Matching a Timber Floor in a Camberwell Extension

Matching the old boards in the front of a Camberwell house to a new extension is possible, but an exact match is rare. Old boards are often narrower than modern ones, they have aged and been sanded for decades, and their colour has shifted in a way new timber can’t copy on day one. You have three realistic options: extend the old floor with matching timber and sand the lot together, run one new engineered floor through the whole house, or stop the old floor at a clean break and lay something deliberately different behind it. Whichever you choose, plan for the height difference between the old timber floor and the new slab first.

The typical Camberwell renovation

Many houses in Camberwell follow the same renovation pattern. The front of the house, often Edwardian, a Californian bungalow or interwar, keeps its hallway and front rooms. The back is replaced with a new kitchen, living and dining area that opens onto the garden. The original rooms sit on stumps with timber floors on joists. The extension sits on a concrete slab.

So you end up with two different structures, built decades apart, meeting at a doorway or an opening somewhere near the middle of the house. How the floor handles that join is what this guide is about. Our Camberwell timber flooring page has more on the suburb’s houses generally.

Why a perfect match is so hard

People are often surprised that the same species, newly milled, doesn’t look like their old floor. There are a few reasons:

• Width. Old boards in houses of this age are often narrower than the boards sold today. A different width shows at a glance, even if the colour is close.
• Age and light. Timber changes colour with light and time. Boards that have been in a front room for a century have a depth of colour a new board won’t have for years.
• Sanding history. Each sand removes some timber and some of the old colour. Some floors have been sanded several times and coated in different finishes along the way.
• Species. Unless you know exactly what the old floor is, it is hard to be certain. A loose board from under the house, or a clear daylight photo, helps narrow it down.
• Thickness and profile. Old tongue and groove boards may not be the same thickness or have the same joint as new stock, which affects how they meet.

Recycled boards of a similar species and width get closest, if they can be found in the quantity you need. Sourcing recycled or old boards to match isn’t a service we currently offer.

The three options side by side

Approach	What is involved	How it looks	Suits
Extend the old floor	Lay matching or recycled boards in the extension, then sand old and new together and coat in one finish	Closest to original, with a tone difference that softens over time	Owners who want to keep the original floor and live with some variation
One new floor through	New engineered boards fixed over the sound old floor at the front and glued to the slab at the back	One continuous floor, same colour and width everywhere	Open-plan renovations where the old and new parts run into each other
Clean break	Keep and restore the old floor at the front; lay a different board in the extension, stopping at a door or step	Two floors that look deliberate rather than mismatched	Houses with a clear division between old rooms and new living area

The clean break often gives the best-looking result when the house has a natural division, such as a doorway at the end of the hall. When the old and new spaces open straight into each other, one new floor through is usually the tidier answer. A patched match in the middle of an open room is the hardest to get right.

If you choose one new floor, engineered oak is the usual pick, because the same board works over the old timber floor and on the slab. For an Australian hardwood look, the hardwood range is 14 mm engineered Blackbutt, Spotted Gum and Victorian Ash. If full-thickness solid boards matter to you for a close match, we also supply 18 mm solid tongue-and-groove boards.

Dealing with the height difference

This is the practical problem under all three options. The old timber floor and the new slab rarely finish at the same height. Sometimes the difference is a few millimetres, sometimes it is a step.

Before the slab is poured

If the extension isn’t built yet, this is the cheapest time to solve it. Tell your builder which floor is going in and how thick it will be, including adhesive or underlay. The slab can then be set so the finished floor in the extension meets the finished floor at the front. A conversation now saves levelling or a trim later.

After the slab is in

If the slab is lower than the old floor, levelling compound can build it up and ramp it gradually towards the join. If it is higher, the options are fewer: grinding a little off the slab, packing the old floor, or accepting a small step with a trim. When the difference is too large to hide, a proper step with a nosing is often neater than a long ramp you can feel underfoot.

Laying a new floor over both

A new board over the old floor raises it by the board’s thickness. The same board glued to the slab raises that side by roughly the same amount. So the difference you started with mostly stays, and it has to be dealt with in the preparation, not by the new floor. The subfloor preparation page explains grinding and levelling in more detail.

Thresholds and transitions

Where two floors meet, you need a transition. The options, from least to most visible:

1. Flush butt join. Two floors at the same height meeting in a tight line, usually under the centre of a door. Needs levels to match closely.
2. Flat trim. A thin strip that covers the joint between two floors at the same height.
3. Reducer. A sloped trim that takes a small difference in height from one floor down to the other.
4. Step nosing. A finished edge on a genuine step, used where the difference is too big for a ramp.

Pick the trim colour to suit the floor it sits against, and put the join where a door closes over it if there is one. A threshold in the middle of an open room always reads as a join.

Board direction through the join

In the old part of the house, boards run across the joists, and a new floor laid over them is often run across the old boards. In the extension on a slab, there is no such limit. That can leave you with boards pointing one way at the front and the natural direction for the new living area pointing another. If the two spaces are separate rooms, a change of direction at a doorway is fine. If they open into each other, pick one direction for both and plan the preparation to suit. This is one of the things we settle at the measure.

Coordinating with your builder

A few points are worth agreeing on early. New slabs hold a lot of moisture and need to be tested before timber goes down, which can take longer than the building schedule assumes. Timber floors usually go in once wet trades are done and the house is closed in. Decide whether the kitchen goes in before or after the floor, and who is responsible for the join between old and new. If you are working with an older house as a whole, our guide to timber floors in period homes covers restoring original boards.

Next step: measure both halves together

Bring a loose board or a daylight photo of the old floor to the showroom, along with your extension plans. Then book a free measure and quote, ideally before the slab is poured. We measure the height at the join, check the old floor and the slab, and price each option so you can compare. You’re welcome to call us on 1300 690 160 or visit 2/1386 Toorak Road, Camberwell.