Open-plan living space after a knock-through, London — Sharpline Construction
Open-plan living space after a knock-through, London — Sharpline Construction
Open-plan kitchen, London — Sharpline Construction
Open-plan kitchen, London — Sharpline Construction
Extension with steel beam opening, London — Sharpline Construction
Extension with steel beam opening, London — Sharpline Construction

New Door & Window Openings in London

Moving a doorway, widening an opening or adding garden doors means cutting into structure. We size the lintel or beam, get approval where needed, and make good so the new opening looks original.

Since 2013 · Fully insured · CSCS-carded, SMSTS-supervised · Free site visit and itemised written quote

What's included
  • Structural check and lintel sizing

  • Building Control where required

  • Temporary support and opening formation

  • Lintel or steel beam installation

  • Frames, plastering and making good

Price and time on site

Priced after a free site visit, with an itemised written quote.

Questions we're often asked
Does a new internal doorway need approval?

In a load-bearing wall, yes. In a stud wall, usually not. We check which it is.

Can a window become French doors?

Often yes, by lowering the opening with a new lintel and frame.

Other structural works services

Wall removal & RSJ · Chimney breast removal · All structural works

Often done together

Internal doors · Garage conversions · Wall removal & RSJ

Back to all domestic services.

Get a free quote

Send us your postcode and a few photos, or call 020 7476 2770 / 07903 854379. We'll arrange a free site visit and send an itemised written quotation. Get a free quote

© 2026. All rights reserved. Sharp Line Construction Ltd (trading as Sharpline) | Reg. Office: Chichester Close, London E6 5QJ | Company number 08639916 | VAT Reg. No. 426893265 | Privacy Policy

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