
Property, made simple.
Since 2011
J&J helps property owners unlock the full potential of their properties
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A single partner to unlock the potential of your property
J&J is far more than an estate agency.
Since 2011, we have supported property owners and investors with a simple conviction: the best property decisions are those made within an overall vision.
Because a property is not simply a transaction, we have developed the Investor Cycle: a holistic approach that connects investment, optimisation, rental, management and sale in order to create greater long-term value.

The investor cycle
Invest
Search, identify and acquire the best opportunities
For whom
Investors, entrepreneurs and wealth-minded profiles who wish to grow their property portfolio without managing the operational complexity.
Our promise
Build a coherent and high-performing property investment strategy across the entire property cycle.
In practice
Targeted search, financial analysis, project structuring, acquisition support, value enhancement and integrated exit strategy.
Optimise
Maximise the value of your property
For whom
Owners and investors who wish to audit, improve the performance, value or clarity of their existing portfolio.
Our promise
Unlock the full potential of your property portfolio.
In practice
Global audit of your property portfolio, strategic recommendations, rental optimisation, renovation plan, restructuring or repositioning of assets.
Rent
Find the best tenants
For whom
Owners wishing to let quickly and efficiently whilst securing an optimal rental income.
Our promise
Maximise and secure your rental income.
In practice
Rental valuation, property presentation, targeted marketing, rigorous tenant selection and lease management.
Manage
Simplify day-to-day management
For whom
Owners who wish to hand over the day-to-day management of their properties with complete confidence.
Our promise
Serene, transparent and professional management.
In practice
Administrative, financial and technical management. Tenant monitoring, coordination of interventions and clear reporting.
Sell
Achieve the best return on your investment
For whom
Owners and investors looking to arbitrate, dispose of or restructure their portfolio.
Our promise
Sell at the right time, with a clear and well-considered strategy.
In practice
Timing analysis, property valuation, sales strategy, and support through to and after the signing of the deed.
What you gain with J&J
More time
We handle the formalities, monitoring and coordination.
Greater peace of mind
A single point of contact looking after your interests.
Greater visibility
A clear view of your portfolio.
Greater value
Coherent decisions at every stage.
Greater simplicity
All property services united under one roof.

What if your property could reveal its full potential?
Let's discuss your objectives and discover together how to unlock the full potential of your property.
The team
What our clients say about us
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Online valuation
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Browse the most frequently asked questions.
In Belgium, residential properties (city-centre flats, suburban houses) remain attractive for their stable rental demand. Student residences and co-living properties also offer high yields. Profitability depends above all on location, property quality and the rental amount relative to the purchase price. Dynamic areas (Brussels, Liège, Namur, etc.) or well-connected neighbourhoods with strong rental demand are often recommended.
You no longer wish to chase files, tradespeople, banks or tenants.
You may send us a complete file via our online form or by email. We recommend gathering all supporting documents quickly (identity document, payslips, etc.) so as not to miss a viewing. Once your file has been submitted, our team will review it and contact you to register you as a candidate for the property. We manage viewings on the basis of these prior applications.
On average, a property sale in Belgium takes several months. According to recent studies, the total timeframe (from listing to signing at the notary's office) is approximately 3 to 8 months. A 'fast-track scenario' (cash buyer) can complete the sale in 3–4 months, whilst a standard sale (with a conditional mortgage) typically takes 5–8 months. These timeframes include preparation of the file (EPC certificates, electrical inspection, etc.), the viewing and offer phase, and notarial formalities.
Divide the gross annual rent by the purchase price and multiply by 100 to obtain a percentage. For example, a property worth €200,000 rented at €1,000/month yields approximately 6% gross yield. In practice, this is also compared against the 'reference rents' for the region (official tools in Brussels/Wallonia) to set a competitive rental level.
Specialists agree that spring and autumn are the most favourable seasons for a sale. In spring, the light and pleasant weather attract more motivated buyers, and viewings and transactions peak. Autumn, being less competitive (fewer new properties on the market), is also favourable. Summer and winter can be slower, but a well-presented property (a blooming garden in summer, a warm interior in winter) helps to convince buyers.
