Southern PVC Systems LogoWhite Window fitted to houseWoodgrain Window Kit

Southern PVC Systems Ltd.

Unit 1, The Carrick Business Centre,

Bonville Road, Brislington,

Bristol. BS4 5NZ


Tel:- 0117 9710359......Fax:- 0117 9720998



how to order





synseal logo




fensa logo



Double Glazed PVC Windows.

double glazed window calculator

Double Glazed Window info

double glazed window brochure


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Triple Glazed PVC Windows

triple glazed windows price calculator

Triple Glazed Image

triple glazed detail

PVC Doors and French Doors

doors and french doors

Doors Information

doors brochure

Sliding Patio Doors

sliding doors

Sliding Patio Doors Information

sliding patio brochure

Sliding Sash PVC Windows

sliding sash windows

Sliding Sash Information.sliding sash brochure


Click the Green buttons to see our Online calculator and prices or the Blue buttons to see the product brochure.

For Prices using our Online Calculator, just enter the sizes of the windows you need using the slider bars or enter sizes directly into the boxes provided and you will be given prices for any size of window in any of the energy ratings for any of our profile options, scroll down to add cills or patterned glass and be able to print the results or save to your computer (help button available).

You can print out a single item or multiple items and send it to us as an order form, or call in and see us.

This website is optimised for easier navigation when using mobiles and tablets.

If you prefer to view on a PC you may prefer a traditional layout:-


multichambered frame section

All of the windows and doors that we make are made to measure, we do not stock ready-made items.


glass unit diagram

window energy ratings


triple glazed image




Important Notes

Maximum width of a side hung vent is 650mm
Maximum width of a top hung vent is 1250mm
Maximum height of a side hung vent is 1250mm
Maximum height of a top hung vent is 1250mm

Vent sizes are measured from edge of frame to centre line

Transom - Standard top vent drop is 350mm

Mullion - Standard side vent width is 600mm

Please deduct any tolerances for fitting and give us the actual manufactured sizes of the frames! OR:- If windows are to be fitted behind brick or stone apertures add for the overlap required.




Cill, 180mm wide, white, including end caps @ £8. per metre

Cill, 85mm wide 'stub' cill often used where there is an existing stone or tile cill, white @ £6 per metre

Frame extension, 20mm, £3. per metre.


White handles standard

Chrome handles...£3 each

Gold handles...£3 each

On woodgrain windows, gold or chrome handles included in price

Patterned 'patterned glass' on price calculator. View patterned glass designs here

Trickle/night vent ...£15 each


Extras for your window might include a trickle vent ,also called a night vent, this provides a small amout of secure ventilation whilst windows are closed. Or you might like to have a woodgrain effect for your windows, this is available in mahogany or light/golden oak. We can manufacture both coloured types either with colour visible on the inside and outside of your home or as coloured on the outside and white inside. we can also fit silver or gold handle instead of the standard white.



You can fill in the sizes of the window on our order form, alternatively you may wish to draw the window on a separate sheet.


Sliding Sash Windows. (uPVC)

uPVC sliding sash windows are available in white or woodgrain finishes.

Prices as shown on 'Sliding Sash Price calculator'

Wide range of configurations and furniture. Call in to see sample in showroom and discuss.



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Window Energy Ratings (WER’s)


Window energy ratings are A B C D E F Just like the labels on your new fridge/ washing machine.

A is the highest rating (most efficient), C is lower, and F is the lowest rating.
Building Regulations. From 1st October 2010,
The  building regulations require that a MINIMUM of C rating is used.
(or at least a U Value of 1.6 w/m2) 

Our Windows are made to A or B or C Rated

A rated is
Insulated frame, 6 chambered outerframe, 6 chambered sash with thermally reinforced mullions
with Glass unit. Low E Glass, Warm edge Spacer and Argon Filled.

B rated is
Insulated frame, 6 chambered outerframe, 6 chambered sash with thermally reinforced mullions
with glass unit, Low E Glass, Warm edge Spacer and Air Filled.

C rated is
Thermally reinforced or steel reinforced outerframe frame, thermally insulated sashes
With glass unit, Low E glass, aluminium spacer and air filled

A more detailed explanation......
The thermal efficiency of a window depends on the performance of both the Glass units and the frames.
The Specific calculations are quite complex, so to make it easier for the consumer to recognize the thermal quality of the windows, they have been banded into groups A, B, C etc.

Multi chambered frames are thermally more efficient than single chambered frames.
Most  frames are at least 3 chambered, the greater number of chambers increase the thermal efficiency. Our frames have 6 chambers

Latest Frame developments.....
We now have 6 chambers in the main outerframe profile  (See Photo above).
Thermal Inserts have also recently been introduced for mullions and transomes.
These effectively increase the number of “Thermal chambers” in the sashes and Mullions.
At the same time, rigidity of the frame is enhanced, so that usually, no further reinforcement is required.
In some circumstances, such as woodgrain profiles, additional steel reinforcement is applied.
But as this is fitted within the Thermal inserts, then thermal losses due to conductivity of steel are minimised.
Tests have shown that Furniture screws, into the Thermal Inserts of the sashes give similar screw retention properties as steel. Another advantage is that screws will have less tendency to corrode when applied to thermal inserts, rather than steel (as the screws are fitted, they leave swarf which corrodes & breaks down the screw coating).

Double Glazed glass units......

28mm overall thickness (4-20-4)  (see diagram above).

Generally, the larger airspace the better the thermal efficiency (up to 20mm airspace)
The addition of Argon gas (90% by volume) also improves the thermal efficiency.
“K” glass (hard coat Low Emissivity glass) on the inner (room side) improves thermal efficiency by reflecting radiated (infra red) energy back into the room.
Soft Coat “Low E” glass does the same as “K”glass, but much more efficiently.
Aluminium spacer bar is less thermally efficient than the new “Insulating”  spacer Bar.

Triple Glazing    (U Value 0.9 w/m)   plus enhanced noise insulation

40mm overall thickness (4-14-4-14-4)   (see photo above).
2 inner panes, Soft Coat low E glass, Insulating Spacer Bar, Argon Filled

28mm overall thickness (4-8-4-8-4) where standard 28mm bead is required
Or can be used to upgrade existing frames, to enhance Noise and thermal insulation.
(note, 28mm triple glazed is slightly lower insulation value than 40mm triple glazed)

Our Frames

Synseal “Shield” 70mm system is internally beaded, chamfered bead.
We now use 6 chambered outerframe as standard (on White profiles).
We now use “Egress” (Fire Escape) hinges on all side hung windows

We have copies of Full simulation reports from Synseal Extrusions Ltd. for the A,B andC ratings.
Each report is 10 pages. And can be viewed at our showroom.
Copies are available by post on request.

The reports are prepared by an approved Simulator (080) by
British Fenestration Registration Council
BFRC reports noSYN-00124-3  SYN-001246

British Standards Compliance

Where applicable, our products comply with the following British Standards....

BS 7413

BS EN ISO10077-2

BS EN ISO 9002

Kitemark Licence no KM30983 (Frames)

Kitemark Licence no KM 27701 (Glass)



Southern PVC Systems Limited,

Unit 1,

The Carrick Business Centre,

Bonville Road,





Telephone:- 01179 710359

Fax:- 01179 720998




Monday to Thursday 8.30am to 4.30pm (up to 8.00pm by arrangement) Friday 8.30am to 4.00pm only. After hours and Saturdays main phoneline transferred to a mobile.


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