Replacement windows are new frames and sealed double- or triple-glazed units fitted into your existing openings after the old windows are taken out, improving warmth, security and noise reduction while meeting current building regulations.
For a homeowner in Brentwood, planning replacement windows tends to begin with two questions: what will it cost, and how disruptive will it be? Our guide range is £4,700–£9,400 including VAT, and a typical job runs to 1–2 days on site for a typical house. Both numbers firm up once we have seen the property, measured up and agreed exactly what is included.
- Guide price
- £4,700–£9,400 inc VAT
- Time on site
- 1–2 days on site for a typical house
- Postcodes
- CM13, CM14 and CM15
- Planning rules
- England
- Local area
- Essex
- Survey
- Free, with a written quote
What should you budget for replacement windows in Brentwood?
The table below shows guide prices for replacement windows in Brentwood. They are based on rates in the East of England, which run about 5% above the national guide, giving an overall range of £4,700–£9,400. All figures include VAT and are firmed up after a free site survey.
| Type of job | What it usually involves | Guide in Brentwood |
|---|---|---|
| One to three windows | Replacing a few problem windows, such as a bay or a rotten kitchen window, in uPVC. | £750–£3,200 |
| Whole house in uPVC | Eight to ten standard uPVC casement windows on a typical 3-bed semi, fitted and finished. | £4,700–£7,900 |
| Whole house in aluminium or flush sash | Premium frames, colours or period styles across a typical 3-bed home. | £7,900–£14,500 |
What moves the price up or down:
- Number and size of windows, including bays and large picture windows
- Glazing type: double, triple, acoustic, obscure or toughened
- Window style, such as sash, flush sash or tilt-and-turn
- Upper-floor access, scaffolding and the condition of reveals and sills
What do you get?
- Measured survey of every opening, with sizes checked before manufacture
- Made-to-measure frames in your chosen material, colour and style
- Double-glazed units as standard, with triple glazing as an option
- Careful removal and disposal of the old frames and glass
- New internal trims, external cills and neat sealant finishing
- Building regulations sign-off arranged and paperwork handed over
Homes in Essex
Essex ranges from timber-framed and weatherboarded cottages in the north, some with decorative pargeting, to Victorian terraces in Colchester, Chelmsford and Southend. Basildon and Harlow were built as post-war new towns, much of the south-east has interwar suburbs and bungalows, and large new estates continue to appear around Chelmsford and Braintree.
Essex is one of the driest counties in England, and London Clay in the south shrinks in dry spells, so trees and foundation depth matter.
These patterns matter for replacement windows: older walls, roofs and floors in Brentwood can need different materials or extra preparation compared with newer homes.
Permissions for replacement windows in Brentwood
Planning law differs across the UK. For a home in Brentwood, it is the England rules below that count, and we check them with the council ahead of any quote.
Replacing windows and doors on a house is usually permitted development in England when the new ones look broadly similar to the old. Flats, listed buildings and homes covered by an Article 4 direction can need consent, and conservation areas may limit materials or styles.
Replacement windows and external doors must meet Building Regulations for energy efficiency, ventilation and, on upper floors, escape. The work is either self-certified by an installer registered with a competent person scheme or signed off by building control.
Rules change and every property is different, so we check the planning history and constraints for your address before we quote.
From survey to handover
Survey and measure
It starts with a survey at the property, free of charge. We check condition, access and services, ask how you want the finished result to look, and answer any questions you have about replacement windows.
Price and scope agreed
Next you receive a written quote with a fixed price for the agreed specification. It lists what is included, what is not, and how payments are staged, so you can compare it properly.
Dates and permissions
Before anyone starts, we confirm the programme in writing, check whether consents are required and arrange deliveries. If a skip or scaffolding on the road needs a permit, we apply for it.
On site to finish
During the work we protect the areas around it and tidy up at the end of each day. Once complete, we check the finish, remove our materials and hand over paperwork such as building control sign-off where it applies.
Working with SK Home Improvements
Frequently asked questions
Is triple glazing worth paying extra for?
Triple glazing adds a third pane of glass, which cuts heat loss and outside noise further than standard double glazing. It typically adds around a third to the cost of the glass units and makes opening sashes heavier. It makes most sense on cold or noisy elevations, or in homes being upgraded to a high energy standard. For many houses, modern double glazing with a warm edge spacer gives most of the benefit for less money.
What happens on the day the windows are fitted?
On fitting day we lay dust sheets, protect floors and furniture near each window, and then remove the old frame carefully to limit damage to plaster. The new frame is fixed, packed, sealed and glazed, and internal trims and external cills are finished. We take away the old windows and clean the glass before leaving. You only need to clear sills and take down curtains and blinds.
Do I need planning permission in Brentwood?
It depends on the work, the size of the project, your property type and whether the building is listed or in a conservation area. Brentwood is in England, so England's rules apply. Many smaller jobs need no planning application, but some still need building control approval. We check what applies to your address before quoting.
How much do replacement windows cost?
Replacement windows for a typical 3-bed semi cost £4,700–£9,400, depending on the number of windows, frame material and glazing. A single standard uPVC casement usually works out at roughly £500–£950 fitted, while aluminium, flush sash and sliding sash styles cost more. Bays, large panes and upstairs access add to the price. We measure every opening during the survey and give you a fixed price for the agreed specification.
Is the price fixed?
Yes, for the specification we agree. Your written quote sets out exactly what is included at a fixed price. It only changes if you ask for something different, or if a problem the survey could not reasonably reveal later needs extra work. In either case we explain the change and confirm it in writing before going ahead.
Also covering areas around Brentwood
Our coverage in Brentwood includes CM13, CM14 and CM15. We also travel to Billericay, Hornchurch and Romford, so neighbouring addresses are looked after on exactly the same terms as those in town.