10 Things You Must Prepare Before Renovating Your Home

Before your renovation begins, make sure you have these in place: a contingency fund equal to 20% of your total budget, a licensed contractor with a written contract, valid PBG building permits, a realistic timeline, an inspection of your electrical and plumbing systems, a security and fire protection plan, sustainable materials, a lighting design, proper ventilation, and updated property insurance. Skip even one item on this list, and a dream project can turn into an expensive nightmare.

Home renovation is a major investment, financially and emotionally. The irony is that most homeowners spend months choosing tiles and paint colors while ignoring the fundamentals that actually determine whether the entire project succeeds or fails.

Why a Renovation Checklist Matters More Than You Think

Renovation without thorough preparation is a recipe for cost overruns. Construction industry surveys in Indonesia consistently show that renovation projects lacking proper planning experience budget blowouts of 30% to 50% beyond initial estimates. That is far beyond what most household budgets can absorb.

But the risks go beyond money. Poorly planned renovations create real safety hazards: electrical wiring that does not meet standards, absent fire protection systems, and security vulnerabilities that stay open throughout the construction period and sometimes long after.

Budget and Contingency Fund

A 20% contingency reserve is the industry standard. It is not optional. Renovations almost always uncover surprises behind the walls — corroded pipes, rotting beams, foundation issues that were invisible during the initial visual inspection. These discoveries are not unusual. They are expected. The only question is whether you have the funds to deal with them.

The safe budgeting formula works like this. Calculate your total renovation cost thoroughly, covering materials, labor, and finishing. Add 20% as a contingency fund and keep it in a separate account. Then set aside another 5% for permits, technical consultations, and genuinely unexpected expenses.

Do not touch the contingency fund for aesthetics. That money exists for technical emergencies, not for the granite upgrade that suddenly looked appealing in the showroom. The moment you start dipping into contingency for design changes, you have no safety net left for the problems that actually threaten your project.

Choosing a Contractor: Licenses, Portfolio, and a Written Contract

The right contractor is the best insurance policy your renovation can have. In Indonesia, legitimate contractors must be registered with the Construction Services Development Board (LPJK) and hold a valid Business Entity Certificate (SBU). This is not bureaucratic formality. It is proof that the contractor is bound by professional standards and can be held legally accountable.

Before signing anything, verify four things. First, confirm their LPJK license is active and matches the classification of work you need. Second, review their portfolio for projects similar in scale and type to yours. Third, ask for client references you can contact directly — not testimonials on a website, but actual people who will pick up the phone. Fourth, insist on a written contract that covers scope of work, timeline, payment schedule, penalty clauses for delays, and workmanship warranty terms.

A verbal agreement protects nobody. Professional contractors are actually more comfortable with clear written contracts, because those contracts protect both sides equally.

Building Permits: PBG Is Mandatory, Not Optional

Structural renovation without a permit is a real legal risk. Since the enactment of Indonesia's Job Creation Law (Undang-Undang Cipta Kerja), the former Building Construction Permit (IMB) has been replaced by the Building Approval (PBG — Persetujuan Bangunan Gedung). The name changed, but the legal obligation remains: any structural modification to a building requires approval from the local government.

Renovations that typically require a PBG include adding a floor or changing building height, changing the function of a room (converting a garage into a bedroom, for example), extending the building beyond the Building Setback Line (GSB), and modifying roof or foundation structures.

A building renovated without permits risks forced demolition. It also complicates any future property sale, because buyers and their notaries will check permit status during due diligence. The cost of obtaining a PBG is a fraction of the cost of dealing with the consequences of not having one.

Set a Realistic Timeline by Renovation Type

Renovations always take longer than promised. Plan for that from the start, and you will save yourself weeks of frustration.

As a general reference, minor renovations — repainting, replacing tiles, small repairs — typically run 2 to 4 weeks. Medium renovations covering kitchen or bathroom remodels, ceiling repairs, and window frame replacements usually take 1 to 3 months. Major renovations involving floor plan changes, room additions, or full-scale remodeling run 3 to 6 months or more. A total renovation with structural changes can take 6 to 12 months.

