Homeowners
Plan your extension or loft conversion with confidence
- Steel beam (RSJ) calculations for knocking through walls
- Loft conversion and house extension design
- Structural surveys for cracks and movement
- Plain-English advice, no jargon
Innovative. Cost‑effective. Sustainable.
Consulting structural engineers in Surrey and London
Structural calculations, drawings and surveys for extensions, loft conversions, steel beams, new builds and commercial projects. Our experienced engineers design safe, buildable structures, with a clear written quote within 24 hours.
Steel beams & wall removalSteel beams & wall removalRSJ design for open-plan living
Loft conversionsLoft conversionsFloors, beams and roof structure
House extensionsHouse extensionsFoundations, steelwork and roofs
Structural surveysStructural surveysCracks, movement and reports
Basements & underpinningBasements & underpinningSequenced design and temporary worksGet in touch
Tell us about your project and an engineer will get back to you within 24 hours on working days.
Structural engineering services in Surrey and London
Steel beam (RSJ) calculations
Structural calculations and drawings for beams, foundations, floors and roofs to Building Regulations Part A.
Learn more →
Loft conversion and extension design
Structural design for loft conversions, extensions and new builds, coordinated with your architect.
Learn more →Structural reports and surveys
Structural surveys and reports for cracks, movement, subsidence and pre-purchase concerns.
Learn more →
Temporary works
Propping, underpinning, hoarding, method statements and party wall support.
Learn more →
Drainage design
Below-ground drainage design, soakaways and SuDS for planning and building control.
Learn more →How it works
From first call to finished design in four simple steps
- 1
Get in touch
Call, WhatsApp, email or use the form. We reply within 24 hours.
- 2
Approve your quote
You see exactly what is included before any work starts.
- 3
Site inspection
An engineer visits, usually within 3 to 5 working days.
- 4
Design delivered
Calculations and drawings, typically 10 to 12 working days later.
Our track record
Trusted on over 1,500 projects across Surrey and London
- 1,500+Projects completed
- 300+Extensions, lofts and refurbishments
- 1,000+Steel beams designed
- 2,000+Site visits carried out
- 98%Customer satisfaction rate
Our work
Recent structural engineering projects we are proud of
A selection from more than 1,500 projects for homeowners, architects, builders and churches across London and the South East.
BerkhamstedTwo-storey rear extension, single-storey side extension, chimney stack removal at ground floor level.Read More →
HampshireLoft conversion and a single-storey rear extension to a timber frame house.Read More →
Chelsea LondonSingle-storey rear extension to a flat at high rise building.Read More →
Bromley ChurchConceptual design to a Church.Read More →
Catherine Place LondonFive-storey including basement office building conversion to residential units, Loft conversion, Report on existing lift and re-location of lift.Read More →
Connaught Rd FleetPart two, part single-storey rear & side extension.Read More →
LondonSingle-storey rear extension & internal alteration.Read More →
HitchinSingle-storey rear extension & internal alteration.Read More →
St. AlbansSingle-storey rear extension & internal alteration.Read More →
New-build LutonTwo-storey new build dwelling.Read More →
Empire Building DartfordSingle-storey rear & side extension & internal alteration to a restaurant.Read More →
St. Augustine ChurchSingle-storey side extensions at St. Augustine Church.Read More →
BedfordshireExisting barn conversion and extension.Read More →
Hitchin HertfordshireLoft conversion and a single-storey rear & side extension.Read More →
ReadingCreating living space within existing roof loft.Read More →1,500+projects delivered. Yours could be next.View all projects →Testimonials
Client Says
“I would now recommend you above them because you are very reliable and provide an excellent customer service.”
I have recently started working with Surrey Hills Engineering. As an architectural designer, I have been.. Read more
Lawtey Design Architectural Services
“within 24 hrs I had the new calculations emailed to me which I could then forward to building control”
I would like to thank you & your company for your help and speedy structural calculations ready for the very next day.. Read more
GB Build Ltd
“I feel in safe hands with you and I would have absolutely no hesitation in recommending Surrey Hills Engineering”
I wanted to put in writing my appreciation for your speedy and efficient service in producing the structural.. Read more
Raymond James Investment Services
Who we help
Structural engineering for homeowners, architects and builders across Surrey and London
Whether you are planning a loft conversion, designing a rear extension or need quick answers on a live build, our structural engineers provide clear calculations and drawings ready for building control.
