How to renovate your bathroom without making mistakes?

First of all: assessing the existing situation to avoid unpleasant surprises

Bathroom renovation begins well before the first hammer blow. It begins with a clear-eyed assessment of what already exists: the condition of the plumbing, the current electrical installation, the ventilation system, any potential damp in the walls. These elements, invisible to the naked eye, determine which works are mandatory and therefore a significant part of your real budget.

The plumbing: the first thing to check

Pipework more than 30 years old (lead, galvanised steel) will often need to be replaced. This is an ideal opportunity not to be missed during a renovation. Also check the drainage falls: they must comply with 1 to 2 cm per metre for correct flow, otherwise chronic blockages will follow. This is also the time to reposition a drain or plan ahead for a walk-in shower. Moving a pipe during the works costs two to three times more than planning for it at the design stage.

The electrical installation: the RGIE 2025 standards you need to know

The RGIE (General Regulation on Electrical Installations) was thoroughly revised on 1 March 2025. The requirements for bathrooms are strict and non-negotiable: a differential circuit breaker of ≤ 30 mA mandatory for all circuits, an equipotential bonding connection linking all conductive elements (pipework, bath, shower), Class II wiring only in wet zones.

Sockets are prohibited in zones 0 and 1 (in and around the shower/bath). In zone 2, they are permitted only with a differential of ≤ 10 mA. To remember: any electrical work in a bathroom must be inspected by an approved body — this is a legal obligation, not an option.

💡 Good to know: If your home is more than 25 years old and has never had its electrical installation brought up to standard, always budget for an 'RGIE compliance' item. This is often where unexpected overruns are hidden.

Ventilation: the important point in Belgium

The Belgian standard NBN D 50-001 requires a minimum air extraction rate of 50 m³/h for a residential bathroom. In practice, this means that any renovation is the ideal opportunity (often mandatory depending on the municipality) to check or install a mechanical ventilation system (VMC). Insufficient ventilation generates damp, mould, and ultimately damages the finishes and structure. It is also the most common cause of non-compliance during an EPC inspection.

Damp: treat before covering

Covering a damp problem with new tiling is the most classic and most costly mistake in the long term. If rising damp, mould or paint blistering is visible, it must be treated thoroughly before any surface finish is applied. A professional can carry out a rapid diagnosis during an initial visit.

Partial or full renovation: how to decide?

This is often the first question that causes hesitation. Just replace the unit and taps? Redo everything? The answer depends on two key factors: the structural condition of your current bathroom, and the timeframe before the next renovation.

The 5 steps to a successful bathroom renovation project

A well-managed bathroom project always follows the same logical sequence. Departing from this sequence — for example, choosing equipment before confirming the plumbing layout — is the main source of complications and cost overruns.

Step 1: design before you choose

Design is much more than drawing a plan. It is the phase where the positioning of water supply points, drains, electrical sockets, and ventilation outlets is decided. These are all technical constraints that determine everything that follows. This is also the moment to clarify your priorities: do you need a double basin? A larger shower? Optimised storage space?

Designing your renovation project with an expert adviser (not alone with Pinterest photos) is a considerable saving in time and money. Facq advisers at the EXPOcenter are familiar with Belgian configurations: terraced houses, apartments with existing floor levels, loft conversions, windowless bathrooms.

Step 2: choose your equipment in the right order

Once the plan has been approved, choices follow in a specific order: (1) the shower or bath — the centrepiece that determines the layout of the space, (2) the vanity unit — based on the available width and storage requirements, (3) the WC — wall-hung or floor-standing depending on the load-bearing wall configuration, (4) the taps — in a finish that matches the accessories, (5) the lighting — often considered last, when in fact it determines the entire atmosphere.

The classic mistake is to choose in a haphazard order (an impulse mirror here, discounted taps there) only to end up with inconsistent finishes that let the whole thing down. Consistency of finish is what distinguishes a successful bathroom from an assembled one.

Step 3: find the right installer

This is often the most anxiety-inducing step. A competent Belgian bathroom installer must master three trades: plumbing, electrics (or subcontract to an approved electrician), and tiling. Finding someone who coordinates all three aspects, who knows the products you have chosen and who meets deadlines: that is rare and valuable.

The objective criteria to check: qualification certificate (electrical competency certificate for works in wet zones), references from similar projects, and ten-year professional liability insurance cover. Always request 3 quotes: not to choose the cheapest, but to understand what is included or not in each offer.

Step 4: managing the building works calmly

A complete bathroom renovation project generally takes 1 to 3 weeks, depending on the surface area and complexity of the works. The order of work is always the same: demolition and removal of rubble, plumbing (supply and drainage), electrics (RGIE compliance), waterproofing (mandatory membrane for walk-in showers), finishes (floor then walls), installation of sanitaryware, taps and lighting, finishing touches and handover.

Always allow a contingency of 10 to 15% on your budget for unforeseen costs. Particularly in older properties (> 30 years) where every wall opened up can reveal surprises. This contingency is not pessimism: it is wisdom.

Bathroom renovation does not require planning permission in any of the three Belgian regions, as long as there is no modification to the stability, volume or external appearance of the building. No prior declaration is required for interior bathroom works.

Grants and reduced VAT: what is available in Belgium in 2026

The landscape of financial assistance for renovation is undergoing profound change in 2025–2026. Before counting on a grant, it is essential to check the situation in your region: the rules have changed in all three regions this year.

