Which automations should I build first?

1. Leaving the house

The single highest-value automation in any home. When the last person leaves, the house closes down: aircon off, lights off, water heater off, non-essential plugs off, security armed.

The hard part is knowing everyone has gone. Phone location alone is unreliable - it lags, and it drains batteries. The pattern that works is a combination: phone presence, plus the main door having opened, plus no motion or presence detected for a few minutes. Combine three weak signals and you get one strong one.

Give it a manual override. There is always the day someone is working from home in silence.

2. Coming home

The mirror image, and the one that makes the house feel different. As you approach, the aircon starts in the room you will actually use, the entry lights come up at a level appropriate to the hour, and the gate or door is ready.

Restraint matters here. Every light in the house coming on at full brightness at 11pm is a novelty for one week and an annoyance thereafter. Time of day should change what happens.

3. Going to bed

One action, whether it is a button by the bed, a voice command or a schedule: lights out across the whole house, curtains closed, aircon to its overnight setpoint, doors checked and reported, and the night lighting mode armed so a 3am trip to the bathroom gets five percent floor light rather than the ceiling at full.

This is the automation clients mention most often, because it removes the walk around the house checking things.

4. Occupancy lighting where it earns its place

Bathrooms, the yard, the store room, the corridor, the stairs. Rooms you pass through with your hands full, and rooms where the light gets left on.

Not the living room. A room where people sit still is where naive motion lighting fails - the light goes out while you are reading, and now the smart home is a problem to be solved. If you want automatic lighting in a living space, use a presence sensor that detects a stationary person, and always leave the wall switch authoritative.

5. Aircon that follows reality

In Singapore this is where the money is. Three rules cover most of it:

• Off when the room is empty for more than fifteen minutes.
• Off, with an alert, when a window or balcony door has been open for five minutes.
• Setpoint stepping overnight rather than running at one temperature until morning.

Nothing here is clever. It is just the discipline nobody applies manually.

6. The alerts that actually matter

Most notifications are noise. These are not:

• Water leak under the sink, behind the washing machine or at the heater. This one repays the entire system the first time it fires.
• The main door left open, or unlocked when the house is in away mode.
• A freezer or fridge losing temperature.
• Smoke or gas, pushed to every phone rather than only sounding in an empty flat.
• The washing or drying finished - trivial, and the one everyone ends up relying on.

Anything that does not need action does not need a notification. If an alert gets ignored twice, delete it.

Building them so they last

After the essentials

Once these run reliably for a month, the interesting layer becomes worth building: per-room climate profiles, laundry and appliance chains, guest and helper modes, irrigation on weather forecasts, energy shifting, adaptive lighting, and the household-specific ones that only make sense in your home. That is what the design session is for.