Harrow · Greater London
Wall tie replacement in Harrow
The first clue to failing wall ties in Harrow is usually a crack pattern: fine horizontal lines every few courses on one elevation. We confirm what is happening inside the cavity with a metal detector and borescope before recommending any new ties.
Guide price from£2,250per house inc VAT
- Postcodes
- HA1, HA2, HA3, HA5, HA6
- Population
- about 260,000
- Area
- Greater London
- Pricing region
- London
Is Greater London prone to ground movement?
Harrow takes in postcode districts including HA1, HA2, HA3, HA5, HA6, with about 260,000 residents. Neighbouring towns we cover: Brent (3 miles), Ealing (5 miles) and Borehamwood (5 miles).
Greater London is one of the parts of the UK where clay soils are most likely to move with the seasons. Ground movement here is more often linked to soils, drains and trees than to mining. Housing stock in Greater London: Victorian and Edwardian terraces with shallow footings, inter-war semis in the outer boroughs, and converted flats and mansion blocks.
Which repair method suits a home in Harrow?
Remedial tie installation
New stainless ties are drilled through the outer leaf into the inner leaf, then fixed by mechanical expansion or resin, depending on the masonry. They are placed to a set grid across each elevation, with extra ties around openings and at the edges. Holes are made good in matching mortar.
Best for: Walls where the original ties have failed or are missing
Partial rebuild of the outer leaf
If a section of the outer leaf has bulged too far to be tied back, it is carefully taken down and rebuilt with new ties built in as the work goes up. This is uncommon, and is usually limited to a gable top, a parapet or a panel under a window.
Best for: Outer leaf too distorted to tie back safely
What happens when we carry out wall tie replacement in Harrow?
Tie survey
A metal detector locates the existing ties and shows their pattern. Small holes are then drilled at sample points and a borescope passed into the cavity to see the tie condition, type and embedment. The holes are made good afterwards.
Report and quote
You receive a written summary of what the survey found on each elevation, which walls need new ties, whether old ties should be isolated or removed, and a no-obligation written quote with scaffold shown separately.
Deal with the old ties and make good
Old ties are isolated or removed where the report calls for it, cracked joints are raked out and repointed, and drilled holes are filled in matching mortar. A written note of tie positions and findings goes in your property file.
Signs you may need wall tie replacement
- Mortar joints that look wider or opened up on one elevation
- Outer brickwork bowing or bulging, often worst near the top
- The roof edge or verge lifting slightly above the brickwork
How much will wall tie replacement cost in Harrow?
The ranges below reflect typical London costs for wall tie replacement, including VAT. Scaffold, access and making good can push a job to the top of the range.
| Item | Guide price | Per |
|---|---|---|
| Mid-terrace houseest. | £2,250 – £4,400 | per house |
| Semi-detached house | £3,100 – £6,250 | per house |
| Detached houseest. | £4,400 – £8,750 | per house |
| Scaffolding where neededest. | £750 – £2,250 | per elevation |
Rules for wall tie replacement in England
Like-for-like repairs such as crack stitching and repointing do not usually need building control approval in England, but anything that changes or strengthens the structure, such as underpinning or rebuilding a wall, does. If the work touches a party wall, the Party Wall etc. Act 1996 may apply.
Wall tie replacement in Harrow: questions and answers
How much will wall tie replacement cost in Harrow?
Guide prices for wall tie replacement in Harrow start from about £2,250 per house, including VAT, on London rates. Your fixed written price follows photos or a survey and depends on the extent of the work and access.
Do you cover Harrow?
Yes. We take enquiries from across Harrow, including HA1, HA2, HA3, HA5, and from nearby places such as Brent and Ealing. Send photos for a free initial view and we will tell you what happens next.
Is the ground in Greater London prone to subsidence?
Most of Greater London sits on London Clay, among the most shrinkage-prone ground in the UK, with river gravels along the Thames. Subsidence claims here are among the most frequent in the country, especially after dry summers and near street and garden trees. Only an investigation can say why a particular building has moved.
Will a mortgage lender accept wall tie replacement?
Lenders generally accept properly carried out tie replacement, but they may want to see the survey, the quote or a record of the completed work. If a valuation has flagged wall ties, a written report and itemised quote are usually what the lender or buyer needs next.
Do the old wall ties have to be removed?
Not always, because thin wire ties that cannot swell are usually left in place once new ties are fitted. Thicker ties that are still expanding and cracking the wall are isolated or removed so they stop causing damage. The survey decides which applies.
Other structural repairs in Harrow
- Concrete repairs
- Lintel replacement
- Bay window subsidence repairs
- Crack stitching
- Subsidence insurance claim repairs
Wall tie replacement near Harrow
Send photos of any horizontal cracking at your Harrow property and we will tell you whether a wall tie survey looks worthwhile.