Parquet Flooring Calculator

Q: How many parquet blocks do I need per square metre?

Divide 1 m2 by the area of one block (length x width in metres). A standard UK parquet block of 230 x 70 mm covers 0.0161 m2, requiring approximately 62 blocks per m2. For a 20 m2 room you need 20 x 62 = 1,240 blocks before waste. Add 10% waste for a standard basket-weave or brick pattern, or 15% for herringbone where more angled cuts are required at room edges.

Q: What is the difference between solid parquet blocks and engineered parquet panels?

Solid parquet blocks are made from a single piece of hardwood (typically 19-22 mm thick) and are glued directly to a concrete or screed subfloor using bitumen adhesive or flexible floor adhesive. They can be sanded and refinished multiple times over their lifespan of 50-100 years. Engineered parquet panels have a thin hardwood veneer (2-6 mm) bonded to a plywood or HDF core. They are more stable in varying humidity conditions, can be laid floating or glued, and suit installation over underfloor heating better than solid blocks.

Q: What laying patterns can I use for parquet flooring?

The most common parquet patterns in the UK are: herringbone (blocks laid in a V-shape at 45 or 90 degrees to the room), basket weave (blocks laid in alternating perpendicular groups), brick bond (blocks laid in staggered rows like brickwork), and double herringbone (two blocks wide per chevron). Herringbone is the most popular pattern and suits both traditional and contemporary interiors. It requires the most cutting and therefore the highest waste allowance (15-20%). Brick bond is the simplest pattern and suits narrower or longer blocks.

Q: What subfloor do I need for parquet flooring?

Solid parquet blocks must be glued to a smooth, solid, dry subfloor - concrete or sand-cement screed is ideal. The subfloor must be flat to within 3 mm over a 2 m straightedge and have a moisture content below 75% relative humidity (approximately 3% moisture content by weight for screed) before laying. Timber joisted floors require a minimum 18-22 mm plywood overlay firmly fixed to the joists. Engineered parquet can be floated on most sound subfloors including timber. Never lay parquet directly over chipboard without a plywood overlay.

Q: How long does parquet flooring need to acclimatise?

Solid parquet blocks should acclimatise in the room where they will be laid for a minimum of 7-14 days before installation, ideally in open stacks to allow air circulation. The room should be at normal living temperature (18-20 degrees C) and humidity (45-65% RH) during acclimatisation. Engineered parquet typically requires 48-72 hours acclimatisation. Failing to acclimatise can result in boards gapping in dry conditions or lifting if laid too dry.

Q: What waste allowance should I use for parquet flooring?

Allow 10% waste for a simple rectangular room with a brick bond or basket weave pattern. For herringbone patterns, use 15% as the angled cuts at the room perimeter waste significantly more material. For complex room shapes with many alcoves, chimney breasts or fitted furniture, use 15-20%. Solid parquet blocks are available in batches that can vary in colour - buy all blocks from the same batch and keep a small surplus for future repairs.

How many parquet blocks or panels do I need?

Divide the room area by the area of one block or panel to get the quantity, then add waste. A traditional UK parquet block is typically 230 x 70 mm, covering 0.0161 m² per block - a 20 m² room needs approximately 1,242 blocks before waste. For herringbone layouts, increase your waste allowance to 15-20% due to the angled cuts at room edges. Solid parquet blocks are glued directly to a screeded or concrete subfloor; panels and engineered parquet can be floated or glued. Allow a 48-72 hour acclimatisation period before laying to stabilise moisture content.

Choose your pattern and block size to calculate exactly how many blocks you need, with waste and adhesive

Metric (m) Imperial (ft / in)

Rooms

Lay Pattern

Herringbone - allow 15% waste for cuts at the angled ends of each row

Block Size

Block Width (mm)

Block Length (mm) Block face area: 0.0196 m² — ~51 blocks per m²

Waste Factor (%)

15%

15% recommended for herringbone - adjust based on room shape

Adhesive

Coverage per tub (m²) Check product label - typically 4-8 m² per tub

Job Costing

Enter costs in your local currency.

