Most people reach us with a practical question: “Do I need structural calculations for my extension?”, “Is this crack serious?”, or “Can I remove this wall?” Choose the route closest to your situation.
Planning an extension, loft conversion, new build or wall removal? You will usually need structural calculations and drawings for building control. Our structural engineers design the beams, foundations and supports your project needs.
Structural Design Services
Cracks, sagging floors, bulging walls or movement in an older property? An independent structural survey diagnoses the cause and gives you a clear report with practical recommendations before you buy or repair.
Structural Survey Services
That is completely normal. Send us your drawings, a photo of the problem, or a short description of your project and we will tell you exactly what is required and what it will cost.
Speak to an EngineerWe are a London-based structural engineering consultancy working with homeowners, architects, contractors and developers across the capital and throughout the UK.
We provide two core services, structural design and structural surveys, and manage each one from first enquiry through to completion. We review what your project needs, produce safe and buildable solutions, and make sure everything complies with UK Building Regulations and relevant British Standards.
You do not need to understand structural engineering before you call. That is what we are here for. We explain what your project requires, what it does not, and what happens next, in clear, practical language, with a transparent quote before any work begins.
Speak to a Structural Engineer in London
Our structural design service covers the analysis and design of the elements that hold a building up, including beams, columns, foundations, lintels and connections. We prepare the structural calculations and drawings needed for extensions, loft conversions, new builds, steel (RSJ) beams, load-bearing wall removals and reinforced concrete, so your project is safe to build and ready for building control approval.
Explore Structural Design
Our structural survey service provides an independent engineering assessment of a property’s condition. We inspect the building, establish the cause of any cracking, subsidence, movement or defects, and set out clear, practical recommendations in an easy-to-understand report, helping you make informed decisions before you buy, renovate or repair a property in London.
Explore Structural SurveysMany homeowners assume planning permission or an architect’s drawings are enough. In reality, most projects that alter how a building carries load need structural calculations from a qualified structural engineer before building control will approve them.
If your works involve removing or altering a load-bearing element, adding weight, or building something new, a structural engineer designs the supports that keep the building safe.
If you are unsure, the safest first step is to have the proposed works reviewed before you start.
See If You Need Calculations
Decided by your local council, this controls what a building looks like and its impact on the area. It does not confirm your structure is safe, that is a separate assessment.
Set the safety and performance standards a build must meet. Structural calculations from an engineer are what demonstrate the structure complies before work is signed off.
The engineer’s calculations and drawings that size beams, columns and foundations. Your builder and building control use these to construct and approve the works.
London’s housing stock is unusually demanding for structural work. Victorian and Edwardian terraces, converted flats, and homes with shared party walls all react differently when you extend, convert a loft or remove a wall, and the close proximity of neighbouring buildings adds complexity.
Many of the most popular home improvements in London have significant structural implications. A loft conversion often means inserting steel beams into existing walls; a rear or side-return extension usually requires new foundations and large openings; and basement projects involve underpinning and careful control of the loads on adjoining structures.
Older properties also bring their own issues, including historic cracking, bowing walls, sagging floors and past alterations that were never properly designed. A structural engineer establishes what is happening, why, and what needs to be done.
At LENIO Consultants, we help homeowners, architects and developers across London with structural calculations, structural surveys, and clear engineering advice, so projects proceed safely and pass building control first time.
Talk to the LENIO TeamWhether you own a Victorian terrace in South London, a conversion flat in the East, or a new build near a shared boundary, the same engineering principles keep your home safe.
From a single set of calculations to a full structural survey, our London structural engineers cover the residential and commercial projects homeowners, architects and developers rely on.
Building-control-ready calculations and drawings for extensions, loft conversions, openings and alterations, checked by two engineers before issue.
Get CalculationsBeam and foundation design for rear, side-return and wrap-around extensions and loft conversions, including steel (RSJ) sizing and new openings.
