
You invest. We manage.
Since 2011, J&J has been making investors’ lives easier and optimising their property portfolios.
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Property management built to protect your investment
Effective management is not simply about administering a property. It aims to preserve its value, optimise its returns and free you from day-to-day constraints, so that your portfolio continues to create value over time.
Since 2011, we have supported owners and investors in managing their properties in Brussels and Walloon Brabant.
More than 650 properties are entrusted to us every day.

What you get
An integrated service that protects your property, simplifies your daily life and maximises your rental income.

A proactive point of contact and personalised support at every stage
More than 700 properties managed in Brussels and Walloon Brabant. We know your market inside out
Tenant search, administration, technical follow-up, accounting and legal support
We anticipate problems before they affect your property or rental income
Regular reporting, access to your 'My J&J' landlord portal and complete visibility over the management of your property portfolio

How does property management work with J&J?
Onboarding
We analyse your personal circumstances, your property and your objectives in order to establish a clear and structured property management service.
This stage includes taking over the administrative and technical information, checking legal obligations, signing the management mandate, and liaising with the existing tenant or preparing the property for letting.

Day-to-day management
J&J handles the day-to-day management of your property and relations with tenants. We take care of monitoring rent and invoices, issuing any necessary reminders and applying indexation, handling tenant requests, administrative follow-up and coordinating technical work.
You also have access to your My J&J portal, where you can view your documents, finances and management history.

Continuity of occupancy
If a tenant leaves, we prepare to re-rent the property in advance to avoid rental void periods. Our rentals team, which completes more than 200 rentings each year, takes care of finding a suitable new tenant.

Ongoing monitoring and optimisation
We adapt the management of your property over time to maintain its consistency and performance while remaining aligned with your objectives. This includes indexing rents to keep them in line with market rates, recommendations to improve the property's appeal, and guidance on important decisions relating to your property investment.





Choose J&J if you need:
More time
Focus on your plans while we manage the day-to-day details.
Greater peace of mind
A dedicated team looks after your property portfolio.
Greater security
Rents monitored rigorously. Payment tracking, reminders, proactive management of arrears and support in the event of difficulties.
Greater value
A well-maintained property retains its appeal! We coordinate technical work and ensure your investment is properly maintained.
Less risk
Support that complies with legal obligations. Regulations evolve. Tenancy agreements, indexation, legal obligations and administrative procedures are managed by our teams.
Greater visibility
All information centralised in your 'My J&J' portal. Your My J&J landlord portal allows you to monitor your property with complete transparency.
Clear fees, with no surprises
Tailor-made
Every property portfolio is unique. Let us discuss your needs to create your package and provide a tailored quote.

Not sure J&J is the right fit?
Let’s talk! Book an initial, no-obligation consultation so that we can understand your needs and present our approach.
Because property management goes far beyond day-to-day matters, we have developed the "Investor Cycle": a comprehensive approach linking investment, optimisation, renting out, management and sale to sustainably grow the value of your property portfolio.
The investor cycle
Invest
Search for, identify and acquire the best opportunities
Who is it for?
Investors, entrepreneurs and wealth-focused clients looking to grow their property portfolios without managing the operational complexities.
Our promise
To build a coherent, high-performing property investment strategy across the entire property cycle.
In practice
Targeted searches, financial analysis, project structuring, acquisition support, value enhancement and an integrated exit strategy.
Optimise
Maximise the value of your property
Who is it for?
Property owners and investors wishing to assess and improve the performance, value or clarity of their existing portfolio.
Our promise
To unlock the full potential of your property portfolio.
In practice
A comprehensive review of your property portfolio, strategic recommendations, rental optimisation, a renovation plan, and the restructuring or repositioning of assets.
Rent out
Find the best tenants
Who is it for?
Property owners seeking to rent out quickly and efficiently while securing an optimal rent.
Our promise
To maximise and safeguard your rental income.
In practice
Rental valuation, property presentation, targeted marketing, rigorous tenant selection and contract preparation.
Manage
Simplify day-to-day management
Who is it for?
Property owners wishing to confidently hand over the day-to-day management of their properties.
Our promise
Hassle-free, transparent and professional management.
In practice
Administrative, financial and technical management. Tenant support, coordination of works and clear reporting.
Sell
Achieve the best capital gain
Who is it for?
Property owners and investors wishing to review, sell or restructure their portfolios.
Our promise
To sell at the right time, with a clear and confident strategy.
In practice
Timing analysis, property valuation, sales strategy and support through to and after completion of the deed.
The Property Management team
Discover our guides and tools

