Technical Details For Hampton Conservatories


Technical Details

Here at Hampton Conservatories, we want to work with you to create the best end product possible. The sections below outline our technical details which enable us to achieve this.

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Sapele Mahogany

Sapele Mahogany is one of the densest and most durable mahoganys available, making it more suitable for external joinery and the preferred material for producing high quality furniture.

Sapele Mahogany also has a very fine texture due to its dense grain and molecular structure, this results in a particularly high quality paint finish, often not present when using other hardwoods, as they tend to be softer with a more open grain which leaves an orange peel finish to the paintwork. Many other manufacturers use the term hardwood, as opposed to mahogany, as many suppliers will use timber that cannot by law be described as mahogany. All timber used in our glazed extensions - i.e. frames, sashes, upstands, rafters, ridge and pilasters, is manufactured from Sapele Mahogany.

Long timber elements are often laminated in our factory to give additional length and comply with engineering requirements. Hampton Conservatories’ doors and sashes are also manufactured from engineered laminated Sapele Mahogany for added stability. Sill boards and wall infill panels are made from birch plywood, whilst frieze board is manufactured from both birch plywood and Sapele Mahogany. Softwood timber is used for the studding of box gutter support ladders. All of our mahogany is kiln dried and selected to British Standards.



Accoya wood is a brand of timber that has been put through a process that alters the actual cell structure of wood. The process is called acetylation and is the result of over 75 years of scientific research.

Timber that has not gone through this modification process absorbs and releases water depending on the weather, causing the wood to expand and contract. This can result in the wood splitting or rotting over time. Accoya wood has been modified to reduce its cell walls, meaning it will absorb around 80% less water than traditional woods. This increases the timbers dimensional stability and lowers maintenance frequency.

In addition, due to the change that has happened in the cell structure of the wood, fungi do not recognise Accoya as wood and therefore don’t target it. Wood eating insects are unable to survive on Accoya wood.

Accoya is used in all our wood glazed extensions as it is the best material available for the purpose and can be finished to a very high look and feel. Due to its rot resistance qualities it is used in the sash sills, orangery entablature mouldings, external sills and timber pilasters of our glazed extensions.



Most commonly, Tulipwood is the pinkish yellowish wood yielded from the tulip tree, found on the Eastern side of North America. In the United States, it is commonly known as tulip poplar or yellow poplar, even though the tree is not related to the poplars.

Tulipwood is very stable timber and is used internally on plate rails, crown mouldings and trims within our glazed extensions.

Aluminium Roof

All of our glazed extensions have double glazed roof units held in place by powder coated aluminium roof cappings and rubber seals. These are secured to the hardwood rafters below with stainless steel screws which gives a water tight compression seal. The top of the capping is trimmed with a powder coated top cap which covers the screw heads and provides a smooth finished look to the roof. Depending on design requirements, the aluminium valley gutters are powder coated to match the exterior colour of the glazed extension or in a lead colour. This ensures a water tight and maintenance free connection at this crucial point. There are a large variety of aluminium powder coated finials and cresting available to complement the architecture of the building.


Hampton Conservatories' double-glazed roof units comprise of an internal pane 4mm clear planitherm toughened glass; 16mm argon filled cavity; 4 or 6mm of Sunergy; Self-Cleaning Active; Clear/Grey Anti-Sun or Active Neutral, depending on the building's orientation and customer requirements. This external pane will always be toughened in either 4 or 6 mm depending on the size of the unit. Regarding thermal insulation, the spacer bar within the glass gives a complete thermally optimised system. Spacer bars are normally black, but silver and white are also an option. Our roof units give a 1.1. U value and comply with building control regulations.

Hampton Conservatories' door and window double-glazing units feature an internal pane comprising of 4mm clear planitherm toughened glass; 12mm argon filled cavity; and a 4mm clear toughened glass external pane with spacer bar, ensuring outstanding thermal insulation. Again, these are normally black however white and silver are available. Of course, all glass complies with Building Control Regulations.

There are different variations of both roof and side glass that can be chosen to suit your particular needs. For example, a more southerly facing glazed extension will naturally get more sun. Therefore, a reflective glass would be installed, reducing heat by up to 50% and cutting down on UV penetration. Perhaps a self-cleaning glass would be preferred if the building is close to trees, some of the glass options available are in clear, grey, bronze or blue. However as standard, clear glass is normally used as this tends to be the more aesthetically pleasing option.


The structure of our products are hand prepared for painting. Before glazing, they receive an essential base primer coat followed by two coats of factory spray finish. The paint system we use is water based and low maintenance, specially designed for use with our hardwood. The structure is fully factory finished prior to dispatch.

There are 36 traditional and heritage colours to choose from, with a life expectancy of 5 to 8 years to be expected. However, regular maintenance of the paint is essential, which entails washing with a mild soap and water 2 to 3 times per year. Moreover, any joints or small breakdowns in the paintwork which are caused due to timber movement should be addressed immediately.

At Hampton Conservatories, we take the hassle out of maintenance by offering a maintenance contract to our customers, which involves servicing and carrying out general maintenance on an annual basis


Our high-quality hardware is designed specifically for Hampton Conservatories' profiles. The wide range of door and window accessories can be finished in brass, bronze, satin or polished nickel to complement the specific structure. We have a variety of different styles to suit either modern or traditional designs. It is these detailed finishes that can make your glazed extension feel complete.

