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TCM Building & Maintenance

Projects We're
Proud Of

Over 15 years of building and maintenance projects across London and Hertfordshire. Every project is delivered to the same standard — the one we'd want for our own homes.

500+
Projects Completed
15+
Years Experience
5.0★
Checkatrade Rating
Double-Storey Rear Extension
Featured
Extensions Walthamstow, E17

Double-Storey Rear Extension

A full double-storey rear extension on a Victorian terraced house, creating an open-plan kitchen-diner on the ground floor and a new master bedroom with en-suite above. Matching London stock brick throughout.

Planning permission secured
Matching stock brick
Structural steel frame
Bi-fold glazed doors
Duration
14 weeks
Project Value
£95,000
Location
Walthamstow, E17
Double-Storey Rear Extension
Extensions

Double-Storey Rear Extension

A full double-storey rear extension on a Victorian terraced house, creating an open-plan kitchen-diner on the ground floor and a new master bedroom with en-suite above. Matching London stock brick throughout.

Planning permission secured
Matching stock brick
Structural steel frame
Bi-fold glazed doors
Walthamstow, E17 14 weeks
£95,000
Single-Storey Kitchen Extension
Extensions

Single-Storey Kitchen Extension

A single-storey rear extension on a 1930s semi-detached house, creating a large open-plan kitchen-diner with bi-fold doors opening onto a landscaped garden.

Flat roof with rooflight
Bi-fold aluminium doors
Underfloor heating
Matching brickwork
Seven Kings, IG3 8 weeks
£42,000
Master Bedroom Loft Conversion
Loft Conversions

Master Bedroom Loft Conversion

A full Velux loft conversion on an Edwardian semi, creating a master bedroom with exposed painted beams, built-in wardrobes, and a private en-suite bathroom.

Velux roof windows
Exposed painted beams
Built-in wardrobes
En-suite bathroom
Newbury Park, IG2 10 weeks
£55,000
Full Kitchen Refurbishment
Refurbishments

Full Kitchen Refurbishment

A complete kitchen transformation in a Victorian semi — navy handleless units, quartz worktops, large-format porcelain tiles, and a bespoke island with brass pendant lighting.

Full structural alterations
Bespoke island unit
Quartz worktops
Underfloor heating
St Albans, AL1 5 weeks
£38,000
Commercial Office Fit-Out
Commercial

Commercial Office Fit-Out

A full commercial office fit-out for a growing technology company — open-plan layout, glazed partitions, bespoke timber joinery, polished concrete floors, and a statement reception.

2,400 sq ft floor plate
Glazed partition system
Bespoke joinery
Cat 6 data infrastructure
Tottenham, N17 12 weeks
£180,000
Home Cinema Basement Conversion
Basement Conversions

Home Cinema Basement Conversion

A full basement conversion beneath a Victorian terraced house, creating a luxurious home cinema and lounge. Full structural underpinning, Type C cavity drain waterproofing, and bespoke AV installation.

Structural underpinning
Type C waterproofing
Acoustic insulation
Bespoke AV system
Muswell Hill, N10 18 weeks
£120,000
Garage to Home Office Conversion
Garage Conversions

Garage to Home Office Conversion

A full integral garage conversion into a bright home office with a large roof lantern, bespoke built-in desk and shelving, engineered oak flooring, and full insulation to Building Regulations standard.

Roof lantern installed
Bespoke built-in joinery
Full insulation
Building Regs certificate
Harpenden, AL5 4 weeks
£22,000
Full Roof Replacement
Roofing

Full Roof Replacement

A complete roof replacement on a 1930s semi-detached house — new dark grey concrete interlocking tiles, new UPVC fascias and soffits, new lead flashing, and new guttering throughout.

Full tile replacement
New fascias & soffits
Lead flashing
25-year guarantee
Goodmayes, IG3 3 weeks
£14,500
Luxury Bathroom Renovation
Bathrooms

Luxury Bathroom Renovation

A complete luxury bathroom renovation — freestanding oval bath, walk-in rainfall shower, large-format marble-effect porcelain tiles, floating vanity unit, and brushed brass fixtures throughout.

Freestanding bath
Rainfall shower
Marble-effect tiles
Brushed brass fixtures
Radlett, WD7 3 weeks
£18,000
Garden Office Studio
Extensions

Garden Office Studio

A bespoke garden office studio — timber-clad structure with a mono-pitch roof, large aluminium sliding doors, built-in desk and shelving, full insulation, and mains electricity.

