Windows in a rental property: obligations in Belgium
Landlord obligations for windows in a rental property in Belgium. Replacement, repair, double glazing and cost allocation.
Allocation of obligations
The allocation of window-related costs between landlord and tenant follows the principle of major repairs (landlord) and tenant repairs (tenant).
| Intervention | Paid by |
|---|---|
| Frame replacement | Landlord |
| Glazing replacement (wear and tear) | Landlord |
| Weatherproofing compliance | Landlord |
| Repair of a broken pane (tenant’s fault) | Tenant |
| Maintenance of seals and hardware | Tenant |
| Window cleaning | Tenant |
| Interior painting of wooden frames | Tenant |
| Exterior painting of wooden frames | Landlord |
For the complete list of repairs, see our guide on tenant repairs.
When to replace windows
Signs requiring replacement
- Recurring water infiltration
- Draughts despite windows being closed
- Permanent condensation between panes
- Rotted or deformed frames
- Cracked or broken glazing
Impact on the EPC
Window replacement significantly improves the EPC score:
| Glazing type | U-value (W/m2K) | EPC impact |
|---|---|---|
| Single glazing | 5.8 | Very poor |
| Standard double glazing | 2.8-3.0 | Acceptable |
| HR double glazing | 1.0-1.6 | Good |
| Triple glazing | 0.5-0.8 | Excellent |
A better EPC allows the landlord to maintain the right to index the rent without restriction.
Costs and funding
Replacement cost
| Window type | Indicative cost (installation included) |
|---|---|
| PVC double glazing | 300-600 EUR/window |
| Aluminium double glazing | 500-900 EUR/window |
| Wood double glazing | 600-1,200 EUR/window |
| Triple glazing (all materials) | +30 to 50% |
Available grants
The Regions offer grants for window replacement as part of energy improvement. See our guides on grants in Brussels and Wallonia.
Tax deductibility
Window replacement may qualify for a tax deduction for energy-saving works. See our guide on rental taxation.
Practical tips
For the landlord
- Check the condition of windows at each tenant changeover
- Plan the progressive replacement of single-glazed windows
- Prefer HR double glazing for better return on investment
- Take advantage of regional grants to reduce costs
For the tenant
- Maintain seals and hardware regularly
- Report any weatherproofing issue to the landlord
- Clean windows and sliding rails
- Do not force faulty closing mechanisms
The condition of windows is checked during the entry and exit property inventory. For a clear lease on obligations, use our lease generator.