Bērzs 20

Timber-frame sauna with a rest room and terrace

Interior design

Materials cost

€14,200 – €19,300

incl. VAT · labour not included

Floor area: 19.2 m²
Plot from: 15 × 17 m
Paperwork: no documents (small building)

Request a design Change materials in the calculator What the price includes

A garden sauna under 25 m² (a “small building” in Latvia) on screw piles: steam room with a wood-fired stove and two-tier benches, wash room with a shower and a bright rest room opening onto the terrace. Mono-pitch roof. Laid out to the LBN 231-15 stove and chimney rules. Well suited to self-build.

Technical datafootprint 24.0 m² · height ≈ 4.2 m · mono-pitch, 10°

Total floor area: 19.20 m²
Footprint: 24.00 m²
Height: ≈ 4.2 m
Room height: 2.20 m
Roof: mono-pitch, 10°
Minimum plot: 15.0 × 17.0 m

Construction

Timber frame 150, board cladding · U ≈ 0.25

board cladding, wind barrier, wool 150 in frame, vapour barrier

Mono-pitch rafters, profiled metal

See other options in the calculator.

Floor plan

Dimensions in mm

№	Room	m²
1	Rest room	10.30
2	Wash room	3.20
3	Steam room	5.70
	Total floor area	19.20

Where the money goes

incl. VAT

The biggest items are walls and floors and services. Click a stage to see its materials.

Foundation€1,000 – €1,400
Walls and floors€4,300 – €6,100
Roof€1,200 – €2,100
Windows and doors€2,200 – €3,300
Services€2,200 – €3,500
Finishes€1,700 – €2,700
Delivery€600 – €1,100

Materials total: €14,200 – €19,300
Recommended contingency 10 %: +€1,400 – €1,900
Per m²: €740 – €1,005

Demo

Demo prices: the price database is still being checked against supplier and contractor quotes.

Not included: construction labour, plot, design and approvals, utility connections, landscaping, furniture and kitchen appliances. Prices as of 2026-09. How we estimate

Detailed estimate25 lines with quantities from the model

Item	Qty	Materials
Screw pile with head plate	9 pcs	€970 – €1,420
Insulated timber joist floor	20.0 m²	€840 – €1,460
Timber frame 150, board cladding	54.0 m²	€2,290 – €3,600
Stud partition 95	11.5 m²	€150 – €220
Insulated ceiling, 200 joists with wool	20.0 m²	€410 – €610
Attic door in the gable with a portable ladder	1 pcs	€240 – €610
Mono-pitch rafters, profiled metal	34.2 m²	€1,200 – €2,080
Timber windows, double glazing	3.6 m²	€790 – €1,300
Entrance door, insulated, no glass	1 pcs	€450 – €900
Entrance canopy	1 pcs	€260 – €700
Glass sauna door	1 pcs	€300 – €400
Interior door	1 pcs	€150 – €320
Electric convector with thermostat	2 pcs	€90 – €230
Air valve with a duct through the wall	3 pcs	€70 – €150
Exhaust fan with humidity sensor	1 pcs	€60 – €130
Electric water heater, connected	1 pcs	€110 – €180
Floor drain with its branch pipe	1 pcs	€20 – €60
Distribution board with residual current protection	1 pcs	€90 – €180
Electrical installation of a small building (certified electrician)	19.2 m²	€190 – €380
Wash and steam room floor: waterproofing and tiles	8.9 m²	€400 – €770
Wood-fired sauna stove with chimney	1 pcs	€1,020 – €1,950
Sauna water supply and drainage	1 pcs	€230 – €540
Timber lining of walls and ceilings	75.5 m²	€1,000 – €1,710
Sauna benches	1 pcs	€150 – €350
Delivery and offcut disposal	1 pcs	€630 – €1,110
Materials total incl. VAT		€14,200 – €19,300
With contingency		€15,600 – €21,200

Quantities from the Revit model v0.2: external walls 54.0 m², roof 34.2 m², windows 3.60 m².