Timber cladding
Aluminium sliding doors
Mains electricity
Fully insulated
Elstree, WD6 6 weeks
£28,000
Timber Porch Canopy Build
Extensions

Timber Porch Canopy Build

A bespoke timber porch canopy built over a front door on a 1960s semi-detached house in Borehamwood. Structural joist frame, corbel support brackets, and a tiled pitched roof — all matching the existing property materials.

Structural joist frame
Corbel support brackets
Matching roof tiles
Completed in 3 days
Borehamwood, WD6 3 days
£2,800
Loft Conversion — Velux & PIR Insulation
Loft Conversions

Loft Conversion — Velux & PIR Insulation

A full loft conversion with Velux roof windows and 100mm PIR insulation boards installed between and over the rafters. The old mineral wool was stripped out entirely before new airtight insulation was fitted to current Building Regulations standard.

PIR insulation to Part L
Velux roof windows
Old insulation stripped
Airtight membrane
Hertfordshire 9 weeks
£48,000
Full Roof Retile — New Battens & Clay Tiles
Roofing

Full Roof Retile — New Battens & Clay Tiles

A complete re-roof on a detached house — all old tiles stripped, new treated timber battens fixed to the rafters, and new machine-made clay plain tiles laid in a staggered bond. Broken verge and ridge details repaired throughout.

Full strip and re-batten
Clay plain tiles
Verge & ridge repair
15-year workmanship guarantee
Hertfordshire 5 days
£9,500
Flat Roof Extension — OSB Deck & EPDM
Extensions

Flat Roof Extension — OSB Deck & EPDM

A single-storey flat roof extension with structural OSB decking installation shown mid-build. The deck is laid over insulated timber joists before the EPDM rubber membrane is applied — a method that delivers a 30-year life expectancy with zero maintenance.

Structural OSB decking
EPDM rubber membrane
30-year life expectancy
Insulated warm roof
Hertfordshire 4 weeks
£32,000
500+
Projects Completed
Across London & Hertfordshire
15+
Years Experience
Established 2009
£50M+
Work Delivered
Across all project types
5.0★
Checkatrade Rating
Based on verified reviews

From First Fix to Finished Build

These are photographs taken on our actual job sites in Borehamwood and Hertfordshire — not stock images. They show the standard of workmanship we bring to every project, at every stage.

Case Study

Timber Porch Canopy — Borehamwood, WD6

Timber corbel support brackets fixed to wall during porch canopy construction in Borehamwood
Stage 1 — Bracket Installation. Timber corbel support brackets fixed to the wall before the joist frame is assembled.
Structural timber joist frame installed for porch canopy over front door in Borehamwood WD6
Stage 2 — Joist Frame. Structural joist frame assembled and fixed — the skeleton of the canopy roof before tiling.
Completed timber porch canopy with tiled pitched roof over front door in Borehamwood
Stage 3 — Finished Canopy. Completed porch canopy with matching clay tiles, underside boarding, and painted finish.
Case Study

Roof Repair & Retile — Hertfordshire

Broken and slipped verge tiles on a pitched roof in Hertfordshire before repair
Before — Damaged Verge. Broken and slipped verge tiles allowing water ingress. A common failure point on older Hertfordshire properties.
Weathered gable verge tiles on a pitched roof in Hertfordshire showing age and mortar failure
Survey — Verge Condition. Weathered gable verge with failed mortar bed and cracked tiles — identified during our pre-works roof survey.
New treated timber battens and clay plain tiles laid during full roof retile in Hertfordshire
After — New Battens & Tiles. New treated timber battens and machine-made clay plain tiles laid in staggered bond. 15-year workmanship guarantee.

What Our Clients Say

"TCM transformed our Victorian terrace with a stunning double-storey extension. The quality of work is exceptional and they managed the entire project from planning to completion. We couldn't be happier."

SB
Sarah & Tom B.
Double-Storey Extension · Walthamstow, E17

"Our loft conversion was completed in just 10 weeks and the finish is outstanding. TCM were professional, tidy, and kept us informed throughout. The new master bedroom has completely transformed our home."

PM
Priya M.
Loft Conversion · Newbury Park, IG2

"The basement conversion is absolutely incredible. The structural work was immaculate, the waterproofing is flawless, and the cinema room is everything we dreamed of. Two years on and not a single issue."

MC
Michael C.
Basement Conversion · Muswell Hill, N10

Ready to Add Your Project
to Our Portfolio?

Contact our team today for a free, no-obligation site survey and quotation. We cover all areas of London and Hertfordshire.