Raft Foundation Design
Raft foundations are ideal for sites with poor ground conditions or where traditional strip foundations aren’t suitable. At Loft Designs, we offer professional raft foundation design calculations for domestic projects, ensuring structural stability and full compliance with Building Control requirements.
We design raft foundations for:
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New build dwellings
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House extensions on soft or variable ground
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Basement structures and refurbishments
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Sites with low bearing capacity or made ground
What’s Included in Our Raft Foundation Design Pack?
Our engineering team use your architectural plans and ground investigation data to deliver accurate, tailored raft foundation solutions.
Each design includes:
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Structural thickness and reinforcement layout
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Bearing pressure checks and load distribution
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Concrete and steel specification
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Uplift and punching shear analysis (if applicable)
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PDF format, ready for Building Control submission
Why Choose Beam Designs for Raft Foundation Calculations?
We make complex ground conditions easier to manage with clear, compliant designs. Our digital-first service delivers quick turnaround, professional documentation, and reliable engineering support from start to finish.
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Fast, affordable raft design service
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Calculations tailored to your site and structure
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Compliant with British Standards and Eurocodes
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Delivered in digital format for easy approval and on-site use
Designed for Builders, Architects & Homeowners
Whether you're an architect designing a foundation system, a builder needing calculations for a retaining wall, or a homeowner managing a domestic project, Loft Designs is your go-to partner for raft foundation design.
We use advanced structural engineering software and provide clear, buildable solutions that integrate seamlessly into your project.
*Prices are for guidance only. Final cost depends on the scope of work, site size, and location.
Bespoke Steel, Timber & Concrete Beam Calculations For Building Control Approval
Steel Beam Calculations
We provide accurate and fully compliant steel beam calculations to ensure your build is safe, efficient, and approved by Building Control.
Whether you're:
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Supporting a new extension or loft conversion
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Reinforcing openings for windows or doors
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Installing steel beams for open-plan layouts
Our steel beam calculation services are tailored to your specific project, with precise, easy-to-follow designs for builders and architects.
Timber Beam Calculations
Timber is a popular, cost-effective choice for domestic construction, especially in loft conversions, roof structures, and internal alterations. At Loft Designs, we provide accurate and Building Control-approved timber beam calculations to ensure your project is structurally sound from the start.
Whether you’re:
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Constructing timber floors or flat roof structures
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Altering internal layouts with timber supports
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Building a timber-framed extension
We deliver clear, engineer-backed timber calculations in PDF format, ready for submission to Building Control and easy for builders to follow on site.
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Concrete Beam Calculations
Concrete beams are often used where strength, durability, and fire resistance are essential—especially in new builds, basements, and multi-storey extensions. At Loft Designs, we provide accurate concrete beam calculations to ensure structural stability and full Building Control compliance.
Whether you're:
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Constructing reinforced concrete floors or lintels
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Supporting masonry or upper-storey loads
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Designing bespoke concrete framing for new developments
We deliver clear, engineer-reviewed calculations in digital PDF format, suitable for Building Control submission and contractor use on site.
We deliver reliable solutions for residential loft conversions, attic conversions, home extensions, and internal alterations
Structural Calculations Suitable for Part A Building Regulation Submissions
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40+
Backed by over 40 years of structural engineering experience
50+
Team members enabling engineering across the UK
1000+
Residential, commercial & industrial projects nationwide
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quick and easy online structural calculations service
What Our Clients Say
A Fair Price
Always helpful, punctual delivery of designs & at a fair price. A pleasure to be associated with Loft Designs.
Brooks Building Plans
Helpful and Efficient
Loft Designs have been working on my projects for over 8 years, they are extremely helpful and efficient in finding cost effective structural solutions to my architectural projects.
Tony Angeletta Architect
Cannot Fault their Service
I have worked with Loft Designs for a couple of years now and cannot fault their service. They are always happy to help and I look forward to working with them going forward.
Steven C.
This is a very reliable & professional…
This is a very reliable & professional company with excellent service and very prompt in providing assistance !
L.Bin
Loft Designs A+
I have used Loft Designs on many projects and on each time they have delivered both in quality and costs. They always happy to help with any queries. I would highly recommend.
Bobyas
Professional & Knowledgeable
I couldn't be more happy with the service received from Loft Designs. From start to finish, their team was professional, knowledgeable, and attentive to every detail.
Mr. J. Snitzer
Practical, Cost-Effective
Finding a structural engineer who truly understands the needs of our community isn’t easy, but Loft Designs does exactly that. Their experience with local properties and commitment to delivering practical, cost-effective solutions makes them the go-to choice for structural design.
S. Oppenheimer
Smooth & Stress-free
After researching several companies for our loft conversion project, we decided to go with Loft Designs, and we're so glad we did. Their expertise in structural engineering and their solutions made the entire process smooth and stress-free.
M.Reece
Incredibly Easy
Loft Designs made the experience of a loft conversion less stressful. They provided a design which ensured it was structurally sound and compliant with all regulations.
T.Syed
Frequently Asked Questions
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How do I know if my property is suitable for a loft conversion?Determining the suitability of your property for a loft conversion involves several factors: roof space, roof structure, planning permissions, building regulations, access, budget and timeframes. Loft Designs are loft conversion specialists who can provide professional advice tailored to your specific property and requirements.
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Do I need planning permission for a loft conversion?In many cases, loft conversions in the UK can be carried out under permitted development rights, which means planning permission may not be required. Homeowners in England can often proceed with a loft conversion without the need for planning permission, as long as certain criteria are met.
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What structural changes are involved in a loft conversion?A loft conversion typically involves several structural changes to transform the unused attic space into a functional living area. This can include (but is not limited to): Roof Structure Modification, Floor Reinforcement, Staircase Installation, Window and Door Openings, Insulation and Ventilation, Electrical and Plumbing Work and Structural Integrity. Our team may need to assess load-bearing walls, beams, and foundations, and to design appropriate structural modifications as needed.
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How can Loft Designs help me with my loft conversion?Loft Designs provides expert loft conversion solutions. Our team of structural engineers provide comprehensive structural calculations for your loft conversion project, ensuring safety and compliance every step of the way.
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Will my loft conversion comply with building regulations?Ensuring that your loft conversion complies with building regulations is crucial for safety, structural integrity, and legal compliance. Building regulations require that any structural alterations or additions, such as roof modifications and floor reinforcement, meet specified standards for strength, stability, and load-bearing capacity. Loft Designs provide structural calculations and designs to ensure compliance.
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How much does Loft Designs service cost?Loft Designs provides cost-effective structural calculations for your loft conversion project. Prices start from £600.
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How can I contact your team?Loft Designs is a web-based, online service. To contact a member of our team, please use the website contact form. Alternatively, email info@loft-designs.co.uk and we will get back to you as quickly as possible.
Loft Designs is an online service, offering structural calculations for loft conversions across the UK.