WINDOW AND DOOR GUIDE

Timber casement windows

At Green Home Glazing we have architectural, environmental, design and construction expertise and we are here to assist you with choosing the right solution for your home project.

This is why we have prepared this Guide on timber casement windows:

  • to answer your most common questions,
  • to inform you on what adds value and what works best, and
  • help you understand the best options for your budget and requirements.

VALUE + MONEY

  • Are timber casement windows expensive?
  • Are wood windows better than vinyl?
  • Are wood windows worth the money?

We are suppliers and installers of timber casement windows and doors and we work directly with manufacturers to source the best products to match your requirements and do so at the best price possible.

Are upvc casement window prices lower when compared to wooden casement windows prices?

Of course they are.

Is installing upvc sash windows a false economy that will likely lose you money in the long run?

Of course it is.

There are many myths about all this and it is true that plastic frames have pretty much the same energy efficiency to any type of similar wooden sash windows. However, research finds that plastic needs to be replaced every 35 years compared to 60 years for wood.

Therefore, and similarly to timber framed sash windows, you benefit over the product lifetime as timber casement windows are more economic in the long run, especially if you choose to install triple or double glazed casement windows for your home project.

 

STYLE + AESTHETICS

  • What are flush casement windows?
  • What are stormproof casement windows?
  • What are tilt and turn casement windows?

At Green Home Glazing we will match the design and style of your existing windows.

Casement windows can open inwards or outwards. Tilt and turn windows have a dual opening mechanism and a dual opening function which means you can open the same window into two different ways depending on how much ventilation you need in the room.

“Stormproof” casement windows have the window panel sitting proud of the window frame and they are considered the be the most weatherproof type; “they will protect your home from the storm outside” and this is how they got their name.

Flush casement windows have the window panel sitting flush within the window frame in a contemporary arrangement and style. But do not worry, flush casement windows will also protect your home from the storm outside!

Our specialist surveyors will measure the existing structural window openings, record the appearance of the timber frames and the window panels, and prepare detailed drawings for you to approve before we manufacture your new timber casement windows.

Your new windows will be manufactured always by timber sourced sustainably (FSC® certificate), from a variety of high quality species (Pine, Oak, Mahogany, Larch, Accoya), in a wide choice of colours for varnishes and paints, with hardware mechanisms made of stainless steel, coated with zinc and aluminium.

 

ECONOMY + COMFORT

  • Are wood windows energy efficient?
  • What type of window is most energy efficient?
  • Should I go for double glazed casement windows or triple glazed casement windows?

The Centre for Alternative Technology recommends timber-framed windows unequivocally. Hardwood (FSC-certified) or durable softwood frames come from a renewable source, use comparatively little energy in manufacture, with regular maintenance will last decades and can be repaired easily.

Also, according to the Energy Saving Trust, benefits of energy efficient windows include:

A more comfortable home – Energy efficient glazing reduces heat loss through windows and means fewer draughts and cold spots.

Peace and quiet – Not only do they keep the heat in, energy efficient windows insulate your home against external noise.

Reduced condensation – Energy efficient glazing reduces condensation build up on the inside of windows.

As well as style,  comfort is a key reason to go for triple glazed wooden casement windows:

“If you insulate the walls, roof and floor of a house, and you ignore the glazing, you end up with cold spots surrounding the windows at night, which cause draughts, draw heat away from you if you sit next to them, and result in streams of condensation running down the panes.

 So, in essence, the standard of glazing has to match the standard of the insulation elsewhere in the house, so that the warm wrapping around the house performs consistently.” Homebuilding & Renovating

 

HERITAGE + CONSERVATION

  • Can you put new timber casement windows in a Grade 1, 2*, 2 Listed building?
  • Do you need planning permission to replace timber casement windows in a conservation area?
  • Are upvc windows allowed in a conservation area?

At Green Home Glazing you will get expert architectural advice by our director is a Chartered Architect with the Royal Institute of British Architects (RIBA)  and has extensive residential experience with Listed Buildings and properties in Conservation Areas across London (see GOAStudio London residential architecture).

Also, read the residential guide to homeowners George wrote for Which? Magazine.

Any alterations of doors and windows to Listed Buildings will require prior Listed Building Consent (Grade I, II* and II) and Full Planning approval; the conservation team of your local authority will review the submitted proposals and will take a view on the right type of window, glazing and details for the building.

Historic England advises that “where a window that diminishes the significance of the building, such as a PVCu window or an ‘off the peg’ timber window of an inappropriate pattern, is to be replaced the new window should be designed to be in keeping with the period and architectural style of the building.

 It may be possible to base the design on windows that survive elsewhere in the building or it may be necessary to look for examples in other buildings of the same period and style close by. The local planning authority may also be able to offer advice. In some cases this may involve reinstating the structural masonry opening to the correct proportions.”

