From concept to completion – we manage every detail
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Expert Specialist in High-Quality Home Extensions & Renovations
Building futures with green technology
- Who We Are
Eltham Construction is a trusted building company with over 20 years of experience in high-quality construction, renovation, restoration, and new build projects. Based in Wallingford, we work across Oxfordshire, Berkshire, and the surrounding villages.
- Our Approach
We combine traditional skills with a modern, sustainable approach — including solar energy, air source heat pumps, and green oak frame construction.
- Our Services
Our services include:
- New builds & eco homes
- House extensions
- Loft conversions
- Carpentry & joinery
- Electrics
- Landscaping
- Who We Are
About us
Laurence Eltham is the owner and director of Eltham Construction, a company with over 20 years of hands-on experience in construction, restoration, and renovation work across Oxfordshire, Berkshire, and the surrounding villages.
His career began with an apprenticeship in carpentry, where he developed the core skills and craftsmanship that continue to define the company’s work today. After qualifying, Laurence launched his own building firm and has since earned a strong reputation for delivering high-quality new builds, extensions, and full-property refurbishments.
Laurence combines practical trade experience with a deep understanding of how to run a reliable and professional building company. He continues to personally oversee each project to ensure every job — whether a new build, heritage restoration, or modern extension — is completed to the highest standard.
Learn how Laurence Eltham and his team deliver high-quality construction, restoration & renovation across Oxfordshire & Berkshire.
- Who We Are
Our team
We’ve built a loyal team of skilled tradespeople — carpenters, roofers, bricklayers, plasterers, electricians, plumbers, and decorators — most of whom have worked with us for many years.
We value reliability, attention to detail, and good communication, and we bring those qualities to every site we work on.
The skilled team behind Eltham Construction — experienced carpenters, roofers, electricians, and more.

Sustainability
We specialise in creating durable, sustainable structures tailored to meet every client's unique vision.

Architecture Design
Our designs blend creativity and functionality, ensuring spaces that are both aesthetically pleasing and practical.

Building Renovation
Transform existing structures into modern, efficient spaces with our innovative and precise renovation solutions.

Flooring & Roofing
Offering top-notch flooring and roofing services for robust, stylish, and weather-resistant construction solutions.
- Our services
Services overview
We specialise in full-service residential construction, combining traditional building methods with modern efficiency and craftsmanship. Explore each of our core service areas below.
Full-service residential construction: new builds, extensions, loft conversions, carpentry, electrics, landscaping & eco building.
- Our services
House building & extensions
We guide you through house design and planning, including architectural drawings and building regulations. Extending your home can be the ideal solution if you’re looking for more space without the cost or hassle of moving.
Benefits of extending instead of moving:
- No mortgage complications
- No estate agent or solicitor fees
- No stamp duty
- No removal expenses
Popular extension options include:
- Single or double-storey additions
- Garage conversions
- Open-plan living spaces
- Full demolition and rebuilds
We help you stay in the home and area you love while increasing comfort and property value.
- Our services
Loft conversions
A loft conversion is a cost-effective way to increase living space and add value to your home. We manage every element — from assessing structural viability and insulation to design and finish.
Common uses for loft conversions:
- Master bedroom with en suite
- Bright and quiet home office
- Guest suite or children’s playroom
We provide clear guidance on loft height assessments, dormers, Velux windows, stairs, and flooring to make the most of your available space.
- Our services
Carpentry & joinery
With a background in carpentry, Laurence and the team offer comprehensive first- and second-fix services for both structural and decorative works.
Our services include:
- Roof framing, cladding, and stud walls
- Custom staircases and balustrades
- Kitchens, wardrobes, shelving and panelling
- Doors, flooring, skirting and architraves
- Garden rooms, fencing and decking
We work alongside trusted electricians and plumbers to ensure smooth installations for kitchens and internal layouts.
- Our services
Electrics
Our qualified electricians deliver full-scope domestic installations, whether part of a renovation or standalone project.
Electrical services include:
- Full and partial rewires
- Sockets, USB ports and data cabling
- Interior and exterior lighting
- EV charging points
- Underfloor heating
- Security systems and CCTV
All work complies with current UK regulations and safety standards. We also offer outdoor lighting design for decking and garden rooms.
- Our services
Landscaping
To complete your home transformation, we offer tailored landscaping services that enhance both usability and kerb appeal.
We design and install:
- Patios and terraces
- Driveways and paths
- Timber and composite decking
- Fencing, gates and raised beds
- Garden rooms and feature structures
- Our services
Eco building options
We help future-proof your home with sustainable solutions integrated into the design.
Eco features we offer:
- Solar panel installation
- Air source heat pumps
- Green oak timber frame construction
- Sustainable insulation and low-energy systems
- How We Work
Working with us
Discover our process from enquiry to completion, with transparent quotes, JCT contracts & weekly progress updates.
- Our website includes a simple contact us form to make your enquiry easy
- Once received, we’ll get in touch to request any drawings, plans or ideas
- A site visit is arranged to discuss your project — confirmed with a calendar invite
- At the visit, we review your space, talk through expectations, and take photos
- These images support our quantity surveyor in preparing an accurate quote
- You’ll receive your written quote within two weeks
- If needed, we’ll arrange a follow-up meeting to review the quote and discuss timelines, start dates or budgets
- We arrange a second meeting to walk you through the next steps
- A start date is agreed and confirmed
- A JCT home owner’s contract is prepared and sent for your review
- Once approved, the contract is finalised and signed
- A deposit is requested and your slot is secured in our schedule

