Bay & Bow Windows in Hertfordshire
The window that gave the Victorian terrace its silhouette — and still the single most transformative replacement we fit. Structural corner posts, lead-lined roofs, cast-iron style detailing and A+ modern glass — a full bay swap in a day.
Bay & Bow Windows designed around Edwardian and Victorian bays along the A1(M) corridor — acoustic packages included.
St Albans, Harpenden, Watford, Hemel Hempstead and Berkhamsted — we cover Hertfordshire's full palette of Georgian, Edwardian and modern homes with a senior surveyor on the ground every week.
The A1(M) and A41 corridor means Hertfordshire homeowners consistently benefit from acoustic-rated glazing. We spec triple-glazed and laminated options that transform a home's soundscape.
Energy-efficient bay & bow windows installed across Hertfordshire achieve whole-window U-values of 0.9–1.4 W/m²K, with the exact frame and glazing specification confirmed after survey.
SpecificationSix-chamber uPVC or aluminium bay profile · steel-reinforced structural corner posts · lead-lined or GRP roof · argon-filled A+ glazing · Georgian bar & astragal options
What sets our bay & bow windows apart in Hertfordshire.
Structural Corner Posts
Steel-reinforced bay posts carry the load above — essential for 45° splayed bays and box bays that support first-floor masonry.
3-, 4- & 5-Facet
Splayed bays for Victorian terraces, box bays for Edwardian semis and shallow bows for cottages — all built to your survey template.
Lead-Lined Roofs
Traditional lead-flashed or GRP roofs matched to the existing bay, with proper flashing back to the brickwork and stepped over the parapet where required.
Replacement in a Day
In most cases we remove the tired 60s or 70s bay and refit the replacement inside a single working day — no exposed brickwork overnight.
Heritage or Modern
Traditional splayed bays with astragal bars and dummy sashes, or clean contemporary square bays in aluminium — matched to the age of the property.
Kerb Appeal
The single most valuable retrofit for a Victorian or Edwardian terrace — a restored bay adds visible property value and lifts the entire façade.
Bay & Bow Windows installed across Hertfordshire.
We regularly install bay & bow windows across Hertfordshire. Explore your town for local detail on planning, postcodes and recent work.
Common questions from Hertfordshire homeowners.
- Do I need Building Regs approval for a bay replacement?
- A like-for-like replacement on an existing bay is covered under CERTASS. If we're modifying the structural opening or replacing the roof, we may need to notify Building Control — we handle the paperwork either way.
- Will the bay stay up while you replace it?
- Yes — we prop the load above with acrow supports before removing the original frame, then install the new structural posts and transfer the load. The brickwork above is never unsupported.
- Can I keep the original lead roof?
- Usually yes if it's in good condition. Where the lead has failed or corroded we replace it with new milled lead in Code 4 or Code 5, or with a modern GRP roof for a longer service life.
- What's the difference between a bay and a bow?
- A bay window has three, four or five flat facets meeting at angles (usually 45°). A bow window is a shallow curved projection made of five or seven narrow lights. Both are supported the same way.
- What affects a bay window replacement?
- The number of facets, frame material, roof condition, structural supports and surrounding masonry all affect the specification. We survey the load path and existing roof before manufacture.
Related windows services in Hertfordshire.
Book your Hertfordshire survey.
Tell us about your Hertfordshire project. A senior surveyor will call within one working day to arrange a free on-site visit and fixed quote for your bay & bow windows.