Renovating a house in Uccle: a step-by-step guide (permits, grants, contractors)

In a renovation, the order of your decisions matters. First understand the condition of the house, then check what the planning rules allow, cost and finance the work, choose who will carry it out, and follow the works through to handover. This guide gives that overview for a house in Uccle (Ukkel in Dutch). It also gives pointers that apply in the neighbouring municipalities (Forest, Ixelles, Watermael-Boitsfort), and each topic links to a detailed guide. It is based on the official pages of the Brussels-Capital Region, urban.brussels and the municipality of Uccle, read on 03-10-2026. Quotations from official sources are our translation from the French.

Key points

• In Brussels, all construction, demolition and alteration work, inside or outside, in principle requires a planning permit ("permis d'urbanisme") before it starts. An exemption is the exception (urban.brussels, as of 03-10-2026).
• Do not sign a quote on the strength of a grant: first check the status of financial support in the guide Rénolution grants.
• Even where no permit is needed, the regulations (electricity, gas, asbestos, heritage) still apply (renolution.brussels).
• Free advice is available: Homegrade, for tenants, owners and co-owners in the Region.
• If in doubt, put your question in writing to the municipality's planning department before you sign anything.

Where to start: three checks before any quote

The regional portal renolution.brussels sets out a path in four stages: getting started, preparing, following the works, and "afterwards". Before you ask for a single quote, three checks come up again and again on its pages.

1. Gather what is known about the building. Renolution recommends collecting the history of the building, old plans, quotes and wiring diagrams, the boiler service reports, and your energy and water bills. If you are buying, the municipality of Uccle explains that the planning information ("renseignements urbanistiques", article 275 of the CoBAT, the Brussels Spatial Planning Code; BWRO in Dutch) tells you which regulatory provisions, regional or municipal, apply to the property, and that it is essential for any deed of sale. Uccle states that the 2026 fee for requesting this information is €103.70.

2. Find out whether your project touches the planning rules. Renolution points out that "even if your works do not require a permit application, that does not mean you do not have to comply with the regulations". The sections below go into this.

3. Get free advice. According to renolution.brussels, Homegrade "advises and supports you free of charge on grants, energy, renovation, heritage, acoustics and planning", whether you are a tenant, owner or co-owner (phone numbers given: 1810 or +32 (0)2 219 40 60). The Réseau Habitat offers free advice in some municipalities: the page names Une Maison en Plus for Forest and SoHab for Ixelles; Uccle and Watermael-Boitsfort are not listed.

The steps at a glance

Survey the house before choosing the works

Renolution starts its path with an analysis of the property: "Your building has its own characteristics, its strengths and its weaknesses." To pin down the priority works, the portal suggests calling in an architect or a renovation adviser, and mentions Homegrade's advisers for a single-family house or a flat in co-ownership.

According to the page presenting the Renolution strategy, Brussels buildings are "old, and many of them are very poorly insulated, or not insulated at all", built "mainly before the 60s". That is a finding for the Region as a whole: the condition of your own house has to be checked on site.

Three topics have their own guide on this site:

• damp (rising damp, condensation, rain penetration, saltpetre): see Damp in a Brussels house and Saltpetre on walls;
• the roof: see Roofs in Uccle;
• windows and doors: see Windows in an old house.

Planning rules in Uccle: what to check before you order anything

The principle and its exceptions

In Brussels, a planning permit is the rule and an exemption is the exception: exempt works are set by the order of 13 November 2008, known as the "arrêté dispenses" (exemptions order), and are only exempt if the project complies with the plans and planning regulations (urban.brussels). For an ordinary renovation, the municipality of Uccle lists among the works that need a permit any change to the structure, volume or architectural appearance, changing the number of homes, insulating a facade visible from public space and replacing windows in a way that changes their appearance; it presents its list as non-exhaustive. The exemptions and their conditions, the project meeting, the planning certificate and the decision periods (for a permit decided by the municipal board, 75 to 160 days from the acknowledgement of receipt of the complete file, extended by 30 days if they end during the summer holidays) are set out in the guide Planning permits in Brussels.

