Add in Sehmi Site settingsBuilt properly.Finished beautifully.
Extensions, loft conversions and full refurbishments across London, delivered by one team from first visit to handover.
- [Fully insured][Public liability cover]
- Free site surveyNo obligation
- Written quotesItemised and fixed
- [Accreditation][e.g. TrustMark member]
London homes, built with care
We’re a London building company run by people who still work on the tools. We price honestly, keep you updated and finish every job as if it were our own home.
Skilled trades
Our own trusted team on every job.
On schedule
A clear timeline, agreed up front.
Honest pricing
Itemised quotes you can hold us to.
Peace of mind
[Insured work with a written guarantee.]
Our services
Whether you’re adding space or transforming what you have, we manage the whole job: trades, materials and schedule.
House extensions
Rear, side-return and wrap-around extensions that bring in light and space.
Explore house extensionsLoft conversions
Dormer, hip-to-gable and mansard lofts, from structure to final finish.
Explore loft conversionsFull refurbishments
Whole-house renovations: rewiring, replastering, heating and new layouts.
Explore full refurbishmentsKitchens
Kitchen fitting and open-plan knock-throughs, steel beams included.
Explore kitchensBathrooms
Bathrooms, en-suites and wet rooms, fully tiled and finished.
Explore bathroomsNew builds
New homes and outbuildings, managed from groundwork to handover.
Explore new buildsSwipe to see all services
The Sehmi Standard
Ten commitments we make on every project, whatever the size. Hold us to them.
- 01
Free survey, written quote
Every job starts with a site visit and an itemised quote in writing.
- 02
One named project lead
The same person runs your job from start to finish, and answers your calls.
- 03
Timeline agreed up front
Start date and key stages set out before any work begins.
- 04
Your home protected
Floors, stairs and furniture covered before we lift a tool.
- 05
Cleared every day
Rubbish removed and the site left safe and tidy each evening.
- 06
Weekly photo updates
Progress photos and a quick summary, so you’re never guessing.
- 07
Neighbours kept informed
We let them know before noisy or disruptive work.
- 08
No surprise extras
Any change is priced and agreed with you before we do it.
- 09
Snagging walk-round
We check every detail together before we call the job done.
- 10
[X]-year guarantee
[Your workmanship guarantee, in one line.]
Four simple steps
- 1
Free site survey
We visit, measure up and listen to what you want from the space.
- 2
Design & quote
Drawings, approvals help and an itemised written quote.
- 3
The build
One project lead, a tidy site and regular progress updates.
- 4
Handover
A final walk-round together, sign-off and aftercare.
Add in Sehmi Site settingsAdd in Sehmi Site settingsRear kitchen extension, [Borough]
[Two sentences on the transformation: what the space was like before and how the family uses it now.]
- Build time
- [X] weeks
- Added space
- [X] m²
- Project type
- Extensions
- Location
- [Borough]
Approvals, handled
London projects often need permissions before work starts. We’ll explain what you need and help you get it sorted.
Planning permission
Help with drawings and applications to your local council.
Building regulations
Inspections and sign-off so your work is certified.
Party wall agreements
Guidance on notices when you share a wall with neighbours.
Structural calculations
Engineer’s calcs for steel beams and structural changes.
Trusted by London homeowners
We are absolutely delighted with our new house extension! Harpreet and his team at Sehmi Construction were professional, reliable and incredibly hardworking. They kept us updated throughout the project, and the quality of the finished work is fantastic. We couldn't recommend them enough!
Brilliant experience from start to finish. Sehmi Construction transformed our unused loft into a beautiful bedroom with an en-suite. The team was punctual, tidy and paid great attention to detail. Everything was completed to a high standard. Would definitely use them agai
We recently had our entire house refurbished, and the results are amazing. Harpreet Singh was approachable, knowledgeable and always happy to answer our questions. His team worked hard to make sure everything was finished beautifully. Really pleased with the whole experience!
Couldn't be happier with our new kitchen! The team at Sehmi Construction did an outstanding job, from the initial planning to the final finishing touches. The workmanship was excellent, and they treated our home with care and respect. Highly recommended!
Really impressed with the quality of work and attention to detail. Our bathroom looks completely transformed! The team was friendly, professional and kept everything clean and organised. It's refreshing to find builders who genuinely care about the finished result. Excellent service!
Working across London
We’re based in [AREA] and work across these boroughs. Not on the list? Get in touch, we may still be able to help.
Check your area- [Borough]
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Questions, answered
Can’t see your question? Give us a call and we’ll talk it through.
Ask us a questionAre your site surveys and quotes free?
Yes! At Sehmi Construction, we offer free, no-obligation site surveys and quotations. Our team will discuss your requirements, assess the property, take the necessary measurements and provide a clear, itemised quotation. This helps you understand the scope and estimated cost of your project before making any commitment.
Which areas of London do you cover?
Sehmi Construction undertakes residential building and renovation projects across London and surrounding areas, subject to project location and availability. Whether you're planning a house extension, loft conversion, kitchen renovation or complete property refurbishment, get in touch with your postcode and project details to check if we cover your area.
Can you help with planning permission and building regulations?
We can help you understand the planning and building regulation requirements relevant to your project. Some extensions and loft conversions may fall under permitted development rights, while others require planning permission. Where specialist input is needed, we can discuss working alongside architects, structural engineers and building control professionals to help your project progress smoothly.
Will I have one point of contact?
We believe good communication is essential to a successful building project. Our aim is to provide you with a dedicated point of contact who can answer your questions, discuss progress and keep you informed throughout the construction process. Harpreet Singh, founder of Sehmi Construction, is committed to a professional and customer-focused approach.
Do you offer a guarantee on your work?
At Sehmi Construction, we take pride in delivering quality workmanship and carefully finished projects. We aim to complete every job to an excellent standard, using suitable materials and experienced tradespeople. Any applicable workmanship guarantees or manufacturer warranties will be explained and confirmed before work begins.
How soon can you start?
Our availability depends on the size and complexity of your project, our current schedule and whether planning approvals or other preparations are required. Smaller renovations may be arranged sooner, while larger extensions and new builds generally require additional planning. Contact Sehmi Construction to discuss your requirements, and we'll provide an estimated start date and project timeline.
Ready to start your project?
Book a free site survey. We’ll visit, talk through your plans and send a clear written quote, with no pressure to go ahead.