Documents and details

PermitsLV building group (indicative): I · no documents (small building)

In Latvia a single-storey building with a footprint up to 25 m² is a “small building” (mazēka). Outside towns, and in towns on plots where a one- or two-apartment house is allowed, it needs no design documents at all. To register it in the cadastre and land register, file a construction notice in BIS. The relief does not apply in state-protected cultural monument areas. A terrace or porch built at ground level does not count towards the footprint. Distances to the boundary, plot coverage and other rules are set by the municipality’s land-use and building regulations. Check them with your local building board.

Rules checked 25.10.2026: Vispārīgie būvnoteikumi, Ēku būvnoteikumi, Būvniecības likums.

A pre-project is not permit documentation.

Drawings13 sheets · AR, BK, AVK, ŪK, EL · PDF A3

Architecture

BK · Structure · in Latvian

AVK · Heating and ventilation · in Latvian

AVK-1Ventilācijas un apkures plāns. Siltuma zudumiPDF

ŪK · Water and drainage · in Latvian

ŪK-1Ūdensapgādes un kanalizācijas plāns. AksonometrijaPDF

EL · Electrical · in Latvian

EL-1Elektroapgādes plāns. SS-1 shēmaPDF

Bill of materials101 items by construction stage

Quantity To order In the model

1Foundation3 items€1,000 – €1,400

No.	Material	Unit	OrderModel
Screw piles and grillage
1	Screw piles Ø89, L 2300, head 200×200P-1model: under the building	pcs	99
2	Pile grillage 2×50×200 C24, treatedfrom the frame model: pile rows, 2 boards · +10 %	m	33.030.0
3	M12 bolts with nuts for the pile headsP-12 per pile head	pcs	1818

2Walls and floors24 items€4,300 – €6,100

No.	Material	Unit	OrderModel
External walls ĀS-1
4	Siberian larch cladding boards 22×140ĀS-1net wall area · +10 %	m²	59.454.0
5	Battens 25×50, softwoodĀS-1horizontal, 600 centres · +10 %	m	99.089.9
6	Wind barrier membraneĀS-1+ laps · +15 %	m²	62.154.0
7	Facade oil for larch, 2 coatsĀS-10.1 l/m² × 2, part of the cladding	l	10.810.8
8	Frame C24 45×145 (studs, plates, noggins)ĀS-1from the frame model: studs at ≤ 600, opening studs, plates · +10 %	m	217.9198.1
9	Headers C24 2×45×195ĀS-1from the frame model, 2 boards · +10 %	m	12.511.3
10	Stone wool 150 mm, λD 0.035ĀS-1heated part, floor to top of the ceiling insulation, 39.6 m² × 88 % (frame excluded) · +5 %	m²	36.634.8
11	Vapour barrier membraneĀS-1heated part + laps · +15 %	m²	45.539.6
Partitions IS-1
12	Frame C24 45×95IS-1from the frame model: studs, plates · +10 %	m	53.748.7
13	Headers C24 2×45×195IS-1from the frame model, 2 boards · +10 %	m	3.53.2
14	Stone wool 95/100 mmIS-188 % of the area · +5 %	m²	10.710.1
Floor GR-1
15	Floorboards 28 mmGR-1+10 %	m²	22.120.0
16	Vapour barrier membraneGR-1+15 %	m²	23.120.0
17	Floor joists C24 50×200GR-1from the frame model: ≤ 600 centres + rim joists · +10 %	m	52.447.6
18	Stone wool 200 mmGR-190 % of the area; 3.60 m³ · +5 %	m²	19.018.0
19	Wind barrier membraneGR-1under the joists · +15 %	m²	23.120.0
20	Underside boards 22 mm, treatedGR-1+10 %	m²	22.120.0
Ceiling PR-1
21	Attic door in the gable 600×400, timber, with frame, hinges and lockBD-1model (BD-1)	pcs	11
22	Header over the attic door 2 × 45×195BD-12 × (opening + 2 × 50) · +10 %	m	1.61.4
23	Portable ladder, aluminium, extendingBD-1sill +3.00 above the ground	pcs	11
24	Ceiling joists C24 50×200PR-1from the frame model: ≤ 600 centres + rims + trimmers round the chimney · +10 %	m	57.952.6
25	Stone wool 200 mmPR-190 % of the area · +5 %	m²	19.018.0
26	Wind barrier membranePR-1over the wool · +15 %	m²	23.120.0
Frame fixings
27	Nails, screws, brackets, perforated straps~3 % of the frame timber value	set	11

