You can change the kitchen, the bathroom and the floor, but noise from neighbours and the street is hard and expensive to fix after you buy. So it pays to understand how sound travels through a building and which measures actually help. Some of the most popular solutions do little, while some cheap details do a lot.
The two are tackled differently. Measures against one often do little against the other.
Sound insulation follows a few simple rules:
If the noise comes from next door through a party wall, the solution that works is an independent wall lining: a free-standing metal frame set off the wall, mineral wool in the cavity, and dense plasterboard, often in two layers. The key is that the frame is not rigidly fixed to the wall, and every joint and socket is sealed.
Myth: acoustic panels, foam and "egg boxes" do not stop noise from the neighbours. They absorb reflected sound inside the room — reducing echo and making the room feel quieter — but barely affect what comes through the wall. They are useful for a study or home cinema, not for insulation.
Impact noise from above is solved from above — in the upstairs flat. The most effective measure is a floating floor: a screed or finish laid on a resilient acoustic layer and separated from the walls by a perimeter strip. A good underlay beneath laminate helps too.
If you are replacing your own floor, be careful. The Condominium Management Act prohibits renovation that worsens the design performance of building products. Remove the acoustic layer and lay a hard finish straight onto the slab, and you risk a dispute with the neighbour below.
A suspended ceiling on resilient hangers with mineral wool reduces airborne noise from above, but helps only a little with footsteps.
The window is almost always the weakest point of the façade. What makes a difference:
A new window with old, cracked seals loses much of its benefit.
The front door to the stairwell lets in voices and lift noise. A solid-core door, seals all round the frame and an automatic drop seal at the bottom help. The same applies to the bedroom door if the living room is noisy.
Drain stacks, the lift machinery, the heating substation, a shop on the ground floor — these are hard to insulate once the building is up. Wrapping a drain stack in mineral wool and acoustic tape helps against the sound of running water.
Bulgaria's Ordinance No. 6 of 2006 on noise indicators sets limits for noise entering living rooms — 35 dB(A) by day and evening, 30 dB(A) at night. In practice it is a reference point in a dispute, and measurements can be made by an accredited laboratory. Noise from neighbours "beyond the ordinary" is also a breach of the Condominium Act.
The type of building matters too — more on panel, slip-form and brick blocks in our guide to older apartment blocks, and the full checklist in our guide to viewing a home. If you are planning work, see also renovating a flat in a block.
At viewings we pay as much attention to noise as to light. If you are looking for a quiet home to buy, call us or come into the office.
This is general information. For a specific project, consult an engineer or acoustics specialist. Verified as of October 2026.
