Pillar guide · construction renovation brussels
Construction & Renovation in Brussels
Complete guide to construction and renovation in Brussels: planning permission, Renolution grants, EPC standards, obligations, and procedures in the BCR.
Introduction: building and renovating in the Brussels-Capital Region
Construction and property renovation in the Brussels-Capital Region take place within a dense and specific regulatory framework, shaped by some of the most ambitious environmental requirements in Europe, a distinctive planning permission regime, and a comprehensive array of grants and financial incentives designed to accelerate the energy transition of Brussels’ building stock.
Whether you are considering building a new development, renovating a townhouse, insulating an apartment, or converting a commercial building into residential units, this guide provides a complete overview of the obligations, procedures, and financial support applicable in the BCR in 2026.
The Brussels context is distinctive: the building stock is old (over 60% of dwellings date from before 1970), urban density is high, and heritage constraints are frequent. Renovation therefore represents a far greater challenge than new construction in terms of volume.
Planning permission in the Brussels-Capital Region
When is planning permission required?
In the Brussels-Capital Region, planning permission (permis d’urbanisme) is required for:
- Any new construction
- Any demolition (total or partial)
- Any transformation affecting the structural stability of the building
- Any modification of the external appearance (facade, roof, window frames, addition of a conservatory, terrace)
- Any change of volume (extension, raising of the building, annex)
- Any change of use (office to residential, shop to dwelling, conversion of a dwelling into flats)
- Felling of certain mature trees
Works exempt from planning permission
Some works are exempt from planning permission, provided they meet specific criteria:
- Maintenance and repair works that do not alter the external appearance
- Interior works with no structural modification (painting, floor coverings, replacement of kitchen or bathroom)
- Replacement of window frames on a like-for-like basis (same dimensions, same material, same colour)
- Installation of solar panels on a flat roof, not visible from the public highway
- Certain garden works (subject to area and height conditions)
Important note: even when exempt from planning permission, these works must comply with the Regional Urban Planning Regulation (RRU) and, where applicable, the prescriptions of any PPAS (Local Land Use Plan) applicable to the neighbourhood.
The planning application procedure
A planning application is submitted to the municipality where the property is located. The procedure comprises:
- Assembling the file: architectural plans (mandatory for works subject to a permit in Belgium), application form, photographs, explanatory note, EPC report where applicable.
- Submission and acknowledgement of receipt: the municipality checks the completeness of the file.
- Public inquiry (if required): for projects of a certain scale, neighbours and the public are informed and may submit observations.
- Advisory committee hearing (if applicable): for projects requiring derogations from the RRU or PRAS.
- Opinion of the delegated civil servant (Brussels-Capital Region): for certain categories of projects.
- Municipal decision: granting or refusal of the permit, within a period of 45 to 150 days depending on the type of procedure.
Appeals and litigation
In the event of refusal or the granting of a permit subject to conditions deemed excessive, an appeal may be lodged with the Government of the Brussels-Capital Region (administrative appeal) or with the Council of State (annulment proceedings). The appeal deadline is 30 days from notification of the decision.
EPC standards for construction and renovation
New construction: the passive standard
The Brussels-Capital Region was a pioneer in Europe in imposing the passive standard (or very low energy) for all new residential construction since 2015. Specifically, the requirements are:
- Net heating energy requirement: maximum 15 kWh/m²/year (passive standard) or 45 kWh/m²/year (very low energy standard with compensation).
- Air tightness: blower-door test attesting n50 ≤ 0.6 vol/h.
- Overheating: compliance with an overheating indicator to limit cooling requirements.
- Primary energy consumption: maximum 45 kWh/m²/year for new residential units.
These requirements make Brussels one of the most demanding regions in the world for the energy performance of new buildings. The additional construction cost is estimated at 5 to 15% compared with conventional construction, but is offset by energy savings over the building’s lifetime.
Renovation: progressive requirements
For renovation works, EPC requirements depend on the scope of the works:
- Major renovation (replacement of more than 75% of the heat loss surface area and replacement of all technical installations): requirements close to those for new construction.