3Roof17 items€1,200 – €2,100

No.	Material	Unit	OrderModel
Roof covering J-1
28	Profiled steel sheet, polymer coatedJ-1roof area on the slope · +10 %	m²	37.634.2
29	Sheet-metal verge, eave and top flashingsJ-1roof perimeter · +10 %	m	25.823.4
30	Gutter Ø125 with brackets, RAL 7016J-1north eaves; fall 3 ‰ · +10 %	m	6.35.7
31	Downpipes Ø90 with bendsJ-11 pcs · +10 %	m	3.73.3
32	Eaves vent strip with insect meshJ-1north eaves; 10,000 mm²/m	m	5.85.8
33	Top edge vent profile with meshJ-1south top edge; 10,000 mm²/m	m	5.85.8
34	Roofing screws 4.8×35 with EPDM washerJ-17 pcs/m² · +10 %	pcs	264239
35	Battens 32×100J-1350 centres · +10 %	m	107.497.6
36	Counter battens 25×50J-1along the rafters · +10 %	m	70.964.5
37	Breathable roof membraneJ-1+15 %	m²	39.334.2
Rafters
38	Rafters C24 50×200S-1from the rafter plan · +10 %	m	58.453.0
39	Double rafters C24 2×50×200S-2from the rafter plan, 2 boards · +10 %	m	26.023.6
40	Cut rafters C24 50×200S-3from the rafter plan · +10 %	m	5.34.8
41	Trimmers C24 2×50×200Š-1from the rafter plan, 2 boards · +10 %	m	4.13.6
42	Wall plates C24 2×50×150M-1from the rafter plan, 2 boards · +10 %	m	21.619.6
43	Fascia boards 25×200V-1from the rafter plan · +10 %	m	25.923.5
44	Rafter fixing bracketsBK-1at every rafter bearing	pcs	3030

4Windows and doors8 items€2,200 – €3,300

No.	Material	Unit	OrderModel
Windows, doors, trims
45	Timber windows, double glazed, two casements (1500×1200, 900×1200)L-1/L-2	pcs	22
46	Timber windows, double glazed, fixed 600×600L-3	pcs	22
47	Internal door, timber, moisture resistant 700×2000D-2	pcs	11
48	Sauna door, 8 mm tempered glass 700×1900D-3	pcs	11
49	Entrance canopy 1600×1200: timber frame, OSB, standing seam RAL 7016, steel brackets, drip edge, anchorsJT-1model (JT-1)	pcs	11
50	Entrance door, steel, insulated, no glass, thermally broken 900×2100D-1U ≤ 1.0	pcs	11
51	Opening trims 20×70 (inside and out)window and door perimeter × 2 · +10 %	m	66.360.2
52	Fitting foam, sealing tapesall openings	set	11