Value your property
Discover the value of your property in just a few clicks
View the most frequently asked questions.
Our fees depend on the level of service required and the number of properties you entrust to us.
We offer a range of packages to tailor our support to your needs, from administrative monitoring to comprehensive management covering rental, technical and financial matters in particular.
To find out the cost of our management service based on your circumstances, you can use the calculator available on our ‘Property management’ page. In just a few clicks, you will receive an estimate tailored to your property or property portfolio.
Yes. Whether you own one flat, several properties, investment properties or an entire property portfolio, we tailor our service to your circumstances.
Our packages are designed to evolve with your portfolio and allow you to centralise all your property management with a single partner: administrative and financial monitoring, tenant relations, technical management and coordination of the various parties involved.
This centralisation also gives you a clearer view of your portfolio’s overall performance and allows us to identify potential areas for optimisation more easily: rent adjustments, works to consider, the performance of certain assets and opportunities to rebalance your portfolio.
The aim is to provide you with both effective day-to-day management and a longer-term view of your property portfolio.
A rental management service handles all administrative, financial and technical matters relating to your property.
At J&J Management, our services include monitoring rent payments, rent indexation, tenant relations, managing technical interventions, inventories and condition reports, and the property's administrative management.
We become your tenants' day-to-day point of contact and manage the various situations that may arise throughout the tenancy, while consulting you whenever your decision is required.
Our objective is simple: to allow you to enjoy your investment without the constraints of day-to-day management, while retaining control over important decisions.
You retain control over important decisions and expenditure relating to your property.
When setting up the management service, we agree an amount below which J&J Management may arrange routine work without requesting your approval each time. This enables us to respond promptly to minor day-to-day work while avoiding contacting you unnecessarily.
Above this amount, or where work requires a specific choice, we consult you before incurring the expense.
Naturally, every expense incurred by our teams is in the interests of the investor and their property. We ensure that the work and associated costs can be justified where necessary.
The aim is simple: to free you from day-to-day management while leaving you in control of the decisions that matter.
Tenant selection is one of the most important steps in successfully letting a property.
At J&J Properties, we assess each application based on several factors: the applicant’s employment and financial circumstances, income, stability and the overall consistency of their application. We also verify the necessary supporting documents to assess their solvency and the reliability of their application.
However, a strong application is not simply about figures. Our teams also communicate with applicants throughout the process to assess their seriousness and the overall quality of their application.
Tenant selection is one of the most important steps in successfully letting a property.
At J&J Properties, we assess each application based on several factors: the applicant’s employment and financial circumstances, income, stability and the overall consistency of their application. We also verify the necessary supporting documents to assess their solvency and the reliability of their application.
However, a strong application is not simply about figures. Our teams also communicate with applicants throughout the process to assess their seriousness and the overall quality of their application.
Our aim is not simply to find a tenant quickly, but to select a reliable and solvent applicant with whom a long-term tenancy relationship can be established.
The final choice of tenant always remains yours.
Our aim is to free you from the day-to-day management of your property without ever disconnecting you from your investment.
You receive detailed monthly reporting and have permanent access to your My J&J account, allowing you to keep track of information relating to the management of your property.
On a day-to-day basis, our teams handle communications with tenants, technical work and administrative and financial monitoring. We inform you whenever a situation requires your attention, approval or decision.
You also have a dedicated property manager who is available by email or telephone to answer your questions and update you on any particular situation.
You therefore remain informed about what matters while being freed from day-to-day procedures and demands.
J&J Management operates primarily in Brussels, Walloon Brabant and the outskirts of Brussels.
This geographical focus allows us to maintain in-depth knowledge of local markets, rent levels and their specific characteristics, as well as a network of service providers capable of working efficiently on the properties we manage.
We assist owners of flats and houses, as well as investors with investment properties or larger property portfolios.
