Unfinished Engineered Oak Flooring

Raw engineered oak, sanded and finished after it is laid. The choice when the finish has to be matched exactly, when stairs and floors must read as one, or when a designer wants a colour of their own.

Short answer: Unfinished engineered oak is supplied raw, then sanded and finished after it is laid. It gives one seamless surface without bevels, lets you choose any oil, lacquer or stain on site, and allows floors, stairs and joinery to be finished together. It takes longer to fit than prefinished oak because of the on-site finishing. Updated October 2026 by the LIGNORA flooring team

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Why choose unfinished

The finish is applied in the room, not the factory.

Seamless

One continuous surface

Sanded after laying, the floor has no bevels or factory edges, and the finish runs across every joint.

Colour

Any tone you choose

Oil, hardwax oil, lacquer or stain, mixed and tested on site against the room, the joinery and the light.

Matching

Floors, stairs and joinery

Treads, nosings and thresholds can be finished in the same pass, so everything matches exactly.

Sizes and grades

A wide unfinished range, in stock formats and long lengths.

What is available

Thickness: 14mm (3mm oak wear layer), 15mm (4mm) and 20mm (4mm, 5mm or 6mm)
Widths: 150mm, 190mm, 220mm, 240mm, 260mm and 300mm
Lengths: 1900mm and 2200mm boards, and long lengths from 600mm up to 3000mm in 260mm and 300mm widths
Grades: classic, select, prime and antique in European oak, plus prime grade American oak
Construction: multi-ply or 3-ply cores, tongue and groove, suitable for underfloor heating

Long-length boards typically take four to six weeks; other lead times are confirmed on your quote. Compare thicknesses in our thickness guide.

Finishing on site

Plan the finish before the floor goes down.

Unfinished boards should be laid, sanded and finished before decorators and other trades finish in the room, then protected until handover. Choose an oil for a natural, repairable surface, or a lacquer for the lowest upkeep — our oiled vs lacquered guide explains the difference.

Supplying to your own fitter? We send the technical sheets with the order. Want it fitted too? Tell us about your project and we'll talk you through the options.

Unfinished Engineered Oak,
Answered

The questions we are asked most often.

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What is unfinished engineered oak flooring?

Engineered oak with a raw, unsealed oak surface. It is laid first, then sanded and finished on site with oil, hardwax oil, lacquer or stain.

Why choose unfinished over prefinished?

For a seamless surface with no bevels, a colour mixed exactly for the room, or floors, stairs and joinery finished to match in one pass.

What thicknesses do you supply unfinished?

14mm with a 3mm oak wear layer, 15mm with 4mm, and 20mm with a 4mm, 5mm or 6mm wear layer.

Can unfinished engineered oak go over underfloor heating?

Yes. The engineered construction is suitable for underfloor heating; confirm the adhesive and finish for your system before fitting.

Do you supply long lengths?

Yes. Selected unfinished boards come in long lengths from 600mm up to 3000mm, in 260mm and 300mm widths.

Ask us about
your floor.

Send us a photo of the room and tell us about the subfloor and heating, and we will recommend the right board. Or order free samples to see them at home.

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