Bay window costs: stone repair, build and replacement prices

This page lists some of our costs and prices for restoring, repairing, building and replacing stone bay windows to the highest level of finish and craftsmanship.
We’re often asked: “How much does it cost to rebuild a stone bay window?” The answer is: Every bay window is different, so each project is priced individually.
We’ve listed some specific examples on this page to give you a sense of house exterior renovation costs.

Pictured: Stone bay window price guide image

Bay window crack repair cost, inc. masonry repair cost – section replacement price example

We replaced different sections of this Edwardian bay window in hand carved Bath stone. Our new stonework exactly replicated the sections of the bay window that had been damaged by steel beam during a rear extension to the house. Finchley, London. The cracked lintel above the window had led to the two front mullions (columns) also cracking over time. We planned the necessary repairs with the homeowner, and offered various options and prices.
Sections we hand carved and installed, include:
Stone mullions replacement cost. £2,464.00 + VAT.
New capitals. £2,695.00 + VAT.
New lintels. £3,135.00 + VAT.
Brickwork above bay window carefully removed, rebuilt and colour matched to blend in with the surrounding bricks. £1,804.00 + VAT.
Total: £10,098.00 + VAT

Pictured: Bay window section replacement by London Stonemasonry

Stone mullion replacement cost. Sill, mullions and brickwork replacement price example

We replaced the mullions, sills and all of the brickwork beneath this Edwardian bay window. Damage to the window had been caused by a car crashing into the front of the house.
We were able to support the lintels and then reuse the capitals and jambs.
All preparation work making the internal of the house secure prior to work commencing. £1,375.00 + VAT.
All temporary works supporting the lintels. £715.00 + VAT.
Replacing the mullions in Bath stone. £4,015.00 + VAT.
Replacement of the sills. £4,235.00 + VAT.
Brickwork and render externally and internally. £2,332.00 + VAT.
Total: £12,672.00 + VAT

Pictured: Sill, mullions and brickwork replaced by London Stonemasonry

Stone bay window partial rebuild cost example

We were able to rebuild this Victorian bay window, as we could save elements of the existing bay that hadn’t perished. Location: Finsbury, London.
The bay window sills to be replaced and the existing removed and disposed of. £4,004.00 + VAT.
Creation and installation of two carved, floral capitals. £4,631.00 + VAT.
All new jamb and mullion bases. £2,332.00 + VAT.
Creation and installation of two lintels. £2,541.00 + VAT.
Additional restoration to the stone elements of the bay that we were able to keep and reuse. £1,501.50 + VAT.
Total: £15,009.50 + VAT

Pictured: Stone bay window partial rebuild, by London Stonemasonry

Victorian bay window replacement cost example

Bay window replacement, Hampton, London
We removed the existing bay window and then supplied and installed a new hand carved bay window to replicate their neighbour’s.
Recessed the internal gutter system into the top of the cornice and lead line. This meant that there was no need for any external guttering which does make for a much cleaner aesthetic.
We also built a new roof using welsh slate and full lead flashing and rolls.
Total: £19,305.00 + VAT

Pictured: Victorian bay window hand carved by London Stonemasonry

New, hand carved, Bath stone bay window price example.

We removed the existing brickwork that formed the Victorian bay window elements and supplied and installed a new hand carved, Bath stone bay window to replicate their neighbour’s. Location: Wanstead, London.
We had to support the 1st floor brickwork and bay window and install the new bay window without disturbing the building above and having any movement.
We then had to rebuild the brickwork between the cornice of the new bay window and the sills of the 1st floor. This was to level the brickwork as it was out of level by 80mm over the length of the bay window. This had to be undertaken by removing 5-10 bricks at a time, and then reinstalling new bricks on the correct level. This was to ensure that there was structural stability at all points.
Total: £20,405.00 + VAT

Bay window restoration in Bath stone by London Stonemasonry

Pictured: New Bath stone bay window by London Stonemasonry

Get in touch for more information

Over the years we’ve worked on hundreds of bay windows across London. We offer the full package. Our skilled team decorates, repairs, replaces and restores stonework to the highest level of finish and craftsmanship. We work on stone windows from all periods, including: Victorian, Georgian and Edwardian.

Costs vary due to many factors including; site access, raw materials and the complexity of the work required.

Masonry repair costs: more information

London’s period homes deserve careful, informed restoration. At London Stonemasonry we don’t just restore stone bay windows, we repair, replace, renovate and restore every façade element, including brick, carved stone, stucco, window surrounds, steps and paving..

Here is a brief guide to masonry repair costs, and what drives them:

Services we offer, include

Brickwork: lime repointing, brick indents, gauged arches and local rebuilds
Carved and dressed stone: cills, lintels, strings, cornices, capitals and plastic repairs
Stucco and render: lime-based patch repairs, recoats and moulding reformation
Cleaning and conservation: nebulous water, steam, micro-abrasive and poultice methods, with trials
Windows, reveals and lintels: perimeter pointing, sub-sills, bearing checks and replacements
Parapets and copings: re-bedding, throatings, lime pointing and lead flashings
Steps, thresholds and paving: Yorkstone / sandstone flights, waterproofed thresholds, plinths and railing bases
Access and protection: scaffold design, wraps, licences, neighbour liaison and through-house protection

How we keep pricing clear

Survey first & measured take-offs: we price in plain units – so each line of scope is transparent.
Options and value: repair-first specifications, breathable systems and combined trades under one scaffold typically reduce total spend.

What influences cost, examples

Property context: age, construction type, listing status and conservation area controls shape method and approvals.
Scope and severity: localised repairs sit at one end; full-elevation restoration with carved replacements and parapet works sits at the other. Structural issues and waterproofing add temporary works and sequencing.
Access and logistics: scaffold height, pavement licences, red-route constraints and rear access through the property etc.
Element complexity: tuck pointing, gauged arches, fine mouldings and carved profiles require specialist hours; detail is the time driver.
Materials and matching: like-for-like bricks (often imperial), Bath or Portland stone, compatible lime mortars and brick specials carry lead times that can affect the programme.
Compliance and permissions: listed building consent, conservation officer reviews and Party Wall procedures add hold points but reduce risk and rework.
Season and programme: e.g. lime needs controlled curing; trials. Sample panels de-risk finish quality and can keep long-term costs down.
Unknowns and contingency: opening-up may reveal salts, trapped moisture or corroded cramps; sensible allowances avoid surprises.

Next steps

Ready to enhance your home? Get in touch with London Stonemasonry for a clear plan, realistic masonry repair costs and heritage-grade results.