Renovating in Berlin: what's allowed and what it costs

Berlin is a city of old buildings: late-19th-century Altbau with high ceilings and floorboards, post-war blocks, prefabricated Plattenbau in the east. Many buyers fall in love with a flat full of stucco – and underestimate what renovating it costs, how long it takes and how much say the city has. Here is where things stand in autumn 2026.

The picture: Germany renovates less than ever

Nationwide, only 0.67% of residential buildings were renovated for energy efficiency in 2025 – the lowest figure in years, according to a survey for the German association for energy-efficient building envelopes (BuVEG). Meeting the climate targets would take about 2% a year. The reasons: high construction and interest costs, and long uncertainty over the heating law.

For buyers this cuts both ways: many buildings have a renovation backlog that should show in the price. And if you renovate now, you compete for tradespeople – above all in the trades everyone needs.

Tradespeople: it depends on the trade

Overall, order books in the trades have eased. According to the German Confederation of Skilled Crafts (ZDH), capacity use was 75% in the first quarter of 2026 and orders reached just under 9 weeks ahead on average. With less new building, painters, drywallers and tilers are easier to find than two years ago.

Electrics, heating/plumbing and roofing are different: these firms benefit from heat pumps, solar panels and legal requirements and are fully booked in many places. Plan in months, not weeks.

What does renovation cost in Berlin?

Treat flat-rate figures with care – every flat is different. Berlin renovation firms quote roughly:

On top come rising prices: the construction price index for residential buildings was just over 3% above the previous year at the start of 2026.

An example shows what this means for your financing – an Altbau flat for €380,000 with a €70,000 renovation:

Note: renovation costs don't increase the transfer tax, but they do increase the loan. Many banks will finance the renovation too if you back it with quotes from the start.

Typical problems in Berlin's old buildings

• Timber-beam ceilings: in late-19th-century buildings, timber beams carry the floors. Where the beam ends sit in damp masonry, they can rot. The most feared finding is dry rot (Hausschwamm) – a fungus that destroys wood and spreads through masonry. A musty smell, white cotton-wool-like growth or brittle wood are warning signs. Fixing it is expensive and often affects the whole building.
• Box-type double windows (Kastendoppelfenster): two window casements one behind the other. They block noise surprisingly well but lose heat. It often pays to restore and seal them rather than replace them – in a listed building that's usually required anyway.
• Gas heaters per flat (Gasetagenheizung): in many Berlin Altbau flats each flat has its own gas boiler. It may keep running. But switching later to district heating or a central heat pump is a decision for the whole owners' association – and a bigger job.
• Electrics and pipes: old wiring without earthing and lead pipes are not unusual in unrenovated buildings.
• Damp cellars: typical of old buildings without waterproofing.

The rules: social preservation and heritage protection

Social preservation areas

Large parts of the inner-city districts are social preservation areas (Milieuschutzgebiete). There, almost any structural change to flats needs approval from the district office – the aim is to stop luxury renovations that push tenants out.

Since December 2024 these rules have been uniform across Berlin. Approval is usually given for work that brings a flat up to a contemporary standard:

• a first bathroom or central heating where there is none,
• a lift, a balcony up to about 4 m²,
• insulation required by law,
• following a ruling by the Berlin administrative court, also wall-hung toilets and standard towel radiators.

Usually not approved: a second bathroom, underfloor heating, merging flats and larger changes to the layout.

Heritage protection

Many old buildings are listed or part of a protected ensemble. Then the heritage authority has a say on windows, façade, roof and often the staircase and doors. That makes renovations dearer and slower. In return: for a listed building you live in yourself, renovation costs agreed with the heritage authority can be deducted from income tax at 9% a year for ten years.

Berlin's heat plan

In June 2026 the Senate adopted Berlin's heat plan (Wärmeplan). It divides the city into areas:

• district heating priority areas, where the network is to be extended by a given year (2030, 2035, 2040 or 2045),
• areas for decentralised solutions such as heat pumps,
• examination areas, where it's still open which option will win.

The plan doesn't oblige anyone to do anything – the choice of heating stays with the owners. But it's a valuable guide: a map on berlin.de lets you look up any address. If you buy a flat with an old gas heater in a future district heating area, you have a realistic path for switching.

Subsidies

• Replacing the heating: the federal government subsidises climate-friendly heating through KfW, covering 30 to 80% of eligible costs depending on income.
• Families buying an older home: since August 2026, KfW's "Jung kauft Alt" programme offers low-interest loans of up to €180,000 and also allows single renovation measures.
• State programmes: the Investitionsbank Berlin (IBB) runs its own programmes; which are open changes often.

In short

• Germany renovates less than ever – many buildings have a renovation backlog.
• Electricians, heating engineers and roofers are scarce; other trades are easier to book again.
• Expect €1,000 to €2,000 per m² for a full renovation, more for listed buildings.
• Check social preservation rules before planning: a second bathroom and underfloor heating are usually off-limits there.
• Look up the heat plan to see how the flat could be heated in future.