Design My ExtensionSafe design for removing walls and chimney breasts, sizing the steel beams and supports needed to open up your London home.
Remove a Wall SafelyIndependent inspections and reports on cracking, movement, subsidence and defects, with clear recommendations before you buy or repair.
Book a SurveyStructural design for basement excavations, underpinning and new or strengthened foundations, protecting your home and its neighbours.
Basement AdviceFull structural engineering for new builds, developments and commercial projects, from foundations to steel and reinforced concrete frames.
Discuss a ProjectAs your structural engineers in London, LENIO manages every stage. From the first enquiry to building-control sign-off, we keep you informed and the project moving.
Send us your architect’s drawings, a description of the works, or photos of the problem. If your plans are still developing, we can still advise on what you will need.
We confirm exactly what structural design or survey work is required and provide a fixed, transparent quote, with no obligation, before anything starts.
Where an inspection or survey is required, we arrange a site visit to assess the property, take measurements and record the existing conditions our engineers need before the work begins.
We complete the structural analysis, calculations or survey to UK design standards, using sound engineering judgement and a multi-stage quality check.
We issue clear, building-control-ready drawings and calculations, or an easy-to-understand survey report, ready for the next stage of your project.
We provide structural design and survey services right across the capital and the surrounding counties. Choose your area for local structural engineering advice.
Covering Camden, Islington, Haringey, Barnet and Enfield, with experience of the area’s Victorian terraces and loft conversions.
North London Structural EngineersCovering Croydon, Lambeth, Southwark, Wandsworth and Bromley, including clay-soil subsidence and period-home movement.
South London Structural EngineersCovering Hackney, Tower Hamlets, Newham, Stratford and the Docklands, including warehouse and flat conversions on made ground.
East London Structural EngineersCovering Ealing, Hammersmith & Fulham, Chiswick, Kensington and Hounslow, including period facades, basements and value engineering.
West London Structural EngineersCovering Westminster, the City, Fitzrovia, Bloomsbury and Mayfair, including listed buildings, mansion blocks and commercial fit-outs.
Central London Structural EngineersSee every area we cover across Greater London and the South East, with the same chartered-standard advice throughout.
View All Areas
The Institution of Civil Engineers (ICE)
The Chartered Association of Building Engineers (CABE)LENIO Consultants is led by chartered professionals with extensive experience advising homeowners, architects and developers on structural design and structural surveys throughout London.
With a strong technical background in structural engineering and building construction, we combine technical rigour with a practical, buildable approach, and check every design before it is issued.
Whether you are planning a loft conversion, extension, basement or structural repair, our team provides expert guidance and a straightforward service from start to finish.
Contact LENIO Consultants for professional advice and a no-obligation quote for your project.
Call LENIO TodayWhatever stage you are at, there is a guide for it. Browse by where you are starting, the project you are planning, or the problem you are trying to solve.
New to structural engineering? Start here for the essentials: when you need calculations, how the process works, and what it costs.
Start With the Basics →Planning specific works? These guides cover extensions, loft conversions, wall removals and basements, step by step.
See Guides by Project →Worried about cracks, subsidence or movement? Understand what your survey covers and what the findings mean.
Understand a Defect →The first conversation helps you understand your position and your costs, with no pressure and no obligation.
Whether you are planning building work, worried about a defect, or simply need to know if you require a structural engineer, our team is here to help. You do not need all the answers before you call.
Share your drawings, photos or a short description of the works. Even at an early stage, we can advise on what is required and provide a fixed quote.
We explain exactly what your project needs, what it will cost, and the best next step, in clear, practical language, so you can move forward with confidence.
Trusted by homeowners, architects and developers across London.
Useful official resources: the GOV.UK Building Regulations guidance, the Institution of Structural Engineers, and the Institution of Civil Engineers.
Planning building work, or worried about a defect? Get clear, practical, no-obligation advice and a fixed quote from LENIO Consultants’ chartered structural engineers. We cover the whole of London.