Uccle's own rules

The municipality explains that planning rules on its territory come from two levels. At regional level: the PRDD (regional sustainable development plan), the RRU (regional planning regulations), the PRAS (regional land-use plan), the CoBAT, the exemptions order and the "RGB Bruxelles" (an acronym the municipality uses as is). At municipal level: subdivision permits, special land-use plans (PPAS), the municipal planning regulation (RCU) on water, the one on signs, the one on commercial activities, a zoned RCU for the "Grandes avenues", and Uccle's general building regulation, the "Règlement général des bâtisses" (1948).

The planning department is the place to ask which of these rules apply to your plot. Permit applications can also be looked up online on openpermits.brussels.

Protected or inventoried buildings

Uccle has many buildings that are listed ("classé") or on the safeguarding list (liste de sauvegarde), and the municipality stresses that permit applications for their renovation call for particular care. A building that is only included in the legal inventory is not, strictly speaking, protected, but a permit application for it is in principle submitted to the "commission de concertation" (consultation committee) for its opinion (patrimoine.brussels). Within 20 metres of a protected building, some exemptions, such as the one for facade colour, no longer apply, and putting up advertising or signs less than 20 metres from a listed building requires a permit (urban.brussels). To check the status of your house and what it changes, see Brussels character houses.

Financial support: check before you commit

Rénolution grants. As of 19 October 2026, be.brussels states that there is no government decision on any RENOLUTION grants for 2025 and/or 2026, and that no application can be submitted for final invoices dated 2025 or 2026. Do not build a budget on a grant that is not open: the guide Renovation grants in Brussels: what is left of Rénolution? gives the full picture and lists the support that is still available.

Other schemes exist, each with its own conditions, set out in the guide Rénolution grants:

• 6% VAT instead of 21% on certain works, subject to several cumulative conditions, including a home built more than 10 years ago and used exclusively or mainly as a private residence (be.brussels, which refers to the FPS Finance, "SPF Finances").
• ECORENO loan from the "Fonds du Logement" (Brussels housing fund), preferential-rate financing for all types of renovation work on a home in Brussels.
• Six Uccle municipal grants (solar water heater, rainwater tank, green roof, rainwater infiltration, natural pond, doors and windows); as the one for doors and windows is calculated on the regional Rénolution grants G1 and G2, ask the municipality how it applies if those regional grants are not open.

Choosing who does what: architect, contractor, quotes

The architect

According to urban.brussels, an architect is in principle required for all works that need a planning permit, except those that the order exempts from this requirement because they do not generally raise structural stability issues. Renolution adds that, where the stability of the building is not affected, a permit application can be made without an architect, and that if the project is subject to a planning permit, the architect must supervise the works. Architects authorised to practise must be registered with one of the two Orders of Architects (French- and German-speaking, or Dutch-speaking), whose official lists can be consulted online.

The contractor

Renolution lists the administrative checks: the firm must be registered with the BCE (Crossroads Bank for Enterprises, the Belgian company register) and have the "accès à la profession" (access to the profession) required for the regulated construction activities it carries out, and you can check on checkobligationderetenue.be that it has no social or tax debts. The portal points out that having no debts does not prove quality, and that signing the quote amounts to a contract: do not sign while you still have doubts. The guide Finding a reliable contractor in south Brussels covers these checks in detail.

Quotes and budget

Renolution advises you to describe the level of finish you want, to ask contractors to break down every item in their quote so that you can compare them, and to keep a safety margin for the unexpected. If a grant is open at the time of your works, ask for the quote to include the technical requirements it sets.

Other obligations not to forget

Renolution lists several obligations that apply to work on a house, whether or not a planning permit is needed:

• Electrical installations: the general regulation on electrical installations (RGIE) applies to installations put into service after 1 October 1981, with specific requirements for some older installations.
• Gas: when a meter is opened, the network operator inspects the installation; the installer provides a CERGA certificate, and a certificate of compliance is also required when an installation is modified or newly installed.
• Asbestos: banned today, it is still present in many buildings; asbestos removal or encapsulation work may require a declaration or an environmental permit ("permis d'environnement"), and asbestos remains hazardous waste that must be removed following a set protocol.
• EPB requirements for works: according to urban.brussels, the energy performance requirements apply to many projects that need a permit; when an architect is involved, the municipality of Uccle states that all the forms are generated by the EPB software.