5Services35 items€2,200 – €3,500

No.	Material	Unit	OrderModel
Stove and chimney
53	Wood-fired sauna stove (steam room ~12.5 m³)K-1size from the maker's table	pcs	11
54	Insulated chimney Ø150/250, stainlessK-1from the stove to +5.35 m	m	4.64.5
55	Chimney passages (ceiling, roof) and roof flashingK-1certified	set	11
56	Non-combustible floor plate under the stove 900×750K-1LBN 231-15	pcs	11
57	Sauna stonesK-1per the stove maker	kg	4040
Water and sewer
58	PE-X 20 pipe, cold waterŪK-1model, to 2.2 m outside · +10 %	m	4.74.2
59	PE 32 PN10 water pipe (entry)ŪK-1model, to 2.2 m outside · +10 %	m	4.44.0
60	PE-X 20 pipe, hot waterŪK-1model, to 2.2 m outside · +10 %	m	4.64.1
61	PVC 50 sewer pipeŪK-1model, to 2.2 m outside · +10 %	m	5.14.6
62	PVC 110 sewer pipeŪK-1model, to 2.2 m outside · +10 %	m	4.13.7
63	Elbows and teesŪK-111 elbows + 2 tees	pcs	1616
64	Insulated sleeve for the entry with self-regulating heat cableŪK-1from the trench to the floor	m	1.81.8
65	Pipe insulation 13 mmŪK-1PE-X pipes · +10 %	m	9.28.3
66	Electric water heater 30 l, 1.5 kW, with safety valveŪS-1	pcs	11
67	Shower set with mixer and DN50 drainS-1	pcs	11
68	Floor drain DN50 in the steam roomTR-1	pcs	11
69	Drain and shut-off valvesŪK-1at the entry and ŪS-1	pcs	33
70	Air admittance valve for the sewerVV-1model, above the outlet	pcs	11
Ventilation and heating
71	Air valve Ø100 with damper and wall ductV-1	pcs	33
72	Exhaust fan Ø100 with humidity sensorV-2	pcs	11
73	Electric convector 1000 W with thermostatEK-1	pcs	11
74	Electric convector 500 W with thermostat, IPX4EK-2	pcs	11
75	External grilles Ø100 with insect meshAVK-1one per valve	pcs	44
Electrical
76	Board SS-1 (main switch 40 A, RCD 40 A/30 mA, 6 MCBs)SS-1	pcs	11
77	Cable Cu 3×1.5 mm²EL-1C1, C6: from SS-1 along the walls ×1.2 · +15 %	m	36.131.4
78	Cable Cu 3×2.5 mm²EL-1C2–C5: from SS-1 along the walls ×1.2 · +15 %	m	38.333.3
79	Heat-resistant silicone cable 3×1.5 (steam room)EL-1for luminaire G-2 · +15 %	m	3.53.0
80	LED ceiling luminaire, IP44G-1	pcs	22
81	Sauna luminaire 125 °C, IP54G-2	pcs	11
82	Outdoor wall luminaire LED, IP44G-3	pcs	11
83	Switches (1- and 3-gang)S	pcs	22
84	Double socketsK-2	pcs	22
85	Outdoor socket IP44K IP44	pcs	11
86	Stand-alone smoke detectorDD	pcs	11
87	Feeder cable Cu 3×6 mm² with Ø50 ductEL-1assumed 20 m from the house board · +15 %	m	23.020.0

6Finishes9 items€1,700 – €2,700

No.	Material	Unit	OrderModel
Interior lining
88	Spruce lining boards 15 mm: wallsĀS-1/IS-1room perimeters × 2.20 m − openings · +10 %	m²	61.756.0
89	Spruce lining boards 15 mm: ceilingsPR-1room areas · +10 %	m²	21.219.2
90	Sauna aluminium foilIS-1/PR-1IS-1 wet side + PR-1 ceiling · +15 %	m²	36.331.5
Steam and wash room
91	Two-tier benches, aspen (boards 28×90, supports)L-12.0 m	set	11
92	Wash and steam room: waterproofingGS-2GS-2 floor + 200 mm up the walls · +10 %	m²	13.612.3
93	Wash and steam room: floor tilesGS-2GS-2 from the model · +10 %	m²	9.88.9
94	Fibre cement boards for the floor under the tiles 12 mmGS-2on the floorboards, GS-2 (no gypsum: steam room) · +10 %	m²	9.88.9
95	Floor duckboard in the steam room, aspen 28×90GS-260 % of the floor (not under the benches) · +10 %	m²	3.83.4
96	Sauna wax/oil for the lining (steam and wash room)0.08 l/m²	l	3.73.7

