House Extension Structural Engineer
Professional structural engineering for house extensions, loft conversions, and any new builds. All our drawings are guaranteed building control approval with competitive pricing and guaranteed fast turnaround.
24-Hour Quote Response
Get your structural engineering quote within 24 hours. No waiting weeks for a response – we understand your project timeline matters.
Quick Service
Efficient structural design process with regular updates. We keep your project moving forward without unnecessary delays
Fixed Price Guarantee
No hidden costs or surprise fees. The price we quote is exactly what you pay – transparent pricing you can trust and budget for
Structural Engineer Costs in 2025
Understanding structural engineer costs in 2025 helps you budget effectively for your extension project. AC Design Solution offers transparent pricing for all structural engineering services:
SINGLE STOREY
FROM
Complete structural calculations and drawings for ground floor extensions, kitchen expansions, and single-level additions to your home.
Loft Conversions
FROM
Professional structural assessments to transform your loft space into functional living areas with proper load-bearing calculations.
DOUBLE STOREY
FROM
Comprehensive structural design for multi-level extensions requiring complex load calculations and building regulations compliance.
BASEMENTS
INDIVDUAL
Specialized structural engineering for basement conversions, underpinning, and below-ground extensions requiring expert foundation work.
CALL US TODAY ON 020 8152 4006
Why Choose AC Design Solution for Your House Extension
12 Years Experience
Complex structural engineering projects with proven track record
Value Engineered Solutions
Optimized designs that reduce costs without compromising structural integrity
Complex Extension Projects
Basement conversions, multi-storey extensions, and challenging structural modifications
Fast Service
Client Stories
Don’t just take our word for it – hear directly from satisfied clients about their experience working with us. These real stories demonstrate why businesses trust us to deliver outstanding results every time
Ready to Remove a Load Bearing Wall?
Tell us about your project and we will get back to you with the structural drawings and calculations you need to get the job done safely and on time.
House Structural Engineering Services for Extensions
AC Design Solution delivers comprehensive structural engineering for house extensions across the UK. Our experienced team provides complete structural calculations and drawings, Building Regulations compliance documentation, and load-bearing wall assessments as standard. We offer a wide range of structural engineering services to suit every project type and budget.
Ready to hire a structural engineer? Contact us for your free consultation. View our full structural engineering services or explore our structural drawings and calculations in detail.
Single Storey Extension Structural Engineering
Professional structural calculations for single storey extensions. Our service covers foundation design and calculations, load-bearing wall removal assessments, and a full Building Control submission package. We also carry out a structural inspection during construction. Fixed-price quotes are provided and most projects turn around in 1 to 2 weeks.
How Much Does a Structural Engineer Cost
Understanding structural engineer costs in 2025 helps with accurate budgeting for your extension project. AC Design Solution offers transparent, fixed-price quotes with no hidden costs.
Single storey extensions start from £400. Double storey extensions start from £800. Loft conversions start from £500. Load-bearing wall assessments start from £350. Complex extensions are quoted individually.
What Affects Structural Engineer Cost
The price depends on the complexity of the project and the structural changes required. Structural surveys, inspection needs, load-bearing wall removal modifications, and removing a chimney or major structural alterations all affect the final fee. Ground conditions, foundation requirements, and whether the project is residential or commercial also play a role.
Structural Surveys
AC Design Solution provides comprehensive structural survey London services for homeowners requiring detailed structural assessments. Our qualified surveyors and local structural engineers work together to deliver thorough inspection services for existing buildings and proposed extensions.
When You Need Structural Surveys
A structural survey is recommended before purchasing a property with possible structural issues. It is also advisable before major home renovation projects or following damage from signs of subsidence or settlement. We also provide full basement impact assessments where excavation or lower ground floor works are proposed.
Where projects involve earth retention, our team designs retaining walls to full structural engineering standards. For chimney removals, see our guide on the cost to remove chimney breast.
STRUCTURAL ENGINEERING
Double Storey Extension Structural Engineering
Expert structural design for double storey extensions. We carry out complex load calculations, foundation assessments, and full structural frame design. Our team coordinates architect and a structural engineer throughout the project. We ensure full Building Regulations compliance with competitive pricing for all project sizes.