The works, handover and afterwards

Before the works start

A permit that has been granted cannot be acted on straight away. According to urban.brussels, for a permit issued by the municipal board, you must wait 20 days from the date the municipality sends a copy of the permit to the fonctionnaire délégué, a period during which the official can review it. The permit holder must then inform the public and the authorities no later than 8 days before the start: display a notice on site setting out the main details of the permit, and send a registered letter to the municipal board and to the fonctionnaire délégué. Failing to meet these obligations is a planning offence. Uccle provides template notices, including a notice of completion of works to be sent by registered letter to the municipal board.

The permit also lapses if work has not significantly begun within three years of its notification, or if the works are interrupted for more than a year (article 101 of the CoBAT, according to urban.brussels); the conditions for an extension are in the guide Planning permits in Brussels.

During the works and at handover

Renolution refers to Homegrade's brochure "Maîtriser son chantier" (managing your building project) to prepare for supervising the works. Acceptance of the works (handover) is a meeting at which the client who commissioned them assesses whether the contractor has carried out the work in line with the contract, the technical documents supplied (plans, specifications, technical data sheets) and good building practice.

After the works

If a grant is open, Renolution notes that the application requires specific documents, including the contractor's certificate and the detailed invoice. If any of the works listed on your EPB certificate has been carried out, you can have the certificate reassessed by an EPB assessor. Some inspections and maintenance remain compulsory, notably for a heating system.

The risk of works without a permit

According to urban.brussels, working without the required permit is a criminal planning offence (article 300 of the CoBAT), and paying an administrative fine does not regularise the situation: the site must be restored to its previous state or a regularisation permit obtained. The details are in the guide Planning permits in Brussels.

Frequently asked questions

Do I always need a permit to renovate a house in Uccle?

No, but that is the principle: according to urban.brussels, exemption is the exception. Some works are exempt, for example interior alterations with no structural work, no change in the number of homes and no change of use, or replacing windows while keeping their original shapes; the list and its conditions are in the guide Planning permits in Brussels. Before you order any work, ask the planning department whether your project falls under an exemption.

Can I start as soon as the permit is granted?

No. There is a short period during which the permit cannot yet be acted on (20 days for a permit issued by the municipal board, according to urban.brussels). After that, you must display the notice and inform the municipal board and the fonctionnaire délégué by registered letter no later than 8 days before the start.

Do the Rénolution grants still exist?

Rénolution grants. As of 19 October 2026, be.brussels states that there is no government decision on any RENOLUTION grants for 2025 and/or 2026, and that no application can be submitted for final invoices dated 2025 or 2026. Do not build a budget on a grant that is not open: the guide Renovation grants in Brussels: what is left of Rénolution? gives the full picture and lists the support that is still available.

Who can give me free advice?

According to renolution.brussels, Homegrade advises tenants, owners and co-owners free of charge. The Réseau Habitat works in some municipalities, including Forest and Ixelles according to the Renolution page. For the permit procedure in Uccle, the planning department sees people by appointment.

Who do I contact in Uccle with a planning question?

The municipality's planning department (rue de Stalle 77, 1180 Uccle), open by appointment only, Monday to Friday from 8:00 to 16:00; the email address given by the municipality is info.urbanisme@uccle.brussels. For the other municipalities, see Uccle, Forest, Watermael-Boitsfort: what is specific to each municipality.

On 03-10-2026 the editorial team reread the official pages of renolution.brussels, urban.brussels (urbanisme.irisnet.be and patrimoine.brussels), be.brussels, Homegrade and the municipality of Uccle cited above. Statuses, thresholds and procedures change: check with your municipality's planning department, renolution.brussels or Homegrade before deciding on any works. This guide is not legal advice.