House Splitting into Two Apartments Cost Netherlands 2026 — Conversion Guide

Quick Answer

Splitting a terraced house or semi-detached home into two self-contained units in the Netherlands costs € 30,000–€ 80,000 in 2026. The main works involve separate entrances, bathrooms, kitchens, fire-rated partitions and separate utilities. Payback through rental income in major cities: typically 3–8 years.

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Costs by Work Type

| Work item | Description | Cost | |---|---|---| | Second entrance / front door | New access (side or rear) | € 2,000–€ 8,000 | | Second bathroom + WC | New plumbing + tiling | € 6,000–€ 15,000 | | Second kitchen | Worktop, hob, utility connection | € 5,000–€ 15,000 | | Fire-rated partition (EI 60) | 60-minute fire separation | € 3,000–€ 10,000 | | Sound insulation (Rw ≥ 52 dB) | Floating floor + wall treatment | € 5,000–€ 15,000 | | Separate utility meters (gas, water, electricity) | Utility company + electrician | € 2,000–€ 6,000 | | Separate ventilation (MVHR) | Mechanical ventilation per unit | € 2,500–€ 6,000 | | Architect and permit | Drawings + application | € 3,000–€ 8,000 | | Total | | € 28,500–€ 83,000 |

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Is Property Splitting Financially Worthwhile?

In the Netherlands' tight housing market, splitting is often attractive:

• Rental income: € 700–€ 1,400/month for a self-contained studio or apartment
• Payback period: 3–8 years depending on investment and local rents
• Resale value: two registered units are typically worth 20–40% more combined than a single house

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Do You Need a Permit?

Always. Splitting a house is a change of use requiring an omgevingsvergunning:

• Conversion from one to two residential units
• Sometimes a separate splitsingsvergunning from the municipality
• Technical requirements: fire safety (EI 60/REI 60), acoustic separation (Rw ≥ 52 dB), daylighting, separate ventilation
• Apartment complex/VvE: unanimous consent from all apartment association members required

Average permit processing time: 8–16 weeks.

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Do You Need an Architect?

Always for property splitting. Reasons:

• Permit application requires architectural drawings
• Architect checks feasibility against the Dutch Bouwbesluit (fire safety, ventilation, acoustics, daylighting)
• Structural engineer checks whether the floor can carry additional loads
• Coordination with municipality and utility companies for separate connections

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Dutch Building Code Requirements

| Requirement | Bouwbesluit standard | |---|---| | Fire-rated separation | EI 60 (wall) / REI 60 (floor) | | Acoustic separation | Airborne Rw ≥ 52 dB; impact Lnw ≤ 58 dB | | Daylighting | Min. 10% of floor area per habitable room | | Ventilation | Separate mechanical ventilation per unit | | Escape routes | Independent escape route per unit | | Minimum floor area | Typically ≥ 18 m² per studio (municipal policy) |

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Alternatives and Variations

• Room-by-room rental (woningdelen): lower investment, less income; sometimes requires omzettingsvergunning
• Garden annex / tiny house on own land: an alternative without major structural changes
• Cadastral splitting (notarial split): required for separate registered properties; involves notary and apartment-rights legislation (VvE)

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Conclusion

Splitting a house in the Netherlands in 2026 costs € 30,000–€ 80,000 and always requires an omgevingsvergunning and an architect. In cities like Amsterdam, Utrecht and The Hague, the investment is often recovered within 5 years through rental income.

archi.sulerr.com delivers the complete design and permit package for house splitting — from feasibility assessment to permit-ready drawings for two self-contained residential units.