These are estimates, and actual duration depends on scale, existing conditions, and material availability. The factors that most frequently cause delays are late material deliveries, rainy season weather, permit processing times, and design changes made after work has already started. That last one is the most controllable — and the most common cause of timeline blowouts. Finalize your design before construction begins, not during.

Inspect Electrical and Plumbing Systems

Behind those beautiful walls sits the infrastructure that determines whether your home is actually safe to live in. Before the renovation crew closes up walls with new material, this is the best — and most cost-efficient — moment to inspect and upgrade hidden systems.

For electrical work, check that your power capacity matches the demands of modern appliances. A mid-sized residence needs a minimum of 2,200 VA; homes with heavy-use appliances like induction cooktops, EV chargers, or multiple AC units should plan for 3,500 to 5,500 VA. Inspect all wiring for SNI compliance and look for cable insulation that has hardened or started peeling — both are signs that the wiring has exceeded its safe service life. Confirm that each zone has its own MCB (Miniature Circuit Breaker) for optimal protection, and verify that grounding is properly installed at every outlet point.

For plumbing, examine clean water pipes and drainage for signs of corrosion, leaks, or chronic blockages. Check that drainage pipe slopes are sufficient to prevent standing water. Verify septic tank capacity or connection to the communal wastewater system.

Do not plan to retrofit these systems after renovation is complete. Fixing electrical or plumbing issues after finishing materials have been installed typically costs 3 to 5 times more, because you are paying to tear out brand-new work just to reach the pipes and wires behind it.

Security Systems and Fire Protection

Renovation is the window of opportunity to build an integrated security system into your home — not bolt one on after everything is finished. This is one of the most frequently overlooked points on any renovation checklist, which is unfortunate because its implications for safety and long-term property value are among the largest.

Why is renovation the right time? While walls are open, ceilings are accessible, and cables can be routed cleanly without damaging any finishing material. Installing security during this phase delivers three advantages that you cannot replicate later. First, the aesthetics are clean — cables hidden inside walls, sensors mounted flush with surfaces, no messy surface-mounted wiring running along your freshly painted walls. Second, you only pay for the work once instead of paying for installation and then paying again to open and close walls. Third, the system is designed around your new floor plan rather than awkwardly adapted from the old one.

The security components worth planning during renovation start with fire alarm systems. Fire protection is a basic safety requirement, not a luxury add-on. A modern fire alarm system includes smoke detectors, heat detectors, and an integrated notification system. Sensor placement needs to be planned before the ceiling is closed — once gypsum board is up, adding sensors means cutting holes and running cables along exposed surfaces.

CCTV placement depends entirely on your floor plan. The points that generally need coverage are the main entrance, garage, rear access area, and stairway access for two-story homes. During renovation, power and data cables for cameras can be routed inside walls for a clean, professional result. A camera installed during renovation looks intentional. A camera installed afterward, with cable channels running along the exterior wall, looks like an afterthought — because it is.

Alarm sensors on doors, windows, and PIR motion detectors form the first detection layer of a home security system. The ideal sensor positions should be planned alongside the layout of new doors and windows, not after the frames are already installed. Adjusting sensor placement once construction is complete means drilling into finished surfaces and accepting compromised positioning.

For any of these systems to deliver real protection, they need to connect to a 24/7 monitoring center that can dispatch a response when an alert triggers. A sensor that detects but has no one listening is just a notification. A sensor connected to a monitoring center with a physical response team is actual security.

Materials and Sustainability

The materials you choose today will determine your operating costs and environmental footprint for the next 20 years. Several material considerations tend to slip past homeowners during the excitement of renovation planning.

Durability versus upfront cost is the most common trap. A cheap material that needs replacement every 5 years is more expensive over the long term than a single investment in a higher-grade alternative. Calculate the 10-year cost, not the purchase price.

