40+ GOOGLE REVIEWS

Home Renovations & Additions in Penrith

With over 20+ years’ experience in Sydney’s north-west, we transform homes to complement our client’s lifestyles and budgets.

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More room for a growing family, without leaving the home you love. Keystone Building are Penrith locals and have been designing and building second storey additions, ground floor additions and major home renovations since 1997. Extend up, extend out or reconfigure what you already have to create more space, all with one local, family-run builder who sees the project through from first sketch to final handover.

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Building in Western Sydney for more than 25 years, with a 5.0-star rating across 40-plus Google reviews, fixed-price contracts and full licensing and insurance on every job.

Who We Are

Keystone Building is based in Penrith, so we know the ground your home sits on. We understand the generous established blocks around Glenmore Park and Cranebrook, the reactive clay soils that shape how footings are engineered, the summer heat that a top floor has to be designed for, and the way Penrith City Council assesses a residential addition.

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That local knowledge is the difference between a design that sails through approval and one that stalls. It is why Penrith homeowners trust us with renovations they will actually live in for decades, designed around their lifestyle and how a growing Penrith family really uses the space.

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Preserve Outdoor Space

Build vertically to maintain your backyard, garden, or pool area— ideal for smaller blocks.

Add Views and Light

Second levels can open up elevated outlooks and bring in more sunlight, enhancing both value and lifestyle.

Get More Privacy

Create spacious master suites or quiet study areas completely separated from the main living zone.

Boost Property Value

Second storey additions are a strong investment, often delivering a higher return by substantially increasing usable floor area.

Why Us?

We give Penrith families room to grow without the upheaval of moving. Whether you build up with a second storey addition, keeping your yard, pool and garden untouched, or extend out at ground level for easy single-level living with step-free access and better indoor-outdoor flow, we help you gain the bedrooms, bathrooms and living areas you need. Each one adds everyday space and can lift the value of your property at the same time.

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We also reimagine the home you already have. Through major home renovations, we reconfigure your floor plan to unlock better flow, more natural light and modern kitchen and bathroom spaces, all finished to a high standard of quality that creates lasting value from your existing property.

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Most of all, we handle everything under one roof. From concept design, engineering and structural drawings to certifications and Penrith City Council approvals, our in-house team manages the entire process, so you are never left chasing separate consultants. One team, start to finish.

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How We Can Help

Most Penrith homes sit on generous blocks, and that land is usually why people bought here. Wherever it makes sense, we build up rather than out, adding the living space you need while leaving the yard, pool and side access exactly as they are.

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Much of Western Sydney sits on reactive clay that swells and shrinks with the seasons. It is a normal local condition, not a barrier, but it does mean we engineer footings and any reinforcement specifically for your site rather than assume them.

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Penrith records some of the hottest days in the Sydney basin, and an upper level feels every degree. We design for orientation, shading, cross-ventilation and insulation so new rooms stay comfortable and comfortably meet BASIX requirements.

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Every extension needs the right approval, whether a Complying Development Certificate (CDC) or a Development Application (DA) with Penrith City Council. We identify the pathway from the start and prepare your plans to meet the relevant controls, keeping the process efficient and your project moving.

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Our Refined Process

Free introductory session: a relaxed phone call to get to know you, your ideas, your budget and your goals.
Free design consultation: a site visit where we sit down and talk through every concept of your proposed build.
Concept design and proposal: a concept plan from a qualified Building Designer, paired with a fixed-price proposal.
Plans and approvals: architectural and structural drawings prepared and lodged with the relevant authority.
Preparing to build: we walk you through the pre-construction checklist so you are ready for day one.
Construction: the real work begins, and your vision becomes a finished, lived-in home.

Facts About Us

Keystone is a family-run business that has been extending, adding to and renovating homes around Penrith since 1997, nearly three decades of local experience. Every project is guided by quality workmanship and a genuine focus on how your family actually lives.

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We keep builds on time and on budget, backed by a detailed fixed-price contract that sets out the full scope and cost upfront, so there are no hidden surprises. Our staged construction methods mean most families stay in the home throughout the build, saving on rent and storage, and we work hard to keep disruption to a minimum by containing dust, managing noise, tidying daily and protecting your finishes.

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Above all, we put you first. Every layout starts with your family's lifestyle, and you stay involved in each key decision along the way.

Areas We Serve in the Penrith LGA

We build throughout the entire Penrith LGA and surrounding suburbs, so wherever you are in the local area there is a good chance we are already working nearby. Penrith, South Penrith, Glenmore Park, Cranebrook, Kingswood, Jamisontown, Emu Plains, St Marys, Orchard Hills, Werrington, Cambridge Park, Leonay, Regentville and Llandilo.

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Our service also reaches into the Hills District, South-West Sydney and the nearby Blue Mountains and Hawkesbury areas.

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About Us