Installing flooring in an irregular room — one with bay windows, alcoves, angled walls, or non-square corners — is definitely achievable as a DIY project, but it takes careful planning, accurate measuring, and patience. Getting the layout right before you cut a single board or tile will save you time, money, and wasted material.
Start with an Accurate Floor Plan
Before you buy materials or pick up a saw, draw a detailed floor plan of the room to scale. Measure every wall, recess, and protrusion. Don't assume any corner is a true 90°. Use a speed square or combination square to check each corner, and note the actual angle if it differs.
- Measure the room at multiple points (walls often bow or taper)
- Mark the positions of door frames, hearths, built-in furniture, and any floor penetrations
- Calculate your total floor area, then add 10–15% for waste — more if the room has lots of angles or you're laying on a diagonal
For complex rooms, graph paper or a free floor-plan app can help you visualise the layout before committing.
Choose the Right Starting Point
In a regular room you'd typically start from the centre. In an irregular room, identify the most prominent or visible wall — usually the one you see first when entering — and work outward from there. This ensures the most noticeable area looks balanced, even if cuts at less-visible edges are awkward.
- Snap a chalk line parallel to your feature wall as your reference line
- Dry-lay a row of boards or tiles along this line to check how cuts will fall at the edges
- Adjust the starting line if you'd end up with very thin slivers at a visible wall
Dealing with Angled Walls and Odd Corners
Angled walls (common in rooms under a staircase, in older villas, or in rooms with bay windows) require angled cuts on your flooring boards or tiles.
Measuring and Marking Angles
Use a sliding bevel gauge (also called an angle finder) to capture the exact angle of the wall, then transfer it directly to your material. For compound angles — where a wall is both angled and not perfectly plumb — take your time and use a scribe or contour gauge to trace the exact profile.
Cutting Tools
- Mitre saw / drop saw — ideal for angled end cuts on timber or laminate boards
- Jigsaw — best for curved cuts, notching around door frames, and irregular shapes
- Angle grinder with a diamond blade — for cutting ceramic or porcelain tiles at angles (always wear eye protection and a dust mask)
- Tile wet saw — gives cleaner, more accurate tile cuts and is worth hiring for larger jobs
Always cut away from yourself, wear appropriate PPE (safety glasses, hearing protection, dust mask), and follow WorkSafe NZ guidelines when using power tools.
Alcoves and Recesses
Alcoves are one of the trickiest features. The key is to treat each section separately — run your main field of flooring first, then fit the alcove as a continuation, keeping the board or tile pattern aligned.
- Use a scribe block to copy the exact profile of an uneven wall onto your board before cutting
- For timber or laminate, leave the standard 10 mm expansion gap around all fixed edges (walls, cabinetry, hearths) as required by most manufacturers
- For tiles in wet areas, follow the requirements of MBIE Building Performance and the NZ Building Code clause E3 (Internal Moisture) for waterproofing and grout selection
Curved Walls
Curved walls — found in some Art Deco homes or purpose-built rooms — require either flexible flooring (sheet vinyl, luxury vinyl plank bent carefully) or a series of small, straight cuts that approximate the curve. For tiles, a wet saw and patience are your best friends. For timber or laminate, a jigsaw with a fine blade lets you follow a traced curve.
Always template the curve first using cardboard or thin hardboard before cutting your actual flooring material.
Subfloor Preparation
No matter how complex the room shape, a flat, dry, and structurally sound subfloor is essential. Check for squeaks, soft spots, or high points. In NZ's variable climate, moisture in the subfloor is a common cause of flooring failure — particularly relevant in older homes or those on piles. BRANZ has good guidance on subfloor moisture management.
Buying Materials in NZ
Flooring materials for irregular rooms are widely available at Bunnings, Mitre 10, and PlaceMakers. Always buy from the same batch (same dye lot for tiles, same production run for timber) to avoid colour variation. As a rough guide, expect to pay more per square metre for installation in irregular rooms due to the extra labour and waste involved.
When to Call a Professional
If the room has multiple angles, curves, or complex features like hearths and built-in joinery, it's worth getting a qualified flooring installer involved — at least for the tricky sections. A professional will have the right tools, experience with pattern matching, and can often source materials at trade prices.
For wet areas (bathrooms, laundries), tiling work must comply with the NZ Building Code (clause E3), and waterproofing membranes must be correctly installed — if you're unsure, a licensed tradesperson is the safest option. Plumbing-related work must be carried out by a PGDB-licensed tradesperson, and any electrical work near the floor (underfloor heating, for example) must be done by a registered electrician under the EWRB.
You can find experienced local flooring installers on tradedirectory.co.nz.
