GS Renovation builds loft conversions across Addiscombe, where the bay-fronted Victorian and Edwardian terraces running towards Lloyd Park still keep their original rear closet wings. That shape suits an L-shaped dormer better than anything else. We coordinate the structural engineer, build to the design and take Croydon Council building control through to sign-off.
What actually fits an Addiscombe terrace roof
Start with a tape measure rather than a mood board. Measure from the top of the existing ceiling joists to the underside of the ridge, and look for roughly 2.2m to 2.4m. Below that you are into lowering the bedroom ceilings underneath or lifting the roof, and both change the budget considerably. Plenty of CR0 terraces of this age have the height, and where the original closet wing survives at the back, an L-shaped dormer wraps the main rear slope into the wing and gives you a double bedroom with an en suite rather than one narrow room.
A rooflight conversion is cheaper if the ridge is generous and you want a study or spare room, because nothing is added to the roof outline. Indicative London ranges for 2026 put that at roughly £30,000 to £45,000, a straight rear dormer at roughly £45,000 to £65,000 and the L-shaped version at roughly £55,000 to £80,000. An en suite adds around £8,000 to £15,000 on top. We tell you which of those your roof genuinely supports once we have been up there.
Croydon Council consents and the shared wall
Many loft conversions proceed under permitted development, using the commonly cited allowances of 40 cubic metres of added volume on a terraced house and 50 on a semi-detached or detached one, subject to conditions: nothing forward of the existing roof plane, materials to match, no balconies or verandas, and side windows obscure glazed. Those rights do not exist on a listed building, inside a conservation area, or where Croydon Council has an Article 4 direction in force, so your address needs checking before anybody promises you a dormer.
Building regulations apply either way. Croydon building control will want a protected stair route with fire doors and interlinked alarms under Part B, a stair meeting Part K on rise, going and headroom, and a new floor on joists sized by the engineer and carried on steel bearing onto padstones, never sat on the old ceiling joists. Because your Addiscombe terrace shares a party wall on at least one side, cutting steel or a dormer cheek into it is notifiable. As building owner you serve that notice, and we prepare what sits behind it.
- New floor joists independent of the existing ceiling
- Structural steel sized by the engineer and set on padstones
- Ventilation paths kept clear at eaves and ridge
- Head height and ridge survey before design
- Rear dormers to win full head height across the new floor
Trusted Loft Conversion in Addiscombe
Addiscombe homeowners choose GS Renovation because one team carries the loft from first survey to certificate: the engineer's steelwork, Croydon Council building control, party wall paperwork, the stair, the en suite and the decoration. Founder Abdelaaziz Saaid brings 30+ years of hands-on structural work to CR0 roofs. Fully insured, with free no-obligation quotations and a dedicated project manager.
- Materials priced at options, so you choose the finish
- Water tank removed and the system converted where it blocks the space
- Staircase set out to Part K within the space you have
- A written scope and programme agreed before work starts
- Ridge height measured before any design work is commissioned
- Paperwork and certificates handed over for when you sell