Insights & Technical Guides
Clear, practical structural guidance for London property. Our guides explain how structural engineers diagnose movement, when defects need action, and how Building Regulations, surveys and engineering-led repairs work in plain English.
Structural engineering insights for London property
Honest, engineering-led answers to the questions homeowners, buyers, landlords, businesses and property professionals ask us most often.
Is My New-Build Wonky? Acceptable Tolerances
Sloping floors and leaning walls: what deviation is normal versus a defect, how it is measured against tolerances, and when it is actually structural.
Basements & Below-GroundBasement Waterproofing Types Explained
The three BS 8102 methods, tanking, waterproof concrete and drained cavity systems, the dryness grades, and why the design matters more than the product.
Extensions & FoundationsTying an Extension Into an Existing House
Why extensions crack at the join, how differential movement works, and the key decision: match the foundations and tie in, or keep the new part independent.
Cracks & MovementWall Tie Failure and Bulging Walls
Why corroding cavity wall ties crack brickwork in regular horizontal lines and bow walls outward, the signs, and how failed ties are repaired.
Foundations & GroundBuilding Foundations Near Trees on Clay
Why foundations near a tree on shrinkable clay must go deeper, the four things that set the depth, and why felling the tree brings its own risk of heave.
Alterations & RepairsChimney Breast Removal and Unsafe Stacks
What a chimney breast holds up, how it is supported once removed, the Building Regs and party wall rules, and the 4.5x rule for a leaning stack.
Commercial & AgriculturalIndoor Riding Arenas in the UK: Size, Height and Planning
How to size an indoor school, the clear height most buyers get wrong, why equestrian buildings rarely count as agricultural, and steel vs fabric compared.
Commercial & AgriculturalSalt and Grit Storage Buildings in the UK
Why salt destroys ordinary steel buildings, what a salt store has to do, how push walls should be designed, and steel portal frame vs fabric compared.
Fabric StructuresPortal Frame Buildings: Costs, Uses and the Fabric Alternative
How portal frames work, what drives the cost in the UK, and when an engineered fabric building is the faster, brighter clear-span alternative.
Cracks & MovementTypes of Cracks in Walls and What They Mean
Vertical, diagonal, horizontal and hairline cracks explained with an illustrated guide to what each pattern means and when to worry.
Fees & CostsHow Much Does Subsidence Repair Cost in London?
The four cost stages of subsidence repair: diagnosis, investigation, fixing the cause and underpinning, with 2026 figures and the insurance route.
Fees & CostsHow Much Does a House Extension Cost in London?
Typical 2026 London costs per square metre for single storey, side return and two storey extensions, plus an instant cost calculator.
Fees & CostsHow Much Does a Structural Engineer Cost in London?
Real 2026 fees: advice visits, inspections with reports, wall removal calculations, loft and extension packages, and what moves the fee.
Fees & CostsHow Much Do Basements and Underpinning Cost in London?
Real design-and-build rates: basement construction per square metre, underpinning per metre run, and the factors that move the price.
Loft ConversionsDormer vs Rooflight Loft Conversions
The four loft conversion types compared, how dormer and rooflight differ, and the structural work each one needs in a London home.
Updated Ground & Site InvestigationContaminated Land: What You Need to Know
What contaminated land means, the source-pathway-receptor model, and when it affects buying, building or digging a basement.
Retaining WallsDo You Need a Structural Engineer for a Retaining Wall?
The height where a garden wall becomes an engineering job, plus the drainage, surcharge and planning factors that decide it.
Updated Property SalesHomebuying Reforms and Pre-Sale Structural Surveys
Why sellers, estate agents and conveyancers may benefit from early structural engineer input where cracks, movement or previous alterations could delay a sale.
Updated SubsidenceSigns of Subsidence in London Homes
How to spot subsidence early, the warning signs that matter and what to do next.
CracksWhen Are Cracks Structural?
How engineers tell harmless settlement cracks from structural cracks that need action.
FoundationsBasement Extension Structural Requirements
Underpinning, retaining walls and waterproofing: the structural design a basement needs.
Structural EngineeringLoad-Bearing Wall Removal Explained
Beams, calculations, Building Control and temporary works for removing a wall safely.
UnderpinningUnderpinning: When Is It Needed?
When underpinning is genuinely required, when it is not, and the alternatives.
Building RegulationsDo I Need Structural Calculations for Building Regulations?
Which alterations need structural calculations and how Building Control approval works.
Structural SurveysStructural Survey vs Building Survey
The difference between the two, and which report you actually need before you buy.
Structural SurveysTrial Pits and Opening-Up Works Explained
Why intrusive investigation is sometimes needed to diagnose foundations and movement.
Structural RepairsEngineering-Led Structural Repairs Explained
Why repairs should follow diagnosis and a repair specification, not guesswork.
Construction SupportPrincipal Designer Duties Explained
What the Principal Designer role involves under the CDM Regulations and who needs one.
Our guides span Structural Engineering, Building Regulations, Structural Surveys, Cracks, Subsidence, Foundations, Underpinning, Structural Repairs, Construction Support and Calhoun / Fabric Structures.
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