Renovation of your home in Aeroe.
Ærø is a small island in the South Funen Archipelago with just 6,000 residents — one of Denmark's most charming and distinctive islands. Ærøskøbing is one of Northern Europe's best-preserved towns from the 17th and 18th centuries. The island is known for its green energy profile and is an international model for renewable energy. The housing market is characterised by many summer cottages and a high share of unoccupied homes.
Aeroe in brief — context for your renovation.
energy_savings_leafGreen energy pioneer
Ærø is internationally recognised for its energy policy: solar thermal, heat pumps and renewable energy cover a large share of the island's heating needs. Ærøskøbing Fjernvarme has significantly expanded its solar collector installations since the year 2000 and is a global beacon.
foundationHistoric buildings with heritage value
Ærøskøbing has been designated Europe's best-preserved small town from the 17th and 18th centuries. Many houses are listed or carry heritage value — renovation requires particular attention to authenticity and materials.
landscapeIsland pricing and freight costs
Ærø is an island — materials and tradespeople must be ferried across. This typically adds 10–20% to building material and labour costs, and makes it difficult to attract specialist craftspeople. Allow extra budget when planning projects.
Your housing type.
Older detached house and farmhouse from 1850–1970
74% of homes in Aeroe — approx. 2,481 dwellings (source: Statistics Denmark 2025)
Detached houses and farmhouses dominate Ærø's housing stock. Many are older than elsewhere in Denmark — a mix of historic half-timbered houses in Ærøskøbing, brick farmhouses and newer detached houses. 29% of homes are unoccupied, many are summer cottages. Renovations must respect the island's building tradition.
What's typical?
- — Half-timbered or brick exterior walls
- — Pitched roof with clay tiles or slate
- — District heating in towns, heat pump or wood-burning stove in rural areas
- — Garden with mature planting
Common weaknesses
- — Insufficient insulation in historic buildings
- — Moisture problems in older structures
- — Freight surcharge on materials
- — Difficult to find specialist craftspeople
Typical costs
New clay tile roof
110,000–260,000 kr
Including freight to Ærø. Clay tiles are the correct material for heritage buildings. 10–20% surcharge compared to mainland prices. . Source: Bolius
Energy windows (per window)
5,000–10,000 kr
Heritage buildings often require bespoke windows. Freight surcharge and specialist craftsmanship. . Source: Bolius
New bathroom
100,000–250,000 kr
Full renovation including plumbing. Island surcharge on freight and labour. . Source: Bolius
Do you need an architect?
Probably not necessary for:
- — Interior renovation
Architect recommended or required for:
- — All exterior work on heritage buildings
- — Roof replacement on listed or heritage-value houses
- — Extensions
- — Energy improvements affecting the façade
Terraced house and apartment
18% of homes in Aeroe — approx. 481 dwellings (source: Statistics Denmark 2025)
Terraced houses and apartments mainly in Marstal and Ærøskøbing. Smaller share of social housing. Connected to district heating.
What's typical?
- — Brick terraced houses and flats
- — District heating
- — Smaller units
Common weaknesses
- — Ageing installations
- — Freight surcharge on materials
Typical costs
Energy renovation
200,000–450,000 kr
Roof, windows and insulation. Island surcharge of 10–20%. . Source: Bolius
Do you need an architect?
Probably not necessary for:
- — Interior renovation
Architect recommended or required for:
- — External alterations and extensions
Local conditions in Aeroe.
local_fire_department District heating — Ærøskøbing Rise Fjernvarme
Ærøskøbing Rise Fjernvarme (aeroe-varme.dk) supplies district heating based on solar thermal, heat pumps and biomass. The island is an international model for green energy supply. In Marstal, Marstal Fjernvarme supplies heat. Prices are below the national median.
account_balance Heritage value
Ærøskøbing is one of Europe's best-preserved towns from the 17th and 18th centuries and has a large number of listed and heritage-value buildings. Renovation almost always requires municipal approval and attention to authenticity and materials. Contact Ærø Municipality early in the process.
Look up your address at the Danish Heritage Agency's FBB register
assignment Building permit in Aeroe
Apply for a building permit via Byg & Miljø. Due to the large number of heritage buildings, a local plan assessment and approval from the Danish Agency for Culture and Palaces are often required.
savings Grants for energy renovation
Subsidies for energy renovation are available via Sparenergi.dk. Island residents should in particular look into support for energy improvements — Ærø Municipality and the Ærø Energy and Environment Office provide guidance.
Aeroe in figures.
Data from Statistics Denmark (2025) and the Danish Heritage Agency — context for your property.
Dwellings total
30% vacancy rate
Listed buildings
Source: Danish Heritage Agency FBB
Social housing units
Source: Landsbyggefonden
CO₂ emissions by sector
Energy
3,665 tonnes CO₂
Transport
8,121 tonnes CO₂
Chemical processes
368 tonnes CO₂
Agriculture and land use
18,375 tonnes CO₂
Waste disposal and biogas
405 tonnes CO₂
Wastewater
167 tonnes CO₂
Frequently asked questions
about renovation in Aeroe.
Two things stand out: heritage considerations and island pricing. Many houses have heritage value and require special materials and approvals. And all materials are transported by ferry, which adds a 10–20% surcharge. Plan well in advance and allow extra budget.
Yes, Ærøskøbing and Rise are served by Ærøskøbing Rise Fjernvarme (aeroe-varme.dk), and Marstal by Marstal Fjernvarme. Both use primarily solar thermal and heat pumps. Prices are below the national median.
Yes, but it requires approval from the Danish Agency for Culture and Palaces and Ærø Municipality. You may not alter the building's external character — roof, windows, façade and detailing must be preserved. An architect experienced with heritage buildings is strongly recommended.
Allow for a 10–20% surcharge on materials due to ferry transport. Tradespeople from the mainland often require daily allowances and transport costs. Local craftspeople are limited — book them early.
Ærø is a niche market — popular as a summer cottage destination and for people seeking peace and nature. Heritage buildings in Ærøskøbing attract a loyal demand. Renovations that respect the original character deliver good returns.
Next steps.
Green district heating on Ærø
Ærøskøbing Rise Fjernvarme — solar thermal and heat pumps as an international model.
foundationRenovating heritage buildings
What requires approval, and which materials are permitted?
buildEnergy renovation with respect for building heritage
How to improve energy performance without compromising the original character.
Tell us about your project in Aeroe.
We help homeowners in Aeroe prioritise renovation and get started — from the first assessment to completed project.
Start your dream here