Yes, in many cases. A sound original box frame may be retained while new sashes are fitted, helping preserve shutters and panelling around the opening. The survey should establish what can stay, what needs temporary removal or repair, and which surrounding finishes may need making good or repainting.
The box frame is the fixed timber structure built into the window opening. The sashes are the glazed sections that slide within it. Original shutters, their recesses and the surrounding panelling form part of the interior joinery around the window.
Why shutters and panelling matter when planning window work
Original internal shutters and panelling are often fitted closely around the window opening. Removing the full box frame may require some of this joinery to be dismantled. Its construction and fixings determine whether it can be removed and refitted successfully.
Borislav Čakarević of Repair A Sash explains that, in some period properties, dismantling and remaking complex shutter boxes and panelling can become a bigger job than replacing the window itself. Preserving sound surrounding joinery can therefore make a substantial difference to the scope and cost of the work.
In a listed building, original internal joinery may also be protected. Listing covers the whole building, and alterations affecting its special architectural or historic interest require listed building consent. Check the proposed work with the local planning authority, even if the box frame will remain. Our guide to sash window alterations in a conservation area or listed building explains the wider planning context.
When keeping the original box frame can help
The box frame and the moving sashes should be assessed separately. The sashes can deteriorate while the box remains suitable for repair and reuse. Where replacement sashes are appropriate, new sashes fitted into the existing box frame can reduce the work needed around the opening.
The survey needs to check the box’s condition and alignment, whether the proposed sashes will fit, and whether there is enough room for suitable counterweights. Glazing weight and sash dimensions can limit the specification. Sound, historically significant sashes may be better repaired than replaced solely to accommodate different glazing.
At a listed property near Portobello Road, the approved scheme required the original boxes to remain. Repair A Sash repaired and prepared them, then fitted new Accoya sashes with FINEO vacuum glazing. Borislav describes preparing the old boxes and achieving an accurate fit as the most demanding stage. Read the full case study of our Notting Hill sash window restoration.
What may still need removing, repairing or redecorating
Keeping the surrounding joinery does not necessarily mean leaving every part in place throughout the work. Access to the sashes may require beads, fittings or obstructing components to be removed and refitted. The survey should identify which elements need to move and how they will be refitted.
Where dismantling is necessary, the parts should be marked and recorded before removal. This follows SPAB’s guidance on repairing wood windows, which also recommends repairing frames in place where possible. Agree how the shutters and panelling will be protected before work starts.
The survey should check that the proposed sash profiles and fittings leave enough clearance for the shutters to open and close properly. Existing problems with shutter operation should also be recorded, so the scope of any adjustment or repair is clear.
Retained boxes may need cleaning, paint preparation, local repairs and fitting adjustments before new sashes can be installed. Repair A Sash’s new sashes arrive painted, but retained timber and surrounding finishes still need to be assessed. Making good may include repairs to plasterwork or timber surfaces disturbed around the opening, followed by painting where required.
When retaining the box frame may not be practical
Extensive decay or serious distortion can make retention impractical, although localised defects may still be repairable. If there is insufficient space for the proposed sashes or counterweights, the specification should be reviewed before deciding that the box frame must be replaced.
If the box frame cannot reasonably be repaired and reused, complete sash window replacement may be necessary. The survey should still establish whether the original shutters and panelling can be retained.
Some concealed defects become apparent only once work begins. If they are uncovered, the contractor should explain the additional work and agree any change to the quotation before proceeding.
What the quotation should say about the surrounding joinery
Ask for a written scope covering the surrounding joinery as well as the window. It should identify what will be retained, any planned removal and refitting, and who is responsible for repairs and finishing.
| Item to agree | Question the quotation should answer |
| Retained joinery | Which shutters, shutter linings and panels will be retained, and which can stay in place throughout the work? |
| Temporary removal and refitting | What needs removing for access, how will it be refitted and who will do the work? |
| Protection and recording | How will the joinery be protected, and will existing details and dismantled parts be recorded? |
| Box preparation and repairs | What work to the existing box frame is included? |
| Sash fittings and shutter clearance | What changes to beads or hardware are proposed, and will the shutters still operate correctly? |
| Making good | What repairs to plasterwork or surrounding timber are included, and who carries them out? |
| Painting and redecoration | Which surfaces will be painted, by whom, and what finish is included? |
| Additional work | How will concealed defects, extra work and any price changes be agreed? |
If you are planning window work in a London period home, discuss your windows and surrounding joinery with Repair A Sash to arrange a survey.
Frequently asked questions
Sometimes. Shutters that obstruct access may need temporary removal and refitting. The survey should establish what can stay in place and what needs to move.
They should, provided the sash design and fittings leave sufficient clearance. This needs checking before manufacture.
No. Retained timber may need preparation and painting, and nearby plasterwork or decoration may need making good. Agree who will complete these tasks and whether the quotation includes them.
No. It can save work where full removal would involve dismantling or remaking complex shutters and panelling. The overall cost depends on the repairs and preparation needed, so quotations should cover the same scope before costs are compared.
Reviewed by / sources
Technical review: Borislav Čakarević, Repair A Sash
Sources: Repair A Sash expert interview with Borislav Čakarević and project experience; Repair A Sash Notting Hill case study; Historic England: Listed Building Consent; Historic England: What Are Listed Buildings?; SPAB: Repair of Wood Windows.