7External works5 itemsoptional in the estimate

No.	Material	Unit	OrderModel
Terrace T-1
97	Screw piles Ø89 for the terraceP-1model	pcs	33
98	Larch decking 28×145T-1+10 %	m²	9.99.0
99	Terrace joists C24 45×145, treatedT-1from the frame model: ≤ 500 centres + rims · +10 %	m	31.728.8
100	Terrace beams 2×50×200 C24, treatedT-1from the frame model: on the piles, 2 boards · +10 %	m	22.020.0
101	Decking screws A2 4.5×50T-12 screws at every joist, 27 pcs/m² · +10 %	pcs	268243

ΣGeneral list85 items

The same material from every stage summed into one order line, e.g. C24 50×200 for the floor and ceiling joists and the rafters. The order is rounded up from the sum.

No.	Material	Unit	OrderModel
1	Screw piles Ø89, L 2300, head 200×2001 7 rows 1, 97	pcs	1212
2	Timber C24 50×200, treated1 7 rows 2, 100 · +10 %	m	55.050.0
3	M12 bolts with nuts for the pile heads1	pcs	1818
4	Siberian larch cladding boards 22×1402 · +10 %	m²	59.454.0
5	Battens 25×502 3 rows 5, 36 · +10 %	m	169.9154.4
6	Wind barrier membrane2 rows 6, 19, 26 · +15 %	m²	108.294.0
7	Facade oil for larch, 2 coats2	l	10.810.8
8	Timber C24 45×1452 · +10 %	m	217.9198.1
9	Timber C24 45×1952 rows 9, 13, 22 · +10 %	m	17.515.8
10	Stone wool 150 mm, λD 0.0352 · +5 %	m²	36.634.8
11	Vapour barrier membrane2 rows 11, 16 · +15 %	m²	68.659.6
12	Timber C24 45×952 · +10 %	m	53.748.7
13	Stone wool 95/100 mm2 · +5 %	m²	10.710.1
14	Floorboards 28 mm2 · +10 %	m²	22.120.0
15	Timber C24 50×2002 3 rows 17, 24, 38, 39, 40, 41 · +10 %	m	203.8185.3
16	Stone wool 200 mm2 rows 18, 25 · +5 %	m²	37.936.0
17	Underside boards 22 mm, treated2 · +10 %	m²	22.120.0
18	Attic door in the gable 600×400, timber, with frame, hinges and lock2	pcs	11
19	Portable ladder, aluminium, extending2	pcs	11
20	Nails, screws, brackets, perforated straps2	set	11
21	Profiled steel sheet, polymer coated3 · +10 %	m²	37.634.2
22	Sheet-metal verge, eave and top flashings3 · +10 %	m	25.823.4
23	Gutter Ø125 with brackets, RAL 70163 · +10 %	m	6.35.7
24	Downpipes Ø90 with bends3 · +10 %	m	3.73.3
25	Eaves vent strip with insect mesh3	m	5.85.8
26	Top edge vent profile with mesh3	m	5.85.8
27	Roofing screws 4.8×35 with EPDM washer3 · +10 %	pcs	264239
28	Battens 32×1003 · +10 %	m	107.497.6
29	Breathable roof membrane3 · +15 %	m²	39.334.2
30	Timber C24 50×1503 · +10 %	m	21.619.6
31	Fascia boards 25×2003 · +10 %	m	25.923.5
32	Rafter fixing brackets3	pcs	3030
33	Timber windows, double glazed, two casements (1500×1200, 900×1200)4	pcs	22
34	Timber windows, double glazed, fixed 600×6004	pcs	22
35	Internal door, timber, moisture resistant 700×20004	pcs	11
36	Sauna door, 8 mm tempered glass 700×19004	pcs	11
37	Entrance canopy 1600×1200: timber frame, OSB, standing seam RAL 7016, steel brackets, drip edge, anchors4	pcs	11