GET FREE QUOTESTRUCTURAL ENGINEERING
Loft Conversion Structural Calculations
Specialist loft conversion structural engineering. We assess the existing structure, carry out floor strengthening calculations, and design roof modifications with structural integrity in mind. Staircase structural specifications are included as standard. Every project comes with a complete Building Control package and structurally sound solutions guaranteed.
GET FREE QUOTESTRUCTURAL ENGINEERING
Rear Extension Structural Engineering
Fast, reliable structural design for rear extensions. Our service covers foundation design, structural steelwork specifications, and connection details. We work closely with building contractors throughout to ensure designs are practical and buildable on site.
GET FREE QUOTESTRUCTURAL ENGINEERING
Side Return Extension Structural Engineering
Maximise your space with professional structural design. We are Victorian terrace specialists with proven space optimisation expertise. Our service includes complete structural calculations and Building Control liaison. Our in-house structural engineer team means you get direct access to the engineers responsible for the design from day one.
GET FREE QUOTESTRUCTURAL ENGINEERING
Wrap Around Extension Structural Engineering
Complex extension projects handled expertly. We take on large-scale residential extensions with comprehensive structural assessments and detailed design coordination. Full project support is provided throughout, with competitive pricing for major projects.
GET FREE QUOTEOur Process
House Extension Structural Engineering Process
Free Consultation
We discuss your extension requirements. You will then receive a fixed-price quote.
Structural Design
We produce a structural design package including complete calculations and detailed construction drawings. All Building Regulations documentation is included for structural element only.
Building Control Submission
We submit your application and liaise directly with Building Control. Any queries are addressed quickly.
Construction Support
We provide contractor guidance and carry out an inspection service during construction. Ongoing technical support is available at every stage.
Start your project today – Contact AC Design Solution now.
Concerns
Neighbouring property owners often have genuine concerns about noise, damage, disruption, and what happens if something goes wrong. A properly drafted award addresses all of that. It sets out protections before work starts so there’s no argument about liability afterwards.
Housing Structural Engineering FAQ
“Planning a home extension? Our FAQ section addresses the key questions homeowners ask about structural engineering requirements, costs, timelines, and design processes to help you make informed decisions about your project.”
Q. What do you need from me to start my extension project?
Yes, most house extensions require structural engineering calculations to comply with Building Regulations. You’re likely to need a structural engineer when your extension involves new foundations, making structural changes, or significant loads on your existing building.
A structural engineer can provide the necessary calculations and drawings required by local building control. Structural engineers can also carry out a structural feasibility review early on. This confirms whether your proposed scheme is viable before architectural drawings are finalised. When building an extension, engineers don’t just design they ensure the stability of the building and structural integrity throughout the entire project.
How much does a house extension structural engineer cost?
Our house extension structural engineer costs start from £800 for simple single storey extensions. Double storey extensions typically cost from £1,200. Loft conversions start from £900. The structural engineer’s cost depends on the complexity of the project and any specific structural issues involved.
All fees include complete structural calculations, drawings, and Building Control documentation. We provide structural engineering services with transparent pricing so projects don’t cost a lot more than expected with hidden fees.
How long do extension structural calculations take?
Most extension structural calculations are completed within 1 to 2 weeks of instruction. Simple single storey extensions may be completed faster. Complex projects requiring structural surveys or structural damage assessments may require up to 3 weeks.
Our structural engineer’s expertise ensures calculations are thorough and accurate. We provide realistic timescales during your initial consultation and keep you informed throughout your building works.
What do you need from me to start my extension project?
We need your architectural design drawings or detailed sketches showing the proposed layout and dimensions. Information about your existing building construction is helpful. Previous structural reports or building survey details are also useful if available.
A structural inspection may be required for complex extensions or where possible structural issues are unclear. An engineer may also need to carry out a site visit before work begins. We will discuss all requirements during your free initial consultation and provide a clear checklist for your home renovation project.
Expert Structural Engineering Advice
What Is Subsidence and Signs of Subsidence?
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