Key takeaways
- Airborne, impact and equipment noise are three separate problems. The phrase "it is soundproofed" settles none of them.
- Follow the route from the bedroom to the corridor, the lift and the shared spaces on the plan.
- Ventilation and equipment noise depends on design, installation, commissioning and maintenance together.
- Judge a gym, rooftop or lounge by its position and opening hours, not by its existence.
- A quiet short visit is not evidence of acoustic performance. Ask for a report that matches the space and test conditions.
Why can a sales photo not show acoustic comfort?
Because a photo has no sound. It shows the view, the light and the terrace. It does not show the corridor, footsteps from the floor above or a plant room switching on.
Part of a home's quality is revealed only by listening. Near the sea this matters more, because buyers often decide on the view and meet everyday sound only after moving in.
What does acoustic comfort mean in a coastal apartment?
It means the resident stays in control of what they hear. It does not mean removing every sound. You may enjoy the waves and still not want a neighbour's conversation in the bedroom.
Open the window and you move closer to the surroundings. Close it and you should get your private space back. Design, construction and the way the building is run all contribute to that choice.
What is the difference between airborne, impact and equipment noise?
They travel by different paths and are measured differently. The ISO 10052 standard for field measurement treats airborne sound insulation, impact sound insulation and the sound of building services as separate topics.[1]
- Airborne noise: voices, television and music passing through air and walls.
- Impact noise: footsteps, dropped objects and chairs dragged across a floor, carried through the structure.
- Equipment noise: ventilation, pumps, lifts and pipework heard while they run.
So instead of asking "is it soundproofed?", ask which kind of noise, in which room, assessed by what method.
What should you look for on the floor plan?
Trace the route from the bedroom to the corridor, the lift and the shared spaces. If a sleeping-room wall backs onto a corridor, a lift shaft or a space that is active at night, that is where to ask questions.
Also ask where equipment sits and which areas are used in the evening. These questions do not give a final verdict, but they stop the discussion from ending on a vague phrase. Layout is easiest to judge before materials are chosen and costly to fix afterwards.
Why does noisy ventilation matter?
Because a noisy system gets switched off, and then it no longer does the job it was installed for. NHBC guidance on noisy systems points out that design, duct routes, installation, commissioning and maintenance have to be considered together.[2]
The name of a unit does not describe the experience in the room. Ask how the system runs in the bedroom, who signs off its commissioning and how regular servicing is arranged.
How do a gym, rooftop or lounge affect your privacy?
What matters is position, access route and operating hours, not just the presence of facilities. A gym above a bedroom or a usable roof beside a unit feels different at different times of day.
Here building design and building management meet. Ask how opening hours are set and who handles resident complaints. For the operating side, see our article on building operations and service models.
How do you listen properly during a visit?
Pause the sales talk for a few minutes and turn your back to the view. Listen to the inside. This is not a professional test. It only makes your questions sharper.
- Stand in the bedroom and stay quiet.
- Try the window once open and once closed.
- Spend a moment in the corridor and near the lift.
- Ask when equipment runs and when shared spaces are used.
- If possible, come back at a different time of day.
If the home is for seasonal use or short stays, combine this routine with the questions in our second-home guide for northern Iran.
What you hear and what to ask
The table below sums up the idea. Each sound you notice, or worry about, points to a specific question.
| What you hear or wonder about | What needs to be made clear |
|---|---|
| Voices and television | How walls and sound paths perform |
| Footsteps or dragged furniture | Impact sound transmission through floor and ceiling |
| A machine or pipe noise | Operating conditions, installation and servicing of equipment |
| A lounge or gym nearby | Layout, opening hours and how complaints are handled |
What do a quiet visit and a lab report actually prove?
Neither proves how the whole apartment performs. An empty building does not show future living conditions, and one quiet visit is not evidence.
When a specific claim is made, ask for a report for that space and those test conditions. A laboratory result for one component, without checking how the assembly was built, does not confirm the whole unit. Labels such as "coastal tower" or "hotel-style services" do not replace this check either.
How does Azhianeh approach this?
Azhianeh is a Tehran-based architecture and development practice working in Tehran and Mazandaran. Its founders, Dr Hassan Taheri and Dr Shokoufeh Zaheri, link the quality of a home to how it is actually used.
We think the plan, the construction specification and the way a building is operated must be read together. Specific performance can only be discussed from the documents of that project. A home should allow you to host, and also to step away.
Frequently asked questions
How do I check noise before buying an apartment near the sea?
Do three things. Trace the route from the bedroom to the corridor, lift and shared spaces on the plan. Stand quietly in the bedroom during a visit and listen with the window open and closed. Then ask about equipment and the opening hours of shared facilities. This is not a technical test, but it sharpens your questions.
What is the difference between airborne, impact and equipment noise?
Airborne noise travels through air, such as voices and television. Impact noise travels through the structure, such as footsteps and dropped objects. Equipment noise comes from ventilation, pumps, lifts or pipes. The ISO 10052 field-measurement standard treats these separately, so an acoustic claim should say which one it covers.
Is the phrase "it is soundproofed" enough?
No. It does not say which type of noise was assessed, in which room or by what method. Ask whether the claim concerns airborne, impact or equipment noise, and whether a report exists for that space and those test conditions.
Why does the ventilation system matter for noise?
A noisy ventilation system may be switched off by the resident, which defeats its purpose. NHBC guidance stresses that design, duct routes, installation, commissioning and maintenance need to be considered together. The equipment name alone does not tell you how quiet the bedroom will be.
Can a gym or rooftop lounge reduce the peace of a unit?
It can, depending on position, access route and operating hours. The facility itself is not the problem. Ask where active spaces sit relative to bedrooms, when they are open and how resident complaints are reviewed and resolved.
Is one quiet viewing enough to decide?
No. An empty building does not fully show future living conditions. Return at a different time of day if you can, and ask for a report matching the space and test conditions behind any specific claim. Rules and practice differ by project, so have the final check done by an independent specialist.
Let us read the plan alongside these questions
If you want to test how a project's plan and operating approach fit your lifestyle, request the unit plan and documented specification from the Azhianeh team. You can start a conversation or look at the Rokan Sense project page, where images are concept images.
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- ISO 10052:2021 - Field measurements of airborne and impact sound insulation and of service equipment sound
- NHBC - Noisy Systems (Future Homes: avoiding unintended consequences)