A similar approval process is necessary if your property is in a Conservation Area; typically in Conservation Areas the Council removed Permitted Development Rights to properties which means that any alterations to the size, location and type of doors and windows requires planning approval for both single family dwellings and flats.

Green Home Glazing has the expertise to advise and apply on your behalf for all the approvals you will need, including Listed Building Consent, planning, Building Regulations and Freeholder approvals.

 

SUSTAINABILITY + ENVIRONMENT

  • What are the environmental advantages of wooden casement windows?
  • What are the environmental disadvantages of wooden casement windows?
  • Should I go for softwood or hardwood for my casement windows?

There are intrinsic and undeniable environmental advantages of using timber in construction, including in the manufacturing of timber casement windows, when choosing wood from sustainably managed forests.

Wood is naturally renewable, low carbon, and using wood helps take carbon from the atmosphere making it the most sustainable mainstream building product. Over 90% of timber used in UK construction comes from Europe, where more trees are grown than harvested (source: TTF Statistical Review 2016).

The GreenSpec assessment of the relative environmental impact of timber framed windows is as follows:

01 FSC durable temperate hardwood (oak, larch, sweet chestnut)

Pro      Down – cyclable as fuel

Pro      Low embodied energy

Pro      Timber sequesters carbon dioxide

Pro      Renewable resource

Pro      Low maintenance – doesn’t need painting or preservatives

Pro      Very durable

Pro      Good thermal performance

  • Design life: 30 years
  • BRE Green Guide rating – Domestic; solvent borne gloss paint / water based stain; double-glazed: A+
  • Conductivity – Oak and similar: 0.16 W/mK

02 FSC temperate softwood treated with plant based paint systems

Pro      Down – cyclable as fuel

Pro      Low embodied energy

Pro      Timber sequesters carbon dioxide

Pro      Renewable resource

Pro      Moderately durable

Pro      Easy to repair

Pro      Good thermal performance

Con    Moisture ingress can lead to warping and twisting

Con    Maintenance is usually required (eg re-painting/staining on a 5 year cycle)

  • Design life: 25 years
  • BRE Green Guide rating – Domestic;

Preservative pre-treated softwood window, double glazed, water based stain (TWAS): A+

  • Other solvent borne gloss paint and water based stains: A
  • Conductivity Softwood: 0.12 – 0.14 W/mK

03 Aluminium-clad FSC temperate softwood

Pro      Wood is down-cyclable as fuel; aluminium is recyclable

Pro      Timber sequesters carbon dioxide and is a renewable resource

Pro      Requires almost no external maintenance

Pro      Low maintenance – doesn’t need painting or preservatives

Pro      Very durable

Pro      Good thermal performance

Con    Embodied energy from Aluminium smelting

  • Design life: 30 – 50 years
  • BRE Green Guide rating

Domestic; Powder coated aluminium clad softwood window, double glazed, solvent borne gloss paint / water based stain internally: D

  • Conductivity

Softwood: 0.12 – 0.14 W/mK

Aluminium cladding: 45 W/mK

NOISE + SOUNDPROOFING

  • How do I block outside noise in my bedroom?
  • How can I reduce noise when living on a busy street?
  • What are the best windows for noise reduction?

One of the key benefits of triple glazing is that can significantly contribute to improved acoustic performance and noise reduction.

 According to Homebuilding & Renovating:

 “Double-glazed windows can achieve an acoustic performance in the range of Rw32. This can be improved into the low 40s with some types of triple glazing — the difference on a busy road between a good night’s sleep and a disrupted one.”

 At Green Home Glazing we will help you select the best timber casement window product for noise reduction and through our Full Installation Service we will seal the area surrounding your windows to ensure there are no empty spaces or openings where sound can travel by.

Typically a standard double glazed unit with two 4mm panes of glass and an air cavity will reduce noise by around 25dB.

Our triple glazed timber windows can be manufactured with at least one layer of acoustic laminated glass, glass panels of different thicknesses, and the window can be acoustically treated in order to create a noise reduction of around 45dB as the sound waves get absorbed by the glass panels.

Note that a noise reduction factor of 10dB equates to a 50% reduction in the volume of a noise, which is a substantial reduction that is enough to create a much quieter home environment and make any external noise much less noticeable.

SECURITY + SAFETY

  • Are casement windows easy to break into?
  • Are casement windows secure?
  • How do you lock a casement window?

Homesecuritycity.com notes that casement windows are the safer option for your home when they are closed and latched because it can not be opened from the outside. In more detail:

Overall Safety – Casement windows are impossible to open from the outside unless the glass is broken, hence they have a higher safety level overall.

 Breakability – Casement windows are hard to break into. When closed, and latched the seal is very tight and the only way to enter would be to break the glass.

Thickness of Glass – minimum ¾ inches thick recommended.