- Standard renovation (works on one or more elements without reaching the major renovation threshold): element-by-element requirements (maximum U-value for insulation, minimum performance for installations).
- Replacement of individual elements (window frames, boiler, roof insulation): compliance with minimum insulation values or performance standards for the element concerned.
The EPC responsible
For any project subject to planning permission and involving works affecting energy performance, an EPC responsible (responsable PEB) must be designated. This Bruxelles Environnement-accredited professional is responsible for:
- Establishing the EPC proposal (at the permit stage)
- Verifying that the works comply with EPC requirements
- Establishing the final EPC declaration (on completion of works)
Failure to comply with EPC requirements can result in an administrative fine of €5 to €100 per m² of the area concerned, imposed by Bruxelles Environnement.
Renolution grants
Overview of the scheme
The Renolution grants are the Brussels-Capital Region’s main financial support mechanism for energy renovation and home improvement. They replaced and unified the former energy grants and renovation grants since 2022.
The amount of the grants depends on two parameters:
- Household income category: category A (lowest incomes, highest grants), category B (middle incomes), and category C (highest incomes, reduced grants).
- Type of works carried out.
Main grants available
Roof insulation:
- Category A: up to €50/m²
- Category B: up to €35/m²
- Category C: up to €20/m²
Facade insulation:
- Category A: up to €90/m²
- Category B: up to €65/m²
- Category C: up to €40/m²
Floor insulation:
- Category A: up to €40/m²
- Category B: up to €30/m²
- Category C: up to €20/m²
Replacement of window frames and glazing:
- Category A: up to €110/unit (frame + glazing)
- Category B: up to €80/unit
- Category C: up to €50/unit
Technical installations:
- Heat pump: grant of €4,000 to €8,000 depending on type and category
- Solar water heater: grant of €2,500 to €4,000
- Photovoltaic solar panels: grant of €1,000 to €2,500
- Mechanical ventilation with heat recovery (MVHR): grant of €1,500 to €3,500
Conditions and procedures
To benefit from Renolution grants:
- Works must be carried out by an accredited contractor and meet the minimum technical requirements.
- The application must be submitted within 12 months of the final invoice for the works.
- The property must be located in the Brussels-Capital Region and be at least 10 years old.
- The applicant must be the owner, usufructuary, or tenant (with the owner’s consent) of the property.
Grants are cumulative with each other and with the Brussels green loan (preferential rate of 0 to 2% for energy renovation works).
The Brussels green loan
How it works
The Brussels green loan is a reduced-rate loan offered by the Region through partner organisations (Homegrade, Fonds du Logement). It is intended to finance energy renovation works:
- Amount: €15,000 to €75,000 (depending on income and works).
- Rate: 0 to 2% depending on income category.
- Term: up to 30 years.
- Cumulation: can be combined with Renolution grants.
Eligibility conditions
- The property must be located in the Brussels-Capital Region.
- The works must relate to energy renovation (insulation, heating, ventilation, renewable energy).
- Household income must not exceed a set ceiling (generally categories A and B).
Construction and renovation costs in Brussels
New construction
The cost of new construction in the Brussels-Capital Region is above the national average, due to EPC requirements (passive standard), the logistical complexity of a dense urban environment, and land costs:
- Standard (passive) construction: €1,800 to €2,500/m² (excluding land and fees).
- High-end construction: €2,500 to €3,500/m².
- Developer apartment: sale price of €3,500 to €6,000/m² (including land, construction, and developer’s margin).
The additional cost attributable to the passive standard (versus conventional construction) is estimated at 5 to 15%, approximately €100 to €250/m² extra.