6% VAT: the benefit available to everyone

This is the most universal and straightforward financial benefit to obtain. For homes more than 10 years old, the VAT applicable to bathroom renovation works — materials and labour included — is reduced to 6% instead of 21%. On works of €10,000 excluding VAT, the saving reaches €1,500 — equivalent to a quality vanity unit.

Essential condition: the works must be invoiced by a professional contractor (not materials purchased directly by the homeowner). This is one of the reasons why working with a qualified installer is not only a guarantee of quality: it is also a direct tax benefit.

The WC: a structural choice that is often underestimated

The WC is often the last element considered in a bathroom project, when in fact it is one of the first elements on which the load-bearing wall configuration, the electrical installation (for Japanese toilets) and the positioning of other equipment depend. A particular point of attention for Belgian renovation projects.

Wall-hung WC vs floor-standing WC: the real comparison

The wall-hung WC is today the benchmark in ambitious renovation projects. It frees up the floor, makes maintenance easier (no base to clean), allows the seat height to be adjusted between 38 and 58 cm, and creates a very clean visual line. Its installation requires a load-bearing wall or a mounting frame (such as the Geberit Duofix system) that is sufficiently robust. This represents more masonry work than a floor-standing WC.

The floor-standing WC remains relevant in partial renovations where the wall cannot accommodate a mounting frame, or for tighter budgets. Current models (Duravit, Villeroy & Boch) have evolved considerably in terms of design. Some come close visually to the look of a wall-hung WC with very elongated profiles and integrated cisterns.

The Geberit wall-mounted flush system: why it has become a standard

The wall-mounted flush system (mounting frame + concealed cistern) offered by Geberit has established itself as the standard for the contemporary Belgian bathroom. The main reason: it allows water consumption to be reduced to 3/6 litres (compared to 6/9 litres for a traditional surface-mounted cistern), while creating that clean look with no visible cistern. The flush plate — the last visible element — is available in multiple finishes to match the chosen taps.

Japanese toilets with integrated bidet: suitable for the Belgian market?

Japanese toilets (or washlet toilets) are making a notable entry onto the Belgian market. Their main argument: superior hygiene at a limited water cost, and the absence of toilet paper — an environmental and economic argument that is increasingly resonant. Recent models from Duravit, Geberit or Villeroy & Boch are compatible with Belgian electrical installations (RGIE 2025) and integrate into any contemporary bathroom project.

A point of attention: they require an electrical socket in zone 2 (at least 60 cm from the outer edge of the WC), which must be planned from the design phase. A point that is often overlooked and that forces the wall to be reopened later.

The accessible bathroom: plan ahead rather than adapt later

Designing an accessible bathroom from the outset is one of the smartest decisions in a renovation project. A level-access walk-in shower is already an accessible bathroom in its basic configuration. Adding a discreet brushed stainless steel grab rail, allowing for a turning space of 150 × 150 cm and a WC at 45–50 cm height: these minor adjustments at design stage represent a very small additional cost compared to future adaptation works.

The role of the installer: why this choice is decisive

A bathroom project can be perfectly designed, with quality equipment, and still deliver a disappointing result if the installation is poorly executed. Badly applied joints, a pipe with a slightly incorrect fall, tiling with a forgotten expansion joint: these execution details are invisible at the handover and reveal themselves in the 12 to 24 months that follow.

What a good bathroom installer must master

• Plumbing: compliance with drainage falls, choice of appropriate materials (PEX, copper, multilayer), mastery of waterproofing techniques for wet zones.
• Electrics: knowledge of RGIE 2025, coordination with an approved electrician if required, mandatory inspection by an approved body at handover.
• Tiling: substrate preparation, decoupling systems to prevent cracking, epoxy grout in permanently wet zones.
• Coordination: ability to orchestrate the different trades in the right order, without unnecessary downtime that extends the duration of the works.

What to check before signing

• Qualification certificate for electrical works in wet zones.
• Professional liability insurance and, for structural works, ten-year structural warranty insurance.
• References from similar projects: ask for before/after photos and, if possible, client contact details.
• Detailed quote with a breakdown by item: not a lump sum.

The 7 mistakes that derail a renovation project

These mistakes are identified from feedback from Facq advisers at the EXPOcenter and the most common complaints in Belgian renovation projects. Avoiding them is straightforward: they are almost all the result of a lack of forward planning.

1. Choosing products before confirming the plan. The taps you fell in love with may be incompatible with your plumbing configuration. Always design first.
2. Underestimating mandatory technical works. Electrical compliance, ventilation, shower waterproofing: these non-visible items often represent 30 to 40% of the total budget.
3. Only requesting a single quote. Without a point of comparison, it is impossible to know whether a price is reasonable — and what is or is not included.
4. Forgetting to plan electrical sockets for Japanese toilets or electric towel rails. Reopening a tiled wall is expensive and damages the final result.
5. Treating the tiling and not the damp. Covering a damp problem is a short-term solution. It will reappear — and often worse than before.
6. Not requesting a formal handover with written record. Reservations expressed verbally have no legal value. Document everything in writing, with photos.
7. Forgetting to check eligibility for 6% VAT before signing. Once the works have been invoiced, it is too late to change the rate applied.