Belgian law limits the documents that may be requested. In practice, you should prepare: an identity document, proof of income (payslips, tax assessment notice or bank statements) and rental references (attestation from the previous landlord if possible). In accordance with the regulations, the landlord may only request information relating to your identity, your contact details and your financial resources (and not the specific nature of your income)
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We produce estimates based on plans or comparative quotes. In Belgium, a per-square-metre rate is generally applied (depending on the type of work). Thanks to our network of architects and tradespeople, we can quickly provide a detailed breakdown of any planned renovation costs.
Our commissions are free and negotiable. In Belgium, they generally range between 2% and 5% (excl. VAT) of the sale price. In accordance with Belgian practice, these fees are typically borne by the seller. The details (exact rate, VAT, etc.) are set out in the sale mandate we sign with you.
To select a reliable tenant, we focus primarily on solvency and rental history: stable income (ideally ≥3 times the monthly rent), a permanent contract or secure employment situation, no negative credit file, and all previous rent paid on time. We also check for any disputes (payment incidents) via public records. Criteria are applied fairly, without unlawful discrimination and in compliance with privacy regulations (we will not ask for your health status or criminal record)
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It is advisable to obtain at least a bank pre-approval (letter of intent to lend) before beginning your search. This reassures sellers and focuses your search on a realistic price range. That said, you may explore the market first and confirm your financing at a later stage.
Our fee covers the full scope of the service: expert property valuation, preparation of mandatory documents (EPC certificate, electrical inspection, etc.), professional photography, advertising on the main portals (Immoweb, Zimmo, immovlan, etc.) and on our website, organisation of viewings, negotiation of offers and support through to signing at the notary's office. In short, no hidden fees: everything is included in the mandate and explained transparently.
The so-called 'main residence' lease follows the default rule of 9 years. There is also the short-term lease (≤ 3 years) and the student lease (12 months). Under a standard 9-year lease, the tenant may give notice with 3 months' notice at any time (every 3 years), whilst the landlord must give 6 months' notice if they wish to recover the property before the end of the term. Under a 3-year lease, the notice period is 3 months for either party. These arrangements are set out in detail in housing legislation.
You can start investing from as little as €100,000–150,000 (e.g. a studio flat in the city). The main constraint is borrowing capacity: as a rule, you need at least 20–30% of your own funds to cover the deposit and associated costs (6–7% of the purchase price). We help you tailor the project to your budget and your objectives (expected rental income, capital gain, etc.).
No. Everything is clear from the outset: we charge only our agreed commission (see above) and the applicable VAT. No hidden fees are levied.
The lease is drawn up in the administrative language of the region: in Wallonia, it is drafted in French. In Brussels, it may be in French or Dutch depending on the preference of the landlord and tenant, or even bilingual. We generally provide the lease in French for our French-speaking clients, with a Dutch version available upon request if required.
Yes: we offer a 'property finder' service. We define your criteria together (areas, property type, target yield) and alert you promptly as soon as a matching property becomes available. This includes sourcing across all portals and through our network of agencies, even in areas where you do not reside.
Your property will be listed on all the major Belgian property portals (such as Immoweb, Zimmo, Vlan, etc.), on our own website and on our social media channels. This maximises visibility. We also ensure the use of relevant keywords (e.g. 'apartment Brussels for sale') to optimise SEO, so that targeted buyers can find your listing online.
This depends on local demand and the asking price. A flat correctly priced and in good condition can find a tenant within a matter of weeks. In practice, from the date of publication, allow generally 2 to 6 weeks to finalise a rental. We optimise the listing and viewings in order to minimise vacancy periods as much as possible.
You need a clear vision and comprehensive support to navigate the legal, fiscal and technical aspects.
Absolutely. Our management team can coordinate works (from minor repairs to major renovations) through our network of reliable Belgian contractors. For any job exceeding a certain amount (for example €150), we obtain your written approval before proceeding.
Yes. We work with home staging partners and provide presentation advice (decluttering, styling, garden upkeep). A well-presented and well-photographed interior attracts more buyers. We can arrange a light home staging session before the photo shoot, or simply guide you on small improvements (fresh paint, minor repairs, etc.) that enhance the property's appeal.