In order to improve security our double and triple glazed window units can come with the following glazing options:

Toughened – to increase strength and safety

Laminated – to provide additional security compared to toughened glass

Obscure – to improve privacy to windows

For increased security our windows come with long-lasting GU hardware mechanisms made of stainless steel, coated with zinc and aluminium that include multi-point locks. Common casement window locks include automatic licks, press button locks, swing locks, window mortice security bolts and pivot locks.

 

Why Us

Our offer – We offer triple glazing for the price of double glazing as standard for all quotes across Greater London.

Our full service – Uniquely we offer a full service that includes architectural advice, obtaining all approvals on your behalf, as well as supply and fitting of window and door products.

Our architectural, environmental, and design expertise – By our Architect Director (RIBA Chartered member and registered with ARB), George Omalianakis | GOAStudio London residential architecture limited.

Our construction expertise – By our Builder Director (Federation of Master Builders member), Kia Karamian | Dream Building limited.

Our manufacturers – We work directly with vetted manufacturers which allows us to control the quality, design and cost of the window and door products we will provide for your home.

TIMBER CASEMENT WINDOW – LOW ENERGY TIMBER WINDOWS “94”

 

“94” windows are made from wide 94 mm profile with 52 mm width insulated triple-glazed units filled with argon gas – this technology ensures exclusive heat and sound insulation.


PRODUCT SPECIFICATIONS

– New generation energy efficient timber windows.
– Excellent energy performance – helps to reduce heating costs, suitable for passive houses.
– Heat transfer coefficient U=0.83 W/m2K
(U-value is calculated for the standard dimensions 1230*1480).
– Wide 94 mm profile made of 4 layers of exclusive wood beam.
– Highest quality wood: Pine, Oak, Mahogany, Larch, exotic wood.
– 52 mm insulated triple-glazed units with warm thermal spacers.
– Superior quality GUARDIAN, EUROGLAS, SAINT-GOBAIN selective glass.
– Triple sealing system (sash, frame and glazing bead) provides extremely good heat and sound insulation.
– Long-lasting GU hardware mechanisms made of stainless steel, coated with zinc and aluminium.
– Effective window protection from condensation.
– Wide choice of colours for REMMERS varnishes and paints.
– Modern ecological and durable timber, FSC® certificate.

TIMBER CASEMENT WINDOW – TIMBER WINDOWS “78”

 

Wooden windows “78” are made from unique 78 mm profile system, which rounded corners not only protect the window from water and dirt, but also improve the appearance of the product. This profile due to its stability is very suitable for particularly large windows.

PRODUCT SPECIFICATIONS

– High quality energy efficient timber windows.
– Heat transfer coefficient U=1 W/m2K
(U-value is calculated for the standard dimensions 1230*1480).
– 78 mm profile made of 3 layers of exclusive wood beam.
– Highest quality wood: Pine, Oak, Mahogany, Larch.
– Up to 42 mm double-glazed or triple-glazed units.
– Superior quality GUARDIAN, EUROGLAS, SAINT-GOBAIN selective glass.
– Triple sealing system (sash, frame and glazing bead) provides extremely good heat and sound insulation.
– Long-lasting GU hardware mechanisms made of stainless steel, coated with zinc and aluminium.
– Effective window protection from condensation.
– Wide choice of colours for REMMERS varnishes and paints.
– Modern ecological and durable timber, FSC® certificate.

TIMBER CASEMENT WINDOW – TIMBER AND ALUMINIUM WINDOW “MIRA”

 

“94” windows are made from wide 94 mm profile with 52 mm width insulated triple-glazed units filled with argon gas – this technology ensures exclusive heat and sound insulation.


PRODUCT SPECIFICATIONS

– New generation energy efficient timber windows.
– Excellent energy performance – helps to reduce heating costs, suitable for passive houses.
– Heat transfer coefficient U=0.83 W/m2K
(U-value is calculated for the standard dimensions 1230*1480).
– Wide 94 mm profile made of 4 layers of exclusive wood beam.
– Highest quality wood: Pine, Oak, Mahogany, Larch, exotic wood.
– 52 mm insulated triple-glazed units with warm thermal spacers.
– Superior quality GUARDIAN, EUROGLAS, SAINT-GOBAIN selective glass.
– Triple sealing system (sash, frame and glazing bead) provides extremely good heat and sound insulation.
– Long-lasting GU hardware mechanisms made of stainless steel, coated with zinc and aluminium.
– Effective window protection from condensation.
– Wide choice of colours for REMMERS varnishes and paints.
– Modern ecological and durable timber, FSC® certificate.

Links to our other product range

Traditional timber sash windows
Timber Casement Windows
Sliding Patio Bifold Doors
Aluminium Doors & Windows
Steel Windows & Doors
Glazing

VALUE + MONEY

STYLE + AESTHETICS

COMFORT + ECONOMY

HERITAGE + CONSERVATION

ENVIRONMENT + SUSTAINABILITY

NOISE + SOUNDPROOFING

SAFETY + SECURITY

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