Window and Door Building Alterations in Northampton
Create new openings, widen or reduce existing ones, and convert windows to doors with our skilled builders and fitters. Safe, compliant work with a seamless finish.
Professional Alterations for Windows and Doors
We handle structural changes, brickwork, and final installation as one coordinated service. From new openings to conversions for patio, French, or bi-fold doors, our team delivers precise work that blends with the original build.
We specify lintels correctly, match brickwork and finishes, and ensure the end result is safe, compliant, and tidy.
- New Openings
- add windows or doors where you need more light or access
- Opening Reductions
- make apertures smaller to suit new layouts or designs
- Brick-ups and Infills
- close unused openings and match surrounding finishes
- Lintel Supply and Installation
- structural support sized and fitted for compliance
- Window to Door Conversions
- convert windows to patio, French, or bi-fold doors
- Porch and Conservatory Alterations
- adapt existing spaces with matched doors and trims
Why Choose Tommy’s Windows?
- Opening specialists
- New apertures, reductions, and conversions are set out and executed with precision and care.
- Structural know how
- We specify and install lintels correctly to maintain integrity and compliance.
- Seamless finishes
- Brickwork, mortar, reveals, and trims are matched so alterations blend with the original build.
- One team, start to finish
- Survey, building work, and the final window or door fitting are managed together to keep timelines tight.
- Guidance on permissions
- Clear advice for conservation areas and when Building Control involvement is required.
- Clean, considerate build
- Minimal disruption, responsible waste handling, and a tidy handover.
Frequently Asked Questions
Key points about permissions, structure, and timelines for alteration work.
Most alterations do not need planning permission. Listed buildings and conservation areas can differ. We will advise and help if approvals are required.
Often yes for new or widened openings. We specify and install the correct lintel to keep the structure safe and compliant.
Yes. We source suitable bricks and match mortar and trims so the alteration blends with the original build.
Simple conversions are often completed in one to two days. Larger changes may take longer. We provide clear timelines before work starts.
We protect surfaces, manage dust, and keep the site tidy. Waste is removed responsibly and we leave your home clean.
Yes. We manage survey, structural work, and the final window or door fitting as one coordinated service.
Transform Your Space with Professional Alterations
Open up rooms, add light, and improve access with safe, compliant building alterations by a local team you can trust.