Principal designer for construction projects

In Finland, the Principal Designer, also Architect of Record, plays a central and legally required role in construction projects. For international clients, the right principal designer is also a key commercial decision: it directly affects permitting speed, project risk, and overall delivery certainty.

As an experienced Finnish architectural practice, we act as Principal Designer for domestic and international clients, ensuring that design intent is realized efficiently within Finnish legislation and authority processes.

This page explains the legal framework for the Principal Designer’s role, why a Finnish principal designer adds concrete value, how third-party qualification verification affects international projects and how we at Laitila Architects support smooth and predictable permitting.

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Pääsuunnittelu

Legal basis: why is a principal designer required?

The current requirement for a principal designer is set out in the Finnish Building Act (Rakentamislaki 751/2023), which entered into force on 1 January 2025. The Act requires that a construction project subject to a building permit must have a qualified principal designer appointed by the party undertaking the project.

The suitability and qualifications of the principal designer are assessed on a project-by-project basis. Under the Building Act, professional qualifications must be verified by an independent third-party assessor in accordance with the national qualification framework. Final approval of the principal designer is always given by the local building control authority.

Why is a principal designer needed?

The principal designer is not responsible for producing individual drawings. Instead, their key task is to lead and coordinate the entire design process.

The principal designer is responsible for:

coordinating different design disciplines (architecture, structural, HVAC, electrical, etc.)
ensuring that all designs comply with applicable laws, regulations and zoning requirements
preventing conflicts and inconsistencies between design solutions
acting as the primary point of contact with the local building authority

Well-managed principal design reduces errors, shortens the permitting process, and lowers overall project risk.

Can a foreign professional act as a principal designer in Finland?

In principle, a foreign professional can act as a principal designer in Finland, but this involves strict requirements and practical challenges.

The local building authority assesses eligibility case by case. In addition, the principal designer’s qualifications must be verified by an independent third-party assessor recognized under Finnish legislation. A foreign principal designer must be able to demonstrate that they:

meet the qualification requirements applicable in Finland
have sufficient knowledge of Finnish building legislation and regulations
can manage authority communication in Finnish or Swedish
are accepted by the local building control authority

In many municipalities, foreign principal designers are approved only in exceptional cases or on the condition that a Finnish responsible designer is also involved.

Why is a Finnish principal designer often the best solution?

For international projects, appointing a Finnish principal designer is one of the most effective ways to reduce risk, protect the schedule, and secure permitting certainty.

Under the Finnish Building Act, professional qualifications must be verified by an independent third-party assessor. Navigating this process without local experience often leads to delays and additional clarification rounds.

Key commercial advantages of a Finnish principal designer include:

immediate alignment with the Finnish qualification and approval system
established working relationships with recognized third-party assessors
practical understanding of how authorities interpret regulations
early identification of permitting risks before they affect the design

A proven and efficient delivery model is:
international concept architect or design lead + Finnish principal designer.

This allows full design ambition while ensuring regulatory compliance and smooth authority coordination.

The value of local knowledge

Personal and local knowledge brings significant benefits that go beyond legislation.

A locally experienced principal designer understands:

local interpretations of zoning regulations
municipal urban design and architectural objectives
working practices and expectations of the building authority
which solutions have previously been accepted or rejected

This knowledge helps avoid unnecessary redesign and can save substantial time during the permitting phase.

How Finnish expertise supports smooth permitting

Building permits in Finland are not purely technical approvals, but interactive administrative processes.

A Finnish principal designer:

understands the culture and responsibilities of public authorities
knows when and how to engage in pre-application discussions
responds efficiently to requests for additional information
ensures that documentation meets authority expectations

In practice, this results in faster permit decisions and a more predictable project timeline.

Rakennusluvat

Get building permits faster

Did you know that processing a building permit application may take anywhere between 4 and 30 weeks depending on the city and municipality? If your planning materials are not extensive enough, it can add months to the waiting time.

An expert principal designer manages the permit process for you and makes sure that the planning materials of your project meet the Building Control quality requirements. This expedites the permit process and reduces the need for providing additional materials afterwards.

Your principal designer also makes sure that the end result matches the goals and wishes you had set for the project.

FAQ – Principal Designer Services in Finland

Is a principal designer mandatory in Finland?

Yes. Under the Finnish Building Act (Rakentamislaki 751/2023), a qualified principal designer is mandatory for construction projects that require a building permit.

Who verifies the principal designer’s qualifications?

Qualifications must be verified by an independent third-party assessor in accordance with the national qualification framework. Final approval is always given by the local building control authority.

Can a foreign architect act as principal designer?

In principle, yes. However, the architect must meet Finnish qualification requirements, pass third-party verification, and be accepted by the local authority. In practice, this is often time-consuming without a Finnish partner.

Do we still need a Finnish principal designer if we have an international lead architect?

Yes – and this is often the most effective solution. The Finnish principal designer manages compliance, permitting, and authority coordination, allowing the international architect to focus on design quality.

When should a principal designer be appointed?

As early as possible. Early involvement allows permitting risks to be identified and resolved before they impact design development, cost, or schedule.

What is the commercial benefit for the client?

A Finnish principal designer reduces permitting uncertainty, avoids redesign, shortens approval timelines, and provides a clear point of responsibility throughout the design process.

Summary

The principal designer is the legal and operational backbone of a construction project in Finland.

By appointing a Finnish principal designer, clients gain:

faster and more predictable permitting
reduced regulatory and schedule risk
seamless authority communication
a clear and accountable design leadership structure

For international projects, this role is often decisive in turning design intent into a successfully permitted and delivered building.