Browse real UK project photos with indicative cost ranges for extensions, loft conversions and new builds — so you can see what your budget could achieve.
Showing 24 projects
StandardIndicative Cost
£44,800 – £61,600
Size
28 m²
Open-plan rear extension creating a bright kitchen-diner with bifold doors onto the garden. Brick-built with a flat roof lantern.
Indicative Cost
£38,880 – £53,460
Size
18 m²
Classic London side return infill extension maximising the narrow passage beside a Victorian terrace. Glazed roof brings natural light deep into the plan.
Indicative Cost
£73,500 – £115,500
Size
35 m²
Premium garden room extension with full-width sliding doors, vaulted ceiling with exposed timber beams, and high-end stone flooring throughout.
Indicative Cost
£63,000 – £86,100
Size
42 m²
Wraparound rear and side extension combining kitchen, dining and utility space. Flat roof with large rooflights and anthracite grey aluminium windows.
Indicative Cost
£50,400 – £79,200
Size
24 m²
Traditional orangery extension with brick pillars, a full-height glazed lantern roof and hardwood French doors. Seamlessly connects the living room to the garden.
Indicative Cost
£19,600 – £26,600
Size
14 m²
Practical single storey extension adding a utility room and boot room to a detached family home. Tiled floor, fitted storage and external door to the side passage.
Indicative Cost
£83,200 – £114,400
Size
52 m²
Full-width two storey rear extension adding a large kitchen-diner on the ground floor and a master bedroom with en-suite above. Brick-built to match the existing house.
Indicative Cost
£76,800 – £105,600
Size
48 m²
Two storey side extension on a detached house, adding a double garage with a bedroom and bathroom above. Rendered finish with slate roof to match the original.
Indicative Cost
£162,000 – £222,750
Size
60 m²
Striking contemporary two storey rear extension with full-height glazing on the ground floor and a cantilevered bedroom above. Zinc cladding and structural glass balustrade.
Indicative Cost
£98,000 – £134,400
Size
70 m²
L-shaped two storey extension wrapping around the rear and side of a 1930s semi. Ground floor adds open-plan living; upper floor adds two bedrooms and a family bathroom.
Indicative Cost
£150,400 – £206,400
Size
80 m²
Ambitious wraparound two storey extension transforming a modest semi into a spacious family home. Adds 80m² of living space across two floors with a roof terrace above the ground floor element.
Indicative Cost
£95,040 – £130,680
Size
44 m²
Two storey rear extension on a Victorian terrace, adding a kitchen extension and utility on the ground floor with a new bedroom and bathroom above. Stock brick to match.
Indicative Cost
£60,480 – £86,400
Size
32 m²
Classic rear dormer loft conversion creating a large double bedroom with en-suite. Full-width dormer to the rear with Velux windows to the front.
Indicative Cost
£71,440 – £102,220
Size
38 m²
Hip-to-gable conversion on a 1960s detached house, squaring off the roof to maximise usable floor space. Master bedroom suite with walk-in wardrobe and en-suite shower room.
Indicative Cost
£121,500 – £182,250
Size
45 m²
Full mansard conversion on a London mid-terrace, creating two bedrooms and a bathroom in the roof space. Near-vertical rear wall maximises headroom throughout.
Indicative Cost
£39,200 – £56,000
Size
28 m²
Budget-friendly Velux loft conversion keeping the existing roofline intact. Ideal for properties with good existing roof height. Creates a bright bedroom with two large Velux windows.
Indicative Cost
£94,000 – £134,500
Size
50 m²
L-shaped dormer conversion on a Victorian semi, combining a rear dormer with a side dormer to create two bedrooms and a bathroom. Popular choice for maximising space.
Indicative Cost
£108,000 – £162,000
Size
40 m²
Premium loft conversion with a private roof terrace accessed from the master bedroom. Juliet balcony to the rear dormer and a full terrace above the existing flat roof extension below.
Indicative Cost
£198,000 – £308,000
Size
110 m²
Traditional brick-built 3-bedroom detached house with integral garage. Standard specification with gas central heating, uPVC windows and a fitted kitchen.
Indicative Cost
£295,000 – £412,500
Size
125 m²
Contemporary white render 3-bedroom detached house with flat roof sections, large aluminium windows and an open-plan ground floor. Air source heat pump and underfloor heating.
Indicative Cost
£166,250 – £232,750
Size
95 m²
Timber frame 3-bedroom semi-detached house with a traditional slate roof and roughcast render. Highly insulated to meet Scottish Building Standards.
Indicative Cost
£292,500 – £455,000
Size
130 m²
Premium self-build eco house with SIPs panels, sedum roof, solar PV, MVHR ventilation and triple-glazed windows. Designed to achieve Passivhaus standard.
Indicative Cost
£193,200 – £268,800
Size
105 m²
Cottage-style 3-bedroom detached house built in local Yorkshire stone with a traditional slate roof. Designed to blend with the surrounding rural landscape.
Indicative Cost
£378,000 – £529,200
Size
140 m²
Premium 3-storey London townhouse with a basement level, roof terrace and high-end specification throughout. Brick and zinc cladding with floor-to-ceiling glazing.
All cost ranges shown are indicative figures based on current UK market rates (2026), adjusted for the stated region and specification level. They exclude VAT (typically 20%), professional fees (architect, structural engineer, planning), and any abnormal site conditions. Actual costs will vary depending on your specific project, site conditions, contractor, and local market. For an accurate cost plan, get a fee proposal or use our cost calculator.
These are indicative ranges. For a detailed, itemised cost plan specific to your drawings and location, our estimators will deliver a full estimate within 24 hours.
