Timber glazing upgrades in Grantham
Thermal and glazing upgrades to timber windows and doors you already own, so you gain performance without losing the joinery. Covering Grantham and the wider Lincolnshire area.
- Made to size from a measured survey, never cut down from stock
- FSC-certified timber with chain-of-custody paperwork
- Fixed written quotation with the lead time stated
- 10-year workmanship guarantee in writing
Free measured survey · No obligation · Reply within one working day
Quote for Grantham
Free measured survey in Grantham.
Timber glazing upgrades in Grantham
The Draught Sealing we make for Grantham is set out from a survey, not a size chart. Local property is overwhelmingly Georgian Stamford limestone, fenland farmhouses and coastal resort bungalows, which is why we never quote from a catalogue. Then there is low rainfall with severe exposed easterly wind off the North Sea, which reliably produces wind-driven rain ingress and sand abrasion on coastal finishes given enough seasons. Our focus on this is sealing the perimeter without making anything stiff to open.
We check on site before committing anything to the saw, and we query what does not add up. Tell us what you are working with and we will put a fixed figure in writing.
Worth knowing locally: Stamford is one of England's most tightly controlled conservation towns.
What we cover locally
- Retrofit Double Glazing in Grantham
- Slim Cavity Units in Grantham
- Secondary Glazing in Grantham
- Misted Unit Replacement in Grantham
Survey visits in Grantham are usually booked within a week. There is no charge for the survey and no obligation to proceed.
Made to size for Grantham
Every product below is manufactured to your dimensions.
Retrofit Double Glazing
Sealed units fitted into your existing timber sashes.
Learn more →Slim Cavity Units
Narrow-cavity glazing for conservation sightlines.
Learn more →Secondary Glazing
Independent internal glazing for heat and noise.
Learn more →Misted Unit Replacement
Failed sealed units swapped without a new window.
Learn more →Draught Sealing
Perimeter sealing on windows and external doors.
Learn more →Acoustic Glazing
Laminated and asymmetric units for noisy locations.
Learn more →Thermal Survey
Where the heat is actually going before you spend.
Learn more →Trickle Vents and Ventilation
Compliant background ventilation after sealing.
Learn more →What clients tell us
Feedback collected directly from completed projects. Full written references are available on request before you commit.
“The survey showed most of the loss was around the frames, not through the glass at all.”
Verified client, Lincolnshire“Half the cost of replacement and the rooms hold heat noticeably better.”
Verified client, Lincolnshire“They fitted trickle vents we had not thought about, which stopped the condensation.”
Verified client, LincolnshireGrantham questions
What if the opening is out of square?
Most older openings are. The survey records the actual dimensions at several points and the unit is manufactured to suit, which is the main reason we survey rather than work from the sizes given over the phone.
Will the finish need maintaining?
A factory-applied microporous finish typically needs inspection every three to five years, sooner on exposed coastal elevations. Maintaining it is far cheaper than letting a coating fail and the timber take up water.
Do you take a deposit?
Not before the measured survey. A deposit is only requested once the survey is complete and you have approved the final schedule and price.
Is the timber certified?
All our stock is FSC certified and chain-of-custody documentation is supplied with the order, which most main contractors and specifiers now require for their records.
How long does a typical order take?
Most made-to-size orders run six to ten weeks from survey to delivery. Conservation and heavily detailed work can take longer, and we confirm the lead time in writing at quotation rather than leaving it open.
Talk to us about your project
Free, no obligation, and a fixed figure in writing. We will tell you honestly if what you are asking for is not the right answer.
Request a quote Call 0800 088 6248