Thermal rating matters in Indonesia's climate. Materials with good heat insulation significantly reduce the load on your air conditioning system, which translates directly to lower monthly electricity bills. This is especially relevant for roofing and wall materials on sun-facing surfaces.

For environmental certifications, look for timber products with SVLK certification (Indonesia's Timber Legality Verification System) and interior materials with low VOC (Volatile Organic Compound) content. Low-VOC products improve indoor air quality, which is particularly important in bedrooms and spaces where children spend time.

Check material availability before you commit. Imported or specialty materials with long lead times can stall your construction schedule for weeks. Confirm delivery timelines match your project timeline before placing orders.

One additional point for older homes: buildings constructed before 1990 may contain asbestos in roofing or ceiling materials and lead-based paint on older walls. Identification and removal of hazardous materials must be handled by qualified professionals before renovation work begins. This is not a DIY task.

Lighting Design

Lighting planned from the start produces a fundamentally different home than lighting added as an afterthought. The most common mistake is leaving all lighting decisions to the contractor or buying fixtures last-minute at the building supply store. Good lighting is a combination of ambient lighting for general illumination, task lighting for functional areas like kitchen counters and reading spaces, and accent lighting for aesthetic effect.

Several decisions need to be made before the ceiling is closed. Lamp point positions and cable routes cannot be changed without tearing open finished ceilings. Fitting types matter — recessed downlights require gypsum ceilings of specific thickness and construction. Switch and dimmer locations should follow the intuitive movement patterns of how people actually use each room, not where it was convenient for the electrician. And if you plan to integrate lighting with a smart home system, the wiring infrastructure needs to be in place from the beginning. Adding smart lighting wiring after walls are closed means visible surface channels or expensive reopening work.

Ventilation and Air Circulation

Indoor air quality has a direct impact on the health of everyone living in the house, and Indonesia's tropical climate with its high humidity makes this more than an abstract concern.

Renovations that ignore ventilation produce stuffy rooms, condensation problems on walls, and mold growth that damages finishing materials and creates respiratory health risks. The fix after the fact is expensive and disruptive.

Cross ventilation — openings on two opposite sides of a room for natural airflow — should be a design goal for every habitable space. Exhaust fans are mandatory for bathrooms, kitchens, and any room without direct outdoor access. AC evaporator units should be positioned to distribute air evenly across the room, not just cool the area directly below. And attic spaces need proper ventilation to prevent heat from being trapped and radiating down into the top floor.

For homes in dense urban areas or on narrow lots where cross ventilation is physically impossible, consider a mechanical ventilation system (HRV or ERV) as a long-term solution. The initial cost is higher, but the improvement in livability and the reduction in mold-related maintenance make it worthwhile over the life of the home.

Property Insurance During and After Renovation

Renovation technically changes the insurance status of your existing property. This is a point that almost everyone overlooks: standard property insurance policies typically include clauses that limit or even void coverage during active construction periods. You might assume you are covered. Read the fine print — you probably are not.

Before renovation starts, contact your insurance company and inform them of your renovation plans. Request written confirmation of what is and is not covered during the construction period. Consider a Contractor's All Risk (CAR) insurance policy, which specifically covers risks during the project, including property damage, worker injuries, and third-party liability. Once the renovation is complete, update your coverage amount to reflect the new property value.

Professional contractors generally carry their own liability insurance. Ask for proof before work begins. If they hesitate, that tells you something about how they handle risk — and how they will handle yours.

Start With What Cannot Be Fixed Later

Home renovation is a rare chance to rebuild your living space to match exactly what you need and want. Too many homeowners come out of the process with regrets, not because of design choices, but because of things that should have been considered long before the first wall came down.

Use this checklist as your starting point. Adapt it to the specific conditions of your property. And for security systems, do not wait until renovation is finished. Schedule a consultation with SECOM Indonesia before your contractor begins work, so that security and fire protection can be integrated into your new home design from the start.

Peace of mind does not come from a beautiful renovation alone. It comes from a home that is genuinely safe.