Cost per block

Cost per adhesive tub

UK Market Prices Fills in the material cost fields with current UK market prices. You can review and edit each price before applying.

Results

Total Floor Area
-
m²

Blocks to Order

inc. waste

Area with Waste

m² to cover

Adhesive Tubs

tubs needed

Room Breakdown

Room	Area	Area + Waste	Blocks

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Frequently Asked Questions

How many parquet blocks do I need per square metre?

Divide 1 m² by one block's area. A standard 230 x 70 mm block covers 0.0161 m² = approximately 62 blocks per m². A 20 m² room needs 1,240 blocks before waste. Add 10% waste for brick bond/basket weave; 15% for herringbone.

What is the difference between solid parquet blocks and engineered parquet panels?

Solid blocks (19-22 mm): single piece hardwood, glued to screed or concrete, sanded and refinished many times, lifespan 50-100 years. Engineered panels: thin hardwood veneer on plywood/HDF core, more stable in varying humidity, can be floated or glued, better suited to underfloor heating.

What laying patterns can I use for parquet flooring?

Common patterns: herringbone (V-shape at 45° or 90° - most popular, highest waste), basket weave (alternating perpendicular groups), brick bond (staggered rows - simplest, least waste), double herringbone (two blocks wide per chevron). Herringbone suits both traditional and contemporary interiors but needs 15-20% waste allowance.

What subfloor do I need for parquet flooring?

Solid blocks: concrete or screed, flat to within 3 mm over 2 m, moisture content below 75% RH before laying. Timber floors need minimum 18-22 mm plywood overlay. Engineered parquet can be floated on most sound subfloors. Never lay parquet directly onto chipboard without a plywood overlay.

How long does parquet flooring need to acclimatise?

Solid blocks: minimum 7-14 days in the room in open stacks at normal living temperature (18-20°C) and humidity (45-65% RH). Engineered parquet: 48-72 hours. Insufficient acclimatisation causes boards to gap in dry conditions or lift if laid too dry.

What waste allowance should I use for parquet flooring?

Simple room, brick bond or basket weave: 10%. Herringbone patterns: 15%. Complex rooms with alcoves and chimney breasts: 15-20%. Solid blocks vary in colour between batches - buy all from the same batch and keep a small surplus for future repairs.

UK Building Regulations Part E • Part M • BS 8201

Select a type above--

Select a scenario above to see the minimum requirements from Part E, Part M and BS 8201.

Lay Patterns

Herringbone - Blocks laid at 90° to each other in a V-shape. The most popular parquet pattern. Allow 15% waste for the angled cuts at borders.
Chevron - Blocks cut at 45° so the ends meet in a perfect point. More precise than herringbone - allow 18-20% waste.
Basket Weave - Groups of parallel blocks alternate direction. Works best with square blocks or blocks in a 2:1 ratio. Allow 12% waste.
Straight / Brick Bond - Boards run parallel in staggered rows, like brickwork. Simple to lay - 10% waste is sufficient.
Versailles - A formal French pattern of interlocking squares. Typically comes as pre-made panels. Allow 12% waste.

Block Sizes

70 x 280mm - Classic herringbone block (1:4 ratio). Most widely available.
90 x 360mm - Larger herringbone for bigger rooms and grander spaces.
50 x 250mm - Slim strip, often used in period restorations.
70 x 350mm / 90 x 450mm - Common chevron block sizes (5:1 ratio).

Always order from the same batch - wood colour and grain can vary significantly between batches.

Installation Tips

Acclimatise blocks for 48-72 hours in the room before laying
Subfloor must be flat to within 3mm over 1.8m
Use a flexible wood adhesive - never tile adhesive or PVA
Sand and finish after laying (if unfinished blocks) - usually 2-3 coats of oil or lacquer
Leave an expansion gap of 10-15mm around all walls
Start from the centre of the room for herringbone and chevron patterns

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Parquet Flooring Calculator

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