38	Entrance door, steel, insulated, no glass, thermally broken 900×21004	pcs	11
39	Opening trims 20×70 (inside and out)4 · +10 %	m	66.360.2
40	Fitting foam, sealing tapes4	set	11
41	Wood-fired sauna stove (steam room ~12.5 m³)5	pcs	11
42	Insulated chimney Ø150/250, stainless5	m	4.64.5
43	Chimney passages (ceiling, roof) and roof flashing5	set	11
44	Non-combustible floor plate under the stove 900×7505	pcs	11
45	Sauna stones5	kg	4040
46	PE-X 20 pipe5 rows 58, 60 · +10 %	m	9.28.3
47	PE 32 PN10 water pipe (entry)5 · +10 %	m	4.44.0
48	PVC 50 sewer pipe5 · +10 %	m	5.14.6
49	PVC 110 sewer pipe5 · +10 %	m	4.13.7
50	Elbows and tees5	pcs	1616
51	Insulated sleeve for the entry with self-regulating heat cable5	m	1.81.8
52	Pipe insulation 13 mm5 · +10 %	m	9.28.3
53	Electric water heater 30 l, 1.5 kW, with safety valve5	pcs	11
54	Shower set with mixer and DN50 drain5	pcs	11
55	Floor drain DN50 in the steam room5	pcs	11
56	Drain and shut-off valves5	pcs	33
57	Air admittance valve for the sewer5	pcs	11
58	Air valve Ø100 with damper and wall duct5	pcs	33
59	Exhaust fan Ø100 with humidity sensor5	pcs	11
60	Electric convector 1000 W with thermostat5	pcs	11
61	Electric convector 500 W with thermostat, IPX45	pcs	11
62	External grilles Ø100 with insect mesh5	pcs	44
63	Board SS-1 (main switch 40 A, RCD 40 A/30 mA, 6 MCBs)5	pcs	11
64	Cable Cu 3×1.5 mm²5 · +15 %	m	36.131.4
65	Cable Cu 3×2.5 mm²5 · +15 %	m	38.333.3
66	Heat-resistant silicone cable 3×1.5 (steam room)5 · +15 %	m	3.53.0
67	LED ceiling luminaire, IP445	pcs	22
68	Sauna luminaire 125 °C, IP545	pcs	11
69	Outdoor wall luminaire LED, IP445	pcs	11
70	Switches (1- and 3-gang)5	pcs	22
71	Double sockets5	pcs	22
72	Outdoor socket IP445	pcs	11
73	Stand-alone smoke detector5	pcs	11
74	Feeder cable Cu 3×6 mm² with Ø50 duct5 · +15 %	m	23.020.0
75	Spruce lining boards 15 mm6 rows 88, 89 · +10 %	m²	82.875.2
76	Sauna aluminium foil6 · +15 %	m²	36.331.5
77	Two-tier benches, aspen (boards 28×90, supports)6	set	11
78	Wash and steam room: waterproofing6 · +10 %	m²	13.612.3
79	Wash and steam room: floor tiles6 · +10 %	m²	9.88.9
80	Fibre cement boards for the floor under the tiles 12 mm6 · +10 %	m²	9.88.9
81	Floor duckboard in the steam room, aspen 28×906 · +10 %	m²	3.83.4
82	Sauna wax/oil for the lining (steam and wash room)6	l	3.73.7
83	Larch decking 28×1457 · +10 %	m²	9.99.0
84	Timber C24 45×145, treated7 · +10 %	m	31.728.8
85	Decking screws A2 4.5×507 · +10 %	pcs	268243

Quantities from the Revit model v0.2, stages as in the estimate. To order = model + waste for cutting and laps. Pre-project level: check with the builder before ordering.

By stage:CSV PDFGeneral:CSV PDF

What next

incl. VAT

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