Architects & designers
Structural input that keeps your drawings moving
- Early structural advice at concept stage
- Calculations and drawings coordinated with your plans
- Quick answers to building control queries
- Reliable turnaround on tight deadlines
Builders & contractors
Fast site support when you need it most
- Temporary works and propping design
- Revised calculations when site conditions change
- Steel and foundation details ready to order
- Engineer site visits to resolve queries
We also work with developers, landlords, churches and commercial clients, from barn conversions to office-to-residential schemes.
Areas we cover
Structural engineers covering Surrey, South-West London and Hertfordshire
With offices in Epsom and Hitchin, our engineers visit sites in every Surrey borough and district, across South-West London and throughout Hertfordshire, usually within days of your go-ahead. Looking for a structural engineer near you in Epsom, Woking, Guildford, Kingston, Richmond, Wimbledon, Sutton, Croydon or Hitchin? We can help.
Surrey boroughs & districts 11
- ElmbridgeEsher, Walton-on-Thames, Weybridge, Cobham
- Epsom and EwellEpsom, Ewell, Stoneleigh
- GuildfordGuildford, Ash, Shalford
- Mole ValleyDorking, Leatherhead, Ashtead
- Reigate and BansteadReigate, Redhill, Banstead, Horley
- RunnymedeEgham, Addlestone, Chertsey
- SpelthorneStaines, Ashford, Sunbury
- Surrey HeathCamberley, Frimley, Bagshot
- TandridgeOxted, Caterham, Lingfield
- WaverleyFarnham, Godalming, Cranleigh, Haslemere
- WokingWoking, Byfleet, Knaphill
South-West London boroughs 6
Hertfordshire & Bedfordshire 5from our Hitchin office
- North HertfordshireHitchin, Letchworth, Baldock
- St AlbansSt Albans, Harpenden
- DacorumBerkhamsted, Hemel Hempstead, Tring
- StevenageStevenage, Knebworth
- Luton & Central BedfordshireLuton, Dunstable, Leighton Buzzard
View all areas we cover →
Not sure if we cover your area? Ask us → We also take on projects across London and the South East.
FAQ
Structural engineer questions, answered
What does a structural engineer do?
A structural engineer works out how a building carries its loads and designs the beams, foundations and supports needed when you alter it. For home projects that means calculations and drawings for building control.
Do I need a structural engineer to remove a wall or chimney breast?
Yes, if the wall or chimney breast carries load. An engineer confirms what it supports and designs the steel beam and supports so the work meets Building Regulations Part A.
Do I need a structural engineer for a loft conversion?
Yes, in practice. A loft conversion changes the loads on floors and walls and usually needs new steel beams, so building control expects engineer-designed calculations and drawings.
How can I tell if a wall is load-bearing?
Clues include walls at right angles to the floor joists, walls directly under another wall and thick internal walls near the centre of the house. An engineer should confirm it on site before anything is removed.
Can my builder or architect do the calculations?
Building control needs calculations from a competent person, normally a structural engineer. Builders often know common beam sizes, but that is not a design for your building.
How long does it take?
We reply within 24 hours on working days and usually visit within 3 to 5 working days. A typical extension or loft design follows about 10 to 12 working days after the visit.
What will I receive?
A site visit, structural calculations and drawings ready for building control, plus answers to building control and builder queries about our design.
What do you need to give me a quote?
The property address, a short description of the work and, if you have them, architect drawings or floor plans. Photos are enough to start.
Which areas do you cover?
From our offices in Epsom and Hitchin we cover all Surrey boroughs and districts, including Epsom and Ewell, Elmbridge, Guildford, Mole Valley, Reigate and Banstead and Woking, plus South-West London boroughs such as Kingston, Richmond, Sutton, Merton, Croydon and Wandsworth, as well as Hertfordshire and Bedfordshire.