House Extensions
Structural Engineering For House Extensions
Planning a house extension? Pavol Zajac Structural Engineers Ltd provides the structural design, drawings and calculations needed to turn your plans into a safe, buildable extension.
We work with homeowners, architects and builders on extensions of all sizes, providing clear structural information for Building Regulations and construction.

We can provide structural engineering for:
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Single-storey extensions
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Double-storey extensions
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Rear and side extensions
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Kitchen extensions
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Open-plan extensions
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Extensions requiring steel beams or RSJs
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New openings between existing and extended areas
We Provide
Structural Calculations
For beams, columns, foundations and other structural elements.
Structural
Drawings
Clear structural information showing how the proposed extension should be constructed.
Steel Beam & RSJ Design
Where new openings or structural support are required.
Foundation Design
Structural design for the foundations supporting the extension.
Need Structural Calculations?
Structural calculations may be required for beams, foundations, columns and other structural elements within your extension. These calculations help demonstrate that the proposed structure can safely support the required loads and provide the technical information needed for the project.

1. Tell Us About Your Project
Send us details of your proposed extension and any drawings already available.
2. We Review The Design
We assess the proposed extension and existing structure.
3. We Design The Structure
We prepare the required structural drawings and calculations.
4. Your Project Can Progress
Your structural information can be used by your builder and Building Control.
Why Choose Pavol Zajac Structural Engineers?
Residential structural engineering specialists
Practical, buildable engineering solutions
Experienced in extensions, loft conversions and structural alterations
Work closely with architects and builders
Detailed structural drawings and calculations
Competitive quotations, clear communication & reliable turnaround times
Balint Lazar
Pavol acted as the structural engineer on our loft conversion. He has done a great job and he has worked together with both our architect and builder very smoothly. During the build, an unexpected issue came to light and Pavol was immediately available to advise and managed to resolve this with the builder. We plan to use him again for our next project.
Andy Stuart
I can't recommend Pavol highly enough. Unlike most we contacted he actually had an interest in assisting us. He dealt with our enquiries promptly and explains things in a way non-professionals easily understand. Great advice and an absolute pleasure to deal with. I will refer him to all of my friends.
Daniel Greaves
Pavol is a one of a kind quality structural engineer. He has done some fantastic work for us in the past and continues to excel himself. With his great attention to detail, ideas and planning we’ve been able to get some great plans done and save tons of money in the process. We’d recommend at all times!
House Extension FAQs
1. Do I Need A Structural Engineer For A House Extension?
A Structural Engineer may be required where an extension involves structural elements such as foundations, steel beams, columns, new openings or changes to the existing structure. The exact requirements will depend on the project.
2. What Structural Calculations Are Needed For An Extension?
This depends on the design, but calculations can include beams, columns, foundations and other load-bearing elements. We provide the calculations required for the structural elements within your project.
3. Will I Need Structural Drawings For Building Regulations?
Structural drawings and calculations are commonly required to demonstrate how the structural elements of an extension will be constructed and supported. We provide the structural information needed for your project.
4. Can You Work With My Builder or Architect?
Yes. We can work alongside your architect, designer or builder to provide the structural design, drawings and calculations required for the extension.