Renovation
Renovation costs in Brussels vary according to the scope and quality of the works:
- Refurbishment (painting, floor coverings, sanitaryware): €300 to €600/m²
- Intermediate renovation (+ electrical, plumbing, kitchen): €600 to €1,200/m²
- Full renovation (structure retained, everything else replaced): €1,200 to €2,000/m²
- Major renovation (structural intervention, full compliance upgrade): €1,500 to €2,500/m²
Worked example: for a 150 m² Brussels house with an EPC G rating, achieving EPC B typically requires:
- Roof insulation: €8,000 to €15,000
- Facade insulation: €15,000 to €30,000
- Replacement of window frames: €12,000 to €25,000
- Boiler replacement (heat pump): €10,000 to €18,000
- Ventilation (MVHR): €5,000 to €10,000
- Estimated total: €50,000 to €100,000, of which €10,000 to €25,000 may be covered by Renolution grants.
Heritage constraints
Listed and inventoried buildings
Brussels has a rich architectural heritage — Art Nouveau, Art Deco, eclecticism, modernism — of which a significant portion is protected by listing or inclusion in the heritage inventory.
Owners of listed buildings must:
- Obtain prior authorisation from the Directorate of Monuments and Sites for any works (including interior works in some cases).
- Use original materials and techniques in restorations.
- Keep the building in a good state of conservation.
In return, specific financial support is available (restoration subsidies, partial exemption from property withholding tax, reduced VAT of 6%).
Protected areas and PPAS
Some Brussels neighbourhoods are covered by Local Land Use Plans (PPAS) or protection zones that impose specific architectural prescriptions: maximum height, facade materials, building envelope, siting. These prescriptions are in addition to planning permission requirements and can limit transformation possibilities.
VAT on construction and renovation
Applicable VAT rates
- New construction: VAT at 21% on all works.
- Renovation of a dwelling more than 10 years old: reduced VAT at 6% on the works (conditions: private residential use, more than 10 years old, works carried out by a registered contractor).
- Demolition and reconstruction: under certain conditions, the 6% rate may apply to the reconstruction of social housing or within the framework of urban renewal policies. The conditions have been modified and restricted in recent years — verify current rules before proceeding.
The difference between 6% and 21% VAT represents a major financial issue. For renovation works of €100,000 excluding VAT:
- VAT at 6%: €6,000
- VAT at 21%: €21,000
- Saving: €15,000
It is therefore essential to verify eligibility for the reduced rate before committing to works.
The architect: a mandatory partner
Obligation to engage an architect
In Belgium, engaging an architect is compulsory for all works subject to planning permission (with a few minor exceptions). The architect is responsible for:
- Designing the project (plans, technical specifications)
- Submitting the planning application
- Supervising the execution of works
Fees
Architects’ fees are no longer set by a legal scale following the liberalisation of the profession. They are negotiated freely and generally range between 7 and 12% of the contract value for a full appointment (design + supervision). For major projects, a fixed fee may be agreed.
The role of the property expert in construction and renovation
A certified property expert may be involved in construction and renovation projects to:
- Assess a property before renovation: determine its current value and estimate the expected uplift after works, in order to verify the economic rationale of the project.
- Record the condition before works: carry out a detailed schedule of condition of the property and adjacent properties (pre-works survey, agreed by all parties), particularly important in the Brussels context where terraced houses are the norm.
- Damage expertise: in the event of defective works, construction defects, or damage caused to neighbours during the works, the expert assesses the damage and quantifies the cost of repairs.
- Post-works value check: verify that the renovation has effectively increased the property’s value, particularly in the context of mortgage refinancing.
For a diagnostic survey or an expertise related to your construction or renovation project, contact our practice.
Summary
Building or renovating in the Brussels-Capital Region involves navigating a demanding but coherent regulatory framework, structured around three pillars: planning permission (urbanisme.brussels), EPC standards (Bruxelles Environnement), and financial support (Renolution grants, green loan). Costs are above the national average, but regional grants and the reduced 6% VAT rate for renovations of dwellings over 10 years old help offset part of the expense.
The Brussels building stock, largely composed of older buildings, offers considerable renovation potential. With the progressive renovation obligations imposed on energy-inefficient dwellings and the grants available, energy renovation is both a regulatory requirement and an opportunity to enhance asset value.
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