A Great Adelaide Hills Builder

Family-owned Adelaide Hills builder, blending traditional craftsmanship and timeless values for quality, lasting solutions.

With over 40 years of experience, David leads the business alongside his son Jack, creating a trusted family team committed to craftsmanship and quality.

Built on a lifetime of quality building experience, we bring together skilled trades, diverse projects, and decades of expertise to deliver exceptional results.

Every photo you see on our site showcases our own work—real projects and real results.

We work closely with you to achieve the outcome you want, providing bespoke building solutions for projects both large and small. From concept to completion, we handle everything, including council applications, design, planning, and construction.

Whether you’re looking to renovate, extend, or create something unique, we’re here to help, and we’re always happy to have a no-obligation chat about your plans.

ABOUT US

Oaktree Building Company was founded to bring together a lifetime of experience in custom home design, quality construction, and building craftsmanship.
With over 40 years of experience, David Barnett, a qualified General Builder and former carpenter, leads the business alongside his son Jack, a qualified carpenter. Together, they specialise in bespoke renovations, restorations, design, project management, and full building services, handling every detail from concept to completion.

Oaktree Building Company is a boutique family-owned builder based in the beautiful Adelaide Hills, where every home reflects the unique lifestyle and stunning environment of the region.

From pre-sale home refreshes and restorations to major renovations and upgrades, no project is too big or small. We work across modern and traditional homes, character cottages, and stately properties - creating results that seamlessly blend with any existing structure.

We specialise in bespoke homes, renovations, and extensions that complement the unique character of the region. Whether you’re dreaming of a new custom build or transforming your existing home, we deliver personalised solutions built to last.

All our projects are proudly designed and built in-house, using quality craftsmanship, sustainable practices, and a love for recycled materials and unique, one-of-a-kind pieces.

At Oaktree Building Company, we respect the scale, materials, and heritage of every home, ensuring each project complements its surroundings and reflects your personal style.

We’re passionate about creating homes that are beautiful, functional, and truly yours.

Let’s have a chat about your ideas - no obligation, just expert advice.

David & Jack Barnett

BUILDING WITH US

Based in the Adelaide Hills, we use traditional craftsmanship, strong values, and quality materials to deliver personalised, bespoke building solutions that enhance and transform your home.

Our services include pre-sale updates, custom home renovations, extensions, and full-scale home improvements - creating beautiful, functional spaces tailored to your lifestyle.

RENOVATIONS AND ALTERATIONS

Whether your project is large or small, we work closely with your existing home, budget, and inspiration to create solutions that truly work for you.

Specialising in Adelaide Hills home renovations, we help update, modernise, and improve functionality to enhance your living space. Our services also include expert pre-sale renovations and preparation to maximise your property’s value.

KITCHENS BATHROOMS ENSUITES

Whether it’s a complete renovation or full replacement, we collaborate with you to deliver bespoke building solutions tailored to your needs. From custom home renovations to full new builds in the Adelaide Hills, every project is designed to seamlessly blend with your existing home and surroundings.

We also manage council applications and approvals when required, ensuring a smooth process from start to finish.

PERGOLAS VERANDAHS CARPORTS DECKING FENCING

We offer a full design and build service for custom outdoor structures and landscaping in the Adelaide Hills. Whether you prefer traditional or contemporary styles, each project is individually designed to complement your home and outdoor environment.

From patios and pergolas to garden features, we create bespoke outdoor living spaces tailored to your lifestyle.

OUTDOOR KITCHENS - Entertaining, Alfresco, Landscaping

Transform an existing area or design a new outdoor space with our expert landscaping, paving, and outdoor lighting services in the Adelaide Hills.

We work with both old and new materials to deliver outstanding, bespoke outdoor projects, whether large or small - tailored to enhance your home and lifestyle.

STUDIOS MANCAVES GRANNY FLATS

Transform your existing shed, garage, or spare room into functional living spaces or studios with our expert design and build services in the Adelaide Hills. We specialise in creating bespoke, budget-friendly additions tailored to your lifestyle and home needs, unlocking endless possibilities for extra space and value.

ACCESSIBILITY & AGING SOLUTIONS

Specialising in tasteful and practical ageing in place solutions in the Adelaide Hills, we help modify your home to meet current and future needs. From adapting existing spaces to relocating bathrooms, we create customised, accessible designs that improve comfort and independence.

Our expert services include installing ramps, widening access doorways, and creating accessible bathrooms - all thoughtfully integrated to enhance your lifestyle while maintaining your home's style.

BARN DOORS and CAFE DOORS

Looking for expertly crafted barn doors, café doors, or fireplace mantles? We design and professionally install custom doors and features using timber, aluminium, and recycled materials.

Proudly serving the Adelaide Hills, we specialise in sustainable building solutions that incorporate reclaimed timber, brick, and steel - bringing character and eco-friendly style to your home.

EXTENSIONS - full design, approval and build service

We specialise in designing, planning, drawing, securing council approvals, and building home extensions in the Adelaide Hills. Our extensions are thoughtfully crafted to complement your existing home, creating beautiful and functional living spaces.

Whether you have your own plans or need a bespoke design, we handle projects of all sizes - from small one-room additions and ensuite bathrooms to full lifestyle extensions complete with landscaping.

CONSERVATORY PROJECTS

We specialise in designing and building stunning English and heritage-style conservatories and pool enclosures across Adelaide and the Adelaide Hills.

Whether complex or simple, each conservatory is crafted to traditional standards and specifications, creating beautiful, timeless additions that enhance your home’s character and value. Our expert craftsmanship ensures every project becomes a striking statement piece and a cherished asset.