Design & Detail

Casement style windows are not like any others, which tend to be flush. Hampton Conservatories sashes have a 10 mm step back from the face of the frame. This creates a unique shadow line and a sense of depth to the window and gives it a characteristic look. Our windows have a double seal foam filled nylon gasket and additionally, they are designed with a bevelled sill for natural drainage. Internally the frame has a traditional pencil mould beading of traditional casement and sliding sash windows.

Timber pilaster used externally, are schematically correct both in the design and proportions. Our frieze detail on our glazed extensions is based on classical architectural proportioning, many other companies try to reproduce this but do not have the design skills necessary which end up with the customer having something that is not just quite right.

The fenestration used on our window designs is particularly slim; it is bevelled on the outside to recreate a traditional finish. Internally it is moulded with what is known as lamb's tongue profile, typical of early single glazed fenestration detailing.


Ventilation is, without a doubt, one of the most important considerations when planning your glazed extension. For maximum efficiency, we recommend electric thermostatically-controlled roof vents with rain sensors. We design and manufacture these vents in our factory so any width from 700mm to 1500mm is possible. This enables optimum circulation of fresh air to keep your glazed extension at a comfortable pre-determined temperature, all year round.

Both side or top hung windows are available and, if your design permits, top hung clearstory sashes. These may be fitted with restrictors and security locks to combine ventilation with safety and security. Large outward opening doors may be held open by solid heavy-gauge cabin hooks that are attached to the frame of the glazed extensions.


At Hampton Conservatories we are very conscious that security is of utmost importance to our clients. We use toughened double-glazed panels on the roof and sides of all our structures. This glazing is five times stronger than ordinary glass and the sashes are designed with internal glazing slips, so that glass cannot be removed from outside. The window handles of opening sashes are morticed deep into the mahogany frame and the casement stay has a threaded locking screw for additional security.

In double door sets, both doors have an internal full-length locking mechanism, which has the "Secured by Design" certification. The fixed door can only be opened by means of a thumb turn in the lock at waist height, when the slave door is already open, so there are no difficult surface mounted shoot-bolts to worry about.

We can also provide additional security features, on request. These include 8.4mm toughened laminated glass, deadbolts to the windows and the installation of alarm system wiring through the timber framework of our structures.


We realise that our clients have busy lives and don't always have the time or inclination to undertake or organise routine, but essential, maintenance. Therefore, we have designed our own annual programme to make this as easy and hassle-free as possible.

By entering into an optional on-going maintenance contract, with Hampton Conservatories, you will receive a yearly visit from our maintenance team, who will carry out a thorough inspection and service of your glazed structure. This will be based on a comprehensive checklist, created specifically for your particular installation.

All our technicians are trained and employed solely by Hampton Conservatories, so have extensive knowledge of our products and manufacturing techniques, as well as years of experience installing and taking care of our products. A maintenance contract with us will give you long-term peace of mind and the knowledge that your investment is being properly cared for, year after year, without you having to worry about organising annual upkeep. After the annual inspection and any necessary work has been completed, you can look forward to relaxing and enjoying your glazed extension, safe in the knowledge that we will be back next year to care for it again and ensuring that you can fully enjoy your glazed extensions from Hampton Conservatories for decades to come.

Gutters, Downpipes & Hoppers

The custom-made gutter system featured on all of our glazed extensions have been designed by us using classic principles. We create dies and extrude made-to-measure aluminium gutters for each individual project. Two profile options are available, depending on whether the glazed extension is Classical or Victorian in design. Both options are fabricated in a heavy 3mm gauge of seamless aluminium. We carry out all tig-welding and manufacture of outlets, stop ends, gutter angles and overflows, in the metal work department of our factory.

Box Gutters & Entablature Flashings

The unique roof trim designs that feature in all Hampton Conservatories’ projects are very different from those manufactured by other companies. Our glazed extensions incorporate a combination of aluminium and steel out-riggers, structural ladders and supports, which are combined with aluminium box gutters.

We use both folded box gutters and our own extruded aluminium box gutters. They are designed to be completely watertight and are finished in a lead colour to match the roof trims. Both colour options: Lead (7022) or Blackened Lead (9044) may be seen in our paint colour chart.

Double Glazed Roof

Our double-glazed roof units comprise an internal pane of 4mm clear planitherm toughened glass, a 16mm argon-filled cavity and either a 4 or 6mm external pane (depending on the size of the unit). The external pane will always be toughened, for safety and security.

The spacer bar, within the glass, provides a complete thermally-optimised system, which satisfies our rigorous thermal insulation requirements. Black is that standard colour for our spacer bars, but we also offer white or silver as an option, at no extra cost. Our roof units have a U value of 1.1, which easily meets current building control requirements.

Doors & Windows

Double-glazed units, used in the doors and windows of all Hampton Conservatories glazed extensions

, comprise an internal pane of 4mm clear planitherm toughened glass, a 12mm argon filled cavity and a 4mm clear toughened glass external pane with spacer bar. This, again, ensures outstanding thermal insulation. As with the roof units, our door and window spacer bars are normally black. However white and silver are available, at no extra cost. All glass complies with current Building Control Regulations.

Case Studies


Pool House

This award-winning pool enclosure was designed and manufactured by Hamptons, with curved glass to replicate the detail of two mid-19th century glasshouses on the property.

Read Case Study

Rosleague Hotel

Tucked away near the beautiful Connemara town of Letterfrack, just fifteen kilometres from the buzzing town of Clifden, the Manor has been discreetly converted into a first-class hotel with the help of a Victorian style Hampton conservatory.

Read Case Study