You wish to benefit from privileged access to off-market properties and opportunities reserved for our clients.
Once the lease has been signed and the deposit plus first month's rent paid (via rental guarantee), you may move in on the possession date stated in the contract (often the 1st of the month following the signing). We agree together on a date for the entry inspection and handover of keys, generally shortly after the lease is signed.
Yes. Our rental management services cover tenant sourcing, lease signing, rent collection and day-to-day administration. Standard management fees range between 5% and 10% of rents received. We also prepare service charge statements, ensure compliance with tenant obligations and intervene in the event of a dispute (unpaid rent, damage, etc.).
The sale proceeds in three key stages. First, prior to listing, we value the property and prepare the file (mandate, mandatory surveys). Then, during the marketing phase, we manage advertising and viewings. When we receive a serious offer, we assess its soundness (credit capacity) and organise the signing of the preliminary sale agreement (often at the notary's office or at the agency). After any mortgage condition is lifted (4–6 weeks if the buyer requires finance), the notary carries out the legal formalities (planning checks, mortgages, etc.) over 1–2 months before setting the date for final signing. At that point, the buyer pays the price and you sign the authentic deed. This process is described in detail on our blog.
'Under option' means that a potential buyer (or tenant) has signed a purchase or rental option agreement. During the option period, the property is withdrawn from the market and reserved for that person. The seller undertakes not to consider other offers. In practical terms, the option gives you an agreed period (determined between the parties) to finalise your decision. If you exercise the option before it expires, the sale (or rental) becomes binding.
There is no strict lower limit, but a profitable investment typically requires several tens of thousands of euros. For instance, a small flat in Brussels can be found from around €150,000–200,000. We can advise you on opportunities suited to your budget through our valuation tools and market analyses.
The notary is an indispensable public officer: Belgian law requires them to draft the authentic deed of sale in order to make the transaction enforceable against all parties. The notary verifies the title to the property and any easements, drafts the final deed, collects the price and the registration duties, and officially records the sale. Through the notary, the buyer becomes the legal owner and the transaction is secured legally. In short, the notary guarantees the validity of the sale and ensures the transfer of ownership (mortgage registration).
The audit is a comprehensive review of your existing properties: rental income, taxation, risks and profitability. It is particularly useful if you own several properties or are considering a change of strategy (sale of certain properties, renegotiation of loans, etc.). The cost varies according to the complexity of the file (generally a fixed fee). We provide a clear report to help you optimise your portfolio.
On our website, each property generally has a viewing appointment tool. You may select the date and time that suits you. To modify or cancel, simply notify us by phone or email (at least 24 hours in advance).
A complete file must be compiled in order to inspire confidence. Mandatory documents include:
- EPC Certificate (Energy Performance Certificate): required before the listing can be published
- Electrical inspection certificate (compliance report)
- Fuel oil tank certificate (if you have a tank >3,000 L)
- Planning information: land registry extract, any planning permits, regularisations to be carried out
- Asbestos-free certificate (for older buildings, regulations currently in force)
- Co-ownership documents (minutes of general meetings, reserve fund, service charge statement) if selling a flat
- Sewerage connection (in certain municipalities) and soil certificate for specific plots of land
In short, a clear file (EPC, title deed, surveys, co-ownership information, etc.) reassures the buyer and speeds up the sale.
We help you gather all these documents in advance.
If you have saved criteria on our website (for example in your 'My Account' area), you may add or remove criteria at any time (budget, geographical area, property type, etc.). This allows us to notify you automatically of new listings matching your preferences. You may also send us your new priorities directly by email; we will update your profile in our database.
Yes. We can assist you with planning permission procedures if your project requires it (extension, major renovation), and guide you on regional tax incentives (energy grants, depreciation allowances, etc.). We work alongside legal and accounting professionals specialising in property.
Of course. Many foreign investors are active in Belgium. We facilitate remote communication (video calls, online documents) and a local representative can act on your behalf for viewings and formalities. Belgian regulations do not require residency in order to buy or rent a property.
























