House extensions
Single-storey, double-storey, rear, side, front and wraparound extensions, engineered as one project.
Learn moreEverstone is led by Dr Omid Khalaj, a Chartered Civil Engineer (CEng MICE) and Registered Ground Engineering Professional. Omid explains your project, the challenges and the possible solutions in plain English, then manages everything from design to handover.
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Everstone Build & Development Ltd is a Chartered Civil Engineer-led building company serving South Manchester and Cheshire. We design and build house extensions, loft and garage conversions, renovations and structural works, and we manage the complete project from the earliest design stages to final handover. Every project is led personally by Dr Omid Khalaj, CEng MICE, RoGEP.

From the first design ideas to the final finishes, Everstone manages your project with the structural engineering handled in-house.
Single-storey, double-storey, rear, side, front and wraparound extensions, engineered as one project.
Learn moreDormer, hip-to-gable and mansard conversions, with the structure assessed first.
Learn moreTurn the space you already have into an office, bedroom or playroom.
Learn moreComplete bathroom refurbishments, from layout and plumbing to tiling and finishes.
Learn moreReconfigured layouts and whole-home refurbishments, managed by one team from strip-out to final clean.
Learn moreKnock-throughs, steel beams, foundations and ground works designed by a Chartered Civil Engineer.
Learn moreA selection of our extension, conversion and refurbishment projects.






Engineering expertise from day one. Your project is led by a Chartered Civil Engineer from the first conversation to final handover.
Omid is a Chartered Civil Engineer (CEng MICE) and Registered Ground Engineering Professional (RoGEP). Structure, foundations and ground conditions are considered from the outset, at the very first visit.
You get an honest, practical view of what is possible, the challenges your project may face and the solutions available, before you commit to drawings.
Omid explains your project, the options and the costs in plain English, and confirms the details in writing so you can make decisions with confidence.
We coordinate the design, building work, trades, installations and finishes, so you have one contractor and one point of contact throughout, without finding and managing separate contractors.
Your quotation sets out the included work and price. The price remains fixed for the agreed scope, with any changes to the work and costs discussed and agreed before proceeding.
A realistic written programme, regular updates and personal involvement from the director, so you always know what is happening and what comes next.
Speak to Omid, get an honest view
Tell us about your project, then talk it through with Omid. We tell you what is possible and give you a realistic budget range.
Survey, design, itemised quote
We visit, measure up and coordinate the design and structure, then give you a clear, itemised quotation.
Managed build, walk-through, sign-off
We build to an agreed programme with staged payments, keep you updated throughout and hand over with a walk-through and sign-off.

BEng (Hons), MSc, PhD, CEng, MICE, RoGEP
A Chartered Civil Engineer (CEng MICE) and Registered Ground Engineering Professional (RoGEP), personally involved in every project.
Omid founded Everstone Build & Development after more than two decades in construction, civil engineering, research and consultancy. He holds a BEng (Hons), MSc and PhD in Civil Engineering and a PhD in Mechanical Engineering.
That background means practical technical advice and thoughtful solutions. When Omid looks at your home he sees the loads, the foundations and the ground as well as the finish, so he can tell you early what will work, what will not, and why.
You deal with Omid directly. He visits, explains your project, its challenges and the possible solutions, and stays involved from the first conversation to handover.
"I want every client to know exactly what they are getting, why it will stand up, and what it will cost. That is what an engineer brings to building."
Omid Khalaj, Founder and Director
Read Omid's full biographyEvery element crafted with care.
Built to last with quality supplies.
A dedicated team for every aspect of your project.
We primarily serve South Manchester and Cheshire, and welcome enquiries for suitable projects further afield.
Many single-storey rear extensions fall under permitted development, while double-storey extensions, wraparound extensions and some loft conversions often need planning permission or a lawful development certificate. Everstone tells you where your project sits during the free feasibility check.
As a guide, single-storey extensions in South Manchester and Cheshire typically start from around £2,000 to £2,800 per square metre plus VAT for the build, before kitchens and finishes, and loft conversions typically cost around £25,000 to £35,000 plus VAT for a rooflight conversion and £40,000 to £60,000 plus VAT for a dormer. Everstone gives a realistic range before any drawings are done.
Yes. Everstone can work with your architect or arrange the drawings, and structural calculations are handled by the company's director, Dr Omid Khalaj, a Chartered Civil Engineer (CEng MICE).
A typical single-storey extension takes around 10 to 16 weeks on site and a loft conversion takes around 6 to 12 weeks. Everstone agrees a written programme with you before work starts.
Yes. Everstone Build & Development Ltd is fully insured, with public liability and employer's liability insurance, and the company is led by a director with over 20 years of experience in construction and civil engineering.
Yes. The feasibility check is a call with Omid and, where the project is a good fit, a site visit and itemised quotation, with no charge and no obligation.

Talk your project through with a Chartered Civil Engineer, and get an honest view of what is possible and a realistic budget range, before you spend money on drawings.
Hi there. Planning an extension, conversion or renovation? Send us a message on WhatsApp and Omid or his team will get back to you.
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