For properties located outside these areas, please feel free to contact us: depending on the location and nature of the portfolio, we can consider how we may assist you.
No. Our role is specifically to free you from the demands associated with your property investment.
Your dedicated property manager handles tenant requests, administrative matters, financial monitoring and the coordination of any technical work.
You naturally remain the owner and decision-maker for your property. We keep you informed and consult you whenever a situation requires your attention or approval, particularly for important decisions.
Thanks to your monthly report and My J&J account, you also retain a clear overview of your property’s management without having to be involved on a day-to-day basis.
The aim is simple: you remain informed and retain control over what matters, while we take care of the rest.
In most cases, yes. Property management obviously comes at a cost, but this should be considered in light of the value that professional management adds to your investment.
Good management can, in particular, reduce void periods, ensure payments are properly monitored, optimise and correctly index rents, anticipate certain issues and efficiently coordinate technical work. It also helps preserve the value of your property over the long term.
It also saves the owner a considerable amount of time and helps avoid administrative or legal errors that can sometimes have significant financial consequences.
At J&J Management, our role is therefore not limited to handling tenants' requests. We ensure that your investment performs well and increases in value over time.
The true calculation is therefore not simply a matter of comparing management fees with the rent received, but of assessing what professional management delivers in terms of performance, time saved, risk control and peace of mind.
Reducing rental voids depends above all on planning ahead, setting the rent at the right level and marketing the property effectively.
Through our J&J Properties brokerage service, we provide professional marketing: high-quality photographs, virtual tours, targeted publication of listings, organisation of viewings and careful vetting of prospective tenants.
When a tenant gives notice, our management and lettings teams work together to prepare for remarketing as early as possible and reduce the period between tenancies.
However, our aim is not to let at any cost: we seek the right balance between speed of letting, rent level and applicant quality, prioritising reliable and financially sound tenants.
With more than 200 lettings completed each year, our team has practical knowledge of the rental market and the experience required to position and market your property effectively.
Yes. As part of our rental management service, we handle tenants' technical requests and coordinate the necessary interventions.
When a problem arises, our team assesses the situation, determines responsibility and arranges repairs with the appropriate professionals. We also handle any insurance claims and coordinate the various parties involved.
For routine interventions, we can act directly within the limits agreed at the start of our collaboration. For more significant expenditure or works requiring a decision, we consult you before commissioning the work.
We can also oversee more substantial works and coordinate the various contractors. Periodic property inspections are also arranged to check its state of repair and, where possible, identify issues before they become more serious.
The aim is to preserve your property over the long term and spare you the day-to-day management of technical issues, while allowing you to retain control over important decisions.
Yes. However, the arrangements depend on the contract with your current property manager, particularly the duration of the management agreement and any termination conditions.
If you wish to join J&J Management, we can assist you with transferring the management of your property and arrange the transition with your current property manager.
We ensure that all necessary information is obtained: tenancy agreements, administrative documents, tenancy information, rent records, statements and technical files.
Our aim is to ensure a simple, seamless transition with no interruption to the management of your property, for both you and your tenants.
Yes. Your property does not need to be vacant for us to begin managing it.
We can readily take over the management of an existing tenancy. We obtain and review the necessary documents, such as the tenancy agreement, inventory and condition report, rental deposit, administrative information and other relevant items, to ensure continuity of management.
We then take responsibility for tenant relations, monitoring rent payments and indexation, administrative and financial matters, and any technical requests.
Our aim is to ensure a seamless transition without interruption, for both you and the existing tenant.
Our remit covers every aspect of the day-to-day management of your property: monitoring rents and payments, indexation, tenant relations, administrative management of leases, coordination of technical work, management of any insurance claims and legal assistance where necessary.
We also oversee the financial management of your property and provide you with a detailed monthly report. At the same time, you have permanent access to your My J&J account, where you can find the main documents, rent received, expenditure incurred and corresponding invoices.
When the property needs to be relet, our J&J Properties teams can also manage its marketing and the search for a new tenant.
The aim is to centralise all management with a single partner so that you can enjoy your investment without having to deal with its day-to-day demands.
As soon as a tenant informs us that they are leaving, we organise the various steps to ensure the smoothest possible transition and minimise the rental void.
We arrange the check-out inventory, assess any tenant damage, oversee the final accounts and rental deposit, and coordinate any necessary repairs or reinstatement work.
At the same time, we immediately prepare to relet the property with our J&J Properties teams: marketing the property, arranging viewings and selecting new prospective tenants. Where possible, this process begins before the current tenant has even left.
Our aim is twofold: to protect your interests when the tenant leaves and to relet your property quickly on the best possible terms.
In the event of late or unpaid rent, our priority is to act quickly to prevent the situation from becoming prolonged.
We apply a rigorous follow-up procedure from the first late payment. Our teams contact the tenant and issue progressive reminders to understand the situation and, where possible, secure prompt payment of the outstanding amount.
If the rent remains unpaid, a formal notice may be sent through our legal adviser. If necessary, we will then assist you with legal proceedings and coordinate the case with the relevant professionals.
Our fee structure also helps align our interests with yours: our management fees are calculated on the rent actually received. As long as the rent remains unpaid, we therefore do not charge a management fee on it. Like you, it is in our interest for the situation to be resolved quickly.
You will, of course, be kept informed of developments throughout the process.
Our priority is to protect your rental income and interests, while favouring amicable solutions where they can resolve the situation effectively.
Yes. Our organisation is designed to allow you to monitor your investment wherever you are, without needing to be present at the property.
You have secure, 24/7 access to the My J&J platform. There you will find the key information relating to your property: documents, tenancy agreements, rent received, expenses incurred and the corresponding invoices.
A detailed management report is also sent to you each month, giving you a clear and regular overview of your investment.
Your dedicated property manager naturally remains available by email or telephone to answer your questions and will inform you whenever a situation requires your attention or approval.
This gives you complete visibility over your property, even remotely, while our teams handle its day-to-day management locally.
Absolutely not. You remain the owner and decision-maker for all important matters concerning your property assets.
Our role is to advise and represent you, and to make your life easier by handling the demands of day-to-day management.
At the beginning of our partnership, we jointly define the framework within which our teams may act independently, particularly for routine work. Whenever an expense exceeds the agreed amount or a situation requires an important decision, we seek your approval.
Thanks to your permanent access to My J&J, your monthly report and your dedicated contact, you retain a complete overview of your property's situation at all times.
You therefore remain in control of what matters, while we take care of the day-to-day management.
Since 2016, J&J Management has supported owners in Brussels, Walloon Brabant and the outskirts of Brussels with the day-to-day management of their property portfolios.
We handle the administrative, technical, financial and legal aspects to save you time, safeguard your investment and preserve its long-term value.
Our strength also lies in our integrated approach. Our management teams work directly with J&J Properties to market and let your properties. With more than 200 lettings completed each year, we have practical knowledge of the rental market and can respond particularly quickly when a property needs to be relet.
You benefit from a dedicated property manager, monthly reports and permanent access to your My J&J account, while retaining control over important decisions.
Lastly, we approach your property from an investor’s perspective: rent levels, property condition, works, profitability and scope for optimisation. Our role is therefore not limited to managing your property from day to day; we also help to ensure that your portfolio performs well over the long term.
You retain control over important decisions; we take care of the day-to-day management.
This mainly depends on local demand, the condition of the property and the asking rent.
A well-presented flat that is priced correctly can find a tenant quickly. In practice, from the time the listing is published, it generally takes between 2 and 6 weeks to complete a letting. For certain particularly sought-after properties, this timeframe may be even shorter.
However, our aim is not to let as quickly as possible at any price or to just any applicant. We seek the right balance between the rent level, speed of letting and quality of the tenant.
We therefore optimise the marketing, publication of the listing and organisation of viewings to minimise rental voids as far as possible, while ensuring that applicants are carefully vetted.
With more than 200 lettings completed each year, our teams have practical knowledge of the rental market, enabling them to position your property effectively as soon as it is offered to let.









