Selling property in Kölliken: figures and rules

There is no official price series for Kölliken. Unlike the Canton of Zurich, the Canton of Aargau publishes no median prices by municipality. Portal values for Kölliken rest on offers, not on completed sales.

What is on record is the stock: Kölliken has 1,316 buildings with residential use in the Zofingen district. 969 of them are single-family houses, or 73.6%. The cantonal figure is 65.9%. Kölliken ranks 1 of 17 in the Zofingen district. In total, Kölliken has 2,331 dwellings. 54.3% were built before 1981, against 51.8% in the canton. 21 hectares of 169.5 hectares of building zone are undeveloped, or 12.4% (as of 2022). For the share of undeveloped zone, Kölliken ranks 26 of 196 in the canton.

What your house in Kölliken is worth follows from comparable sales, the plot and its condition. The free assessment provides a written range with its explanation.

The Villa Breitenegg is a property of Kölliken’s local citizens’ community.¹³ According to its 2026 budget, the villa will be demolished to make way for new flats.¹² The citizens’ community has sold the project rights to Immo Breitenegg AG.¹³ The municipality announced a public information evening on the «Breitenegg» senior flats for 29 October 2026.¹⁴ For owners of retirement age, this could open a path from their house into a flat in the village.

Kölliken also has its own climate and energy guide. It goes back to a motion at the municipal assembly on 17 May 2019.¹⁵ The council issued it on 3 August 2020, and it took effect on 1 January 2021.¹⁵ Among its indicators are heating systems renewed to run on renewable energy.¹⁵ It names buildings as the largest consumers of energy.¹⁵ For a sale, this means that owners who keep records on heating, roof and windows can answer buyers’ questions quickly.

In Kölliken, 714 of 1,316 buildings with residential use date from before 1981. That is 54.3%. Among the 196 municipalities in the canton, that is rank 55, counting from the highest share. In the Zofingen district: rank 12 of 17. Kölliken therefore has a higher share than the canton at 51.8%. Compared with Kölliken, the figure in Oftringen is 54.7%.

In Kölliken, oil or gas heats 777 buildings with residential use, 59.0%, against 51.8% in the canton. Among the 196 municipalities in the canton, that is rank 39, counting from the highest share. For many owners in Kölliken, the heating is therefore a topic.

Records of heating, roof and windows therefore belong in the sale documents for Kölliken. For owner-occupied homes in Kölliken, the imputed rental value and the maintenance deduction end on 1 January 2029.¹ Whether a renovation in Kölliken still pays off first is covered in Renovate or sell.

Kölliken has 5,133 residents. 951 of them, 18.5%, are 65 or older, against 19.5% in the canton. Among the 196 municipalities in the canton, that is rank 127, counting from the highest share. In the Zofingen district: rank 10 of 17. Compared with Kölliken, the figure in Oftringen is 16.9%.

On 1 June 2026, 17 homes in Kölliken were empty, 0.73% of the stock, against 1.05% in the canton. Among the 196 municipalities in the canton, that is rank 85, counting from the lowest vacancy. The rate for Kölliken covers rented and owner-occupied homes, not the supply of houses.

The municipal tax rate of Kölliken is 119%. Among the 196 municipalities in the canton, that is rank 167, counting from the lowest tax rate. How Kölliken compares for the same income and wealth is shown in the municipality atlas. By public transport, Zurich HB is 49 minutes away from the Kölliken stop, with 1 change.

In Aargau, property gains tax falls with every full year of ownership. The rate drops from 40 per cent in year one to 5 per cent after 25 full years.² After more than ten full years, a house gets at least a flat-rate cost deduction: 80 down to 65 per cent of the sale price.³

If you sell your permanent and exclusive home, you can apply to defer the tax.² You must buy or build a new Swiss home within 2 years before or 3 years after the sale.² Only the reinvested proceeds are deferred.² Deferred does not mean waived: the next taxable sale also taxes this gain.²

Aargau has no classic transfer tax. Instead, the canton charges a land register levy (Grundbuchabgabe) on every sale: 4 per mille of the price.⁴ Buyer and seller are jointly liable; the law does not say who bears it.⁴

Only an Aargau notary (Urkundsperson) may notarise the sale contract.⁵