

External drip edges should be installed right after fixing the window; sills can be installed at the same time to avoid gaps.

If you want, we can prepare a checklist for accepting windows in a new building and help select an optimal configuration from profile to ventilation solutions.