- We review the preparation checklist with you ahead of the start date
- A finance spreadsheet is created and shared, itemising every stage of the project
- Extras are quoted separately and only added once approved by you
- Weekly invoices are logged on the spreadsheet alongside the progress completed
- Each week, you’ll receive an updated spreadsheet and invoice
- We’re available throughout for questions by phone, email or text

- Testimonials
Here’s What Our Clients Say About Us
We are immensely proud of the feedback and testimonials that our clients provide. We work alongside them from the initial meeting to completion of the project and client feedback is extremely important to us. This provides us with excellent feedback to provide to architects and potential new clients. The feedback also helps us to consider new ideas & suggestions for ways in which we can improve the whole experience for our clients.
Our 1970s house needed a reconfiguration of the downstairs layout and an extension to provide us with the space we needed as a family of 5. The work has included knocking through our old kitchen and dining room to create a large and airy family kitchen living space, the refurbishment and updating of our bathrooms and the addition of a new living room with wood burning stove. Alongside the internal work Thames Construction have overseen the fitting of new windows and doors throughout, the rendering of the property and the replacement of the roof as well as hard landscaping to the front and rear of the property. We are very pleased with the results of the work done which is already making a difference to daily family life. The quality of the finish is a high standard and Laurence ensures that what is delivered by the team of trades meets our needs and expectations. Laurence has been involved with the build from the discussions with our architect and throughout. The trades people that work with Laurence have all been capable and very polite which has made it easier to live in the house during the renovation, as we decided to do.
Tamsin & Neil Davis Cholsey, Wallingford, Oxon. 3rd January 2022We are very pleased with the results of our extension built by Thames Construction. We valued the good communication with Laurence and he was always prompt at sorting out any issues and easy to get hold of. The quality of the trades used was excellent and they were all polite and helpful. We wouldn’t hesitate working with Thames Construction again in the future.
Chris & Bryony Smith GoringThames Construction undertook a significant remodelling of our house in 2023. I would highly highly recommend them as a building company. Firstly, we found their work to be first class and they themselves to be extremely friendly and efficient to deal with on site and at the office. In terms of the budget, they delivered exactly what they said they would when they would at the price they said it would be – any overages were only ever due to us increasing our ambitions or unforeseen circumstances beyond the anyone’s control. When we did inevitably encounter unexpected challenges the implications of those challenges in both time and money were clearly communicated immediately. At the end of the job – when all the annoying little things are inevitably hanging over, they absolutely stayed with us and made sure the job got done without any sense that we were imposing with our detailed small requests. Finally – perhaps the most important thing – the results are amazing and we could not be happier with our fundamentally new living space. If anybody would like to speak to us in person about this. We would be happy to do so.
Jesse and Sophia Cleverly Goring on Thames, January 2024The Thames Construction team were a dream from start to finish. Friendly, professional and with great craftsmanship. Exactly what you want when you have a team in for several weeks. The extension work that was carried out was brilliant and we’re so happy with the result. We don’t have a single gripe about any of the specialist tradesmen that came through - masons, plasterers, decorators, carpenters, plumbers, electricians, roofers, the foreman, and the business manager, Mandy. All brilliant.
Lance & Laura Abingdon. 23rd May 2023Just wanted to take this opportunity to thank yourself, Laurence, and the team for everything they have done. Please extend our thanks to everyone involved, we are really pleased with the result seeing it come to fruition is very satisfying. Everyone has been extremely polite (despite some provocation), friendly and accommodating. You have been a great team to work with and we would not hesitate in recommending Thames Construction for future work
The Cripps family- FAQS
Your Questions, Answered
Answers to your questions on insurance, certifications, living onsite, sustainable builds & quote timelines.
Yes - we carry full public liability insurance (2 million) and works insurance (10 million).
Yes – all our electricians are NICEIC registered and our gas engineers are Gas Safe certified.
Usually yes. We’ll plan with you to minimise disruption wherever possible.
Absolutely – we can install solar panels, air source heat pumps, sustainable insulation, and more.
We aim to provide a detailed quote within two weeks of reviewing your plans or visiting your site.
Contact form
- Contact us
We’d Love to Hear From You
Get in touch for quotes on new builds, renovations, extensions & eco homes in Oxfordshire & Berkshire.
Eltham Construction
8 Westfield Road
Benson
Wallingford
OX10 6NH
Office: 07399 775301
Onsite: 07877 598431
Email: info@